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    <img src="https://asxresearch.org/images/f/f5/TFR_190_x_82.png"
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        alt="TFRs">
 
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        TFRs
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<img src="https://asxresearch.org/images/5/5f/177th_F-16_trans_300.png"
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     <b>▶ Temporary Flight Restrictions (TFRs)</b> are regulatory airspace restrictions established for a specific area and period of time to protect persons or property in the air or on the surface, provide a safe environment for disaster relief and emergency operations, protect certain governmental or public activities, or address other temporary hazards and security requirements. TFRs may be issued for wildfires, disaster areas, major public events, VIP movements, space operations, air shows, security events, and other circumstances requiring temporary control of the airspace. Because TFRs can be established or changed rapidly, pilots must specifically check for applicable TFRs during preflight planning and remain aware of changes that may occur after departure. <b><span style="color:#B00000; font-weight:bold;">ENTERING AN ACTIVE TFR WITHOUT AUTHORIZATION CAN CREATE A SERIOUS FLIGHT-SAFETY HAZARD and may result in interception, enforcement action, certificate sanctions, or other consequences.</span></b> A TFR should never be treated as merely another item in a briefing; its location, dimensions, altitude limits, effective times, operating restrictions, and authorization requirements must be understood before operating anywhere near the affected airspace.
  </div>
 
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        FAA Active &amp; Future Temporary Flight Restrictions (TFRs)
      </b>
    </div>
 
    <div style="
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      Live TFR information supplied by the Federal Aviation Administration.
      Always verify TFR and NOTAM information with official FAA sources before flight.
      <b>This is a live feed from the FAA.</b>&nbsp;<i><span style="color:#0050e2;">Scroll window below for current data:</span></i>
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        src="/tfr7.php"
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        alt="TFRs">
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        NOTAMs
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<img src="https://asxresearch.org/images/e/e7/X_runway.jpg"
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    alt="TFRs">


<div style="max-width:800px; min-width:150px; width:100%; overflow-x:auto;">
{| class="wikitable"
! style="min-width:90px;" | Date !! style="min-width:110px;" | Subject !! Linked Article !! style="min-width:105px;" | Author(s) !! style="min-width:85px;" | Institution !! | Ind.
|-
! colspan="6" style="background:#f0f0f0; text-align:left;" | 2026
|-
| 31 Aug. 2026 || Artificial Intelligence || [https://asxresearch.org/index.php?title=Erosion_of_the_Human_Safety_Margin Erosion of the Human Safety Margin] || Clark, Albert N. || ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 30 Aug. 2026 || Artificial Intelligence || [https://asxresearch.org/index.php?title=The_Autonomous_Flight_Deck The Autonomous Flight Deck] || Clark, Albert N. || ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 29 Aug. 2026 || Artificial Intelligence || [https://asxresearch.org/index.php?title=AI_as_an_Aviation_Safety_Decision_Maker AI as an Aviation Safety Decision Maker] || Clark, Albert N. || ASX Research Journal and Database ||<div style="text-align:center;">[[File:ResearchGate.png|24px]]</div>
|-
| 26 Aug. 2026 || Artificial Intelligence || [https://asxresearch.org/index.php?title=AI_Certification_for_the_NAS AI Certification for the NAS] || Clark, Albert N. || ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
|-
! colspan="6" style="background:#f0f0f0; text-align:left;" | 2025
|-
| 27 June 2025 || Flight Safety || [https://asxresearch.org/index.php?title=The_Potomac_River_Air_Tragedy:_Inside_the_Special_Flight_Rules_Area_(SFRA)_Failure The Potomac River Air Tragedy: Inside the Special Flight Rules Area (SFRA) Failure] || Clark, Albert N. || Everglades University, ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 17 June 2025 || Flight Safety || [https://asxresearch.org/index.php?title=Balancing_Automation_and_Human_Expertise:_A_Comprehensive_Approach_to_the_Future_of_Air_Safety Balancing Automation and Human Expertise: A Comprehensive Approach to the Future of Air Safety] || Clark, Albert N. || Everglades University, ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 27 April 2025 || Flight Simulation || [https://asxresearch.org/index.php?title=Next-Gen_Flight_Education:_MSFS_and_the_Future_of_Simulation-Based_Pilot_Training Next-Gen Flight Education: MSFS and the Future of Simulation-Based Pilot Training] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||<div style="text-align:center;">[[File:ResearchGate.png|24px]]</div>
|-
| 01 March 2025 || Global Supply Chain Logistics || [https://asxresearch.org/index.php?title=Global_Supply_Chain_Logistics:_Strategies,_Challenges,_and_the_Future_of_International_Trade Global Supply Chain Logistics: Strategies, Challenges, and the Future of International Trade] || Clark, Albert N. || Everglades University, ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
! colspan="6" style="background:#f0f0f0; text-align:left;" | 2024
|-
| 08 Dec. 2024 || Aircraft Systems || [https://asxresearch.org/index.php?title=From_Levers_to_Glass:_The_Evolution_of_Aircraft_Cockpits_and_the_Future_of_Aviation_Innovation From Levers to Glass: The Evolution of Aircraft Cockpits and the Future of Aviation Innovation] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||<div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 25 Aug. 2024 || Navigation Systems || [https://asxresearch.org/index.php?title=ADS-B:_Advancements_in_Air_Traffic_Management ADS-B: Advancements in Air Traffic Management] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||
|-
| 23 June 2024 || UAVs || [https://asxresearch.org/index.php?title=The_Advent_and_Use_of_Drones_in_Public_Use_Airspace The Advent and Use of Drones in Public Use Airspace] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||
|-
| 02 June 2024 || World History || [https://asxresearch.org/index.php?title=The_Impact_of_World_War_II_and_the_Establishment_of_Israel The Impact of World War II and the Establishment of Israel] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||
|-
! colspan="6" style="background:#f0f0f0; text-align:left;" | 2023
|-
| 17 Dec. 2023 || Flight Safety - Airport || [https://asxresearch.org/index.php?title=Advancements_in_Airport_Lighting:_Illuminating_the_Path_of_Modern_Aviation Advancements in Airport Lighting: Illuminating the Path of Modern Aviation] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||
|-
| 12 Nov. 2023 || Emergency Management || [https://asxresearch.org/index.php?title=Challenges_Facing_Emergency_Management_in_the_Future Challenges Facing Emergency Management in the Future] || Clark, Albert N. || Everglades University, ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 22 Oct. 2023 || Emergency Management || [https://asxresearch.org/index.php?title=Overcoming_Communication_and_Coordination_Challenges:_Vital_Considerations_for_Response_and_Recovery Overcoming Communication and Coordination Challenges: Vital Considerations for Response and Recovery] || Clark, Albert N. || Everglades University, ASX Research Journal and Database ||<div style="text-align:center;">[[File:ResearchGate.png|24px]]</div>
|-
! colspan="6" style="background:#f0f0f0; text-align:left;" | 2021
|-
| 15 June 2021 || Space Travel || [https://asxresearch.org/index.php?title=One_Giant_Sale_for_Mankind:_Armstrong%E2%80%99s_Moon_Mission_Companions_Auctioned One Giant Sale for Mankind: Armstrong’s Moon Mission Companions Auctioned] || Clark, Albert N. || The Aviationist, ASX Research Journal and Database || <div style="text-align:center;">[[File:Google Scholar Icon.png|26px]]<br clear="all" />[[File:ResearchGate.png|24px]]</div>
|-
| 21 May 2021 || Meteorology || [https://asxresearch.org/index.php?title=NOAA_Hurricane_Hunters NOAA Hurricane Hunters] || Clark, Albert N. || The Aviationist, ASX Research Journal and Database ||<div style="text-align:center;">[[File:ResearchGate.png|24px]]</div>
|-
! colspan="6" style="background:#f0f0f0; text-align:left;" | 2018
|-
| 01 Nov. 2018 || Flight Safety - Aircrew || [https://asxresearch.org/index.php?title=The_Impossible_Turn The Impossible Turn] || FAA Safety Team || FAA ||<div style="text-align:center;">[[File:FAA logo.png|28px]]</div>
|}
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     <b>▶ FAA: Notice to Airmen (NOTAM)</b> — a notice containing time-critical information concerning the establishment, condition, or change of a facility, service, procedure, or hazard within the National Airspace System (NAS). Thorough review of applicable NOTAMs is a critical part of preflight planning and continued situational awareness. Runway closures, navigation outages, lighting failures, airspace restrictions, obstacles, and other hazards may not be apparent without consulting current NOTAM information. <b><span style="color:#B00000; font-weight:bold;">FATAL ACCIDENTS DO OCCUR when critical NOTAM information is missed, misunderstood, or inadequately incorporated into flight planning.</span></b> Pilots should know where to obtain authoritative NOTAM information, review it before every flight, and remain alert for changes throughout the operation.
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            Please Support <i>Open-Access</i> Aviation Safety Research
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<b>▶ NOTAM Acronyms</b>
__TOC__
== A ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''A''' Absolute<br>
<br>
'''A''' Alaskan Standard Time<br>
<br>
'''A''' Amber<br>
<br>
'''A''' Arctic (air mass)<br>
<br>
'''A/A''' Air to Air<br>
<br>
'''A/C''' Approach Control<br>
<br>
'''A/G''' Air to Ground<br>
<br>
'''A/H''' Already Had<br>
<br>
'''AAC''' Alaskan Air Command<br>
<br>
'''AAD''' Assigned Altitude Deviation<br>
<br>
'''AADC''' Approach and Departure Control<br>
<br>
'''AAF''' Army Air Field<br>
<br>
'''AAITVL''' Arrival Aircraft Interval<br>
<br>
'''AAL''' Above Aerodrome Level<br>
<br>
'''AAL''' Alaskan Region<br>
<br>
'''AAP''' Advise if Able to Proceed<br>
<br>
'''AAR''' Airport Arrival Rate<br>
<br>
'''AARTE''' Airport Acceptance Rate<br>
<br>
'''AATM''' At All Times<br>
<br>
'''AAWF''' Auxiliary Aviation Weather Facility<br>
<br>
'''AAWTA''' Advise at What Time Able<br>
<br>
'''AB''' Airborne<br>
<br>
'''ABBR''' Abbreviate<br>
<br>
'''ABCST''' Automatic Broadcast<br>
<br>
'''ABD''' Aboard<br>
<br>
'''ABI''' Advance Boundary Information<br>
<br>
'''ABLCHG''' Airborne Launching<br>
<br>
'''ABM''' Abeam<br>
<br>
'''ABN''' Aerodrome Beacon<br>
<br>
'''ABND''' Abandon<br>
<br>
'''ABNDT''' Abundant<br>
<br>
'''ABNML''' Abnormal<br>
<br>
'''ABT''' About<br>
<br>
'''ABV''' Above<br>
<br>
'''AC''' Advisory Circular<br>
<br>
'''AC''' Altocumulus<br>
<br>
'''AC''' Assistant Chief<br>
<br>
'''ACA''' Artic Control Area<br>
<br>
'''ACARS''' Aircraft Communication Addressing and Reporting System<br>
<br>
'''ACAS''' Airborne Collision Avoidance System<br>
<br>
'''ACC''' Altocumulus Castellanus<br>
<br>
'''ACC''' Area Control Center<br>
<br>
'''ACCID''' Notification of Aircraft Accident<br>
<br>
'''ACCT''' Account<br>
<br>
'''ACCUM''' Accumulate<br>
<br>
'''ACDNT''' Accident<br>
<br>
'''ACDO''' Air Carrier District Office<br>
<br>
'''ACE''' Central Region<br>
<br>
'''ACES''' Access<br>
<br>
'''ACFT''' Aircraft<br>
<br>
'''ACID''' Aircraft Identification<br>
<br>
'''ACK''' Acknowledge<br>
<br>
'''ACL''' Altimeter Check Location<br>
<br>
'''ACLD''' Above Clouds<br>
<br>
'''ACLS''' Automatic Carrier Landing System<br>
<br>
'''ACLT''' Accelerate<br>
<br>
'''ACM''' Air combat maneuvers<br>
<br>
'''ACN''' Aircraft Classification Number<br>
<br>
'''ACN''' All Concerned Notified<br>
<br>
'''ACNOT''' Accident Notice<br>
<br>
'''ACP''' Acceptance (message type designator)<br>
<br>
'''ACP''' Area Command Post<br>
<br>
'''ACPT''' Accept<br>
<br>
'''ACPY''' Accompany<br>
<br>
'''ACR''' Air Carrier<br>
<br>
'''ACRBT''' Acrobatic<br>
<br>
'''ACRS''' Across<br>
<br>
'''ACSL''' Standing Lenticular Altocumulus<br>
<br>
'''ACT''' Active or Activated or Activity<br>
<br>
'''ACT''' Air Combat Training<br>
<br>
'''ACT''' Technical Center<br>
<br>
'''ACTG''' Acting<br>
<br>
'''ACTV''' Active<br>
<br>
'''ACTVT''' Activate<br>
<br>
'''ACW''' Aircraft Control and Warning<br>
<br>
'''ACYC''' Anticyclonic<br>
<br>
'''AD''' Aerodrome<br>
<br>
'''ADA''' Advisory Area<br>
<br>
'''ADAP''' Airport Development Aid Program<br>
<br>
'''ADC''' Aerodrome Chart<br>
<br>
'''ADCF''' Air Defense Control Facility<br>
<br>
'''ADCON''' Advise or issue instructions to all concerned<br>
<br>
'''ADCUS''' Advise Customs<br>
<br>
'''ADDN''' Addition<br>
<br>
'''ADE''' Air Defense Emergency<br>
<br>
'''ADF''' Automatic Direction Finder<br>
<br>
'''ADFAP''' Automatic Direction Finder Approach<br>
<br>
'''ADIZ''' Air Defense Identification Zone<br>
<br>
'''ADJ''' Adjacent<br>
<br>
'''ADL''' Aggregate Demand List<br>
<br>
'''ADLO''' Air Defense Liaison Officer<br>
<br>
'''ADLY''' Arrival Delay<br>
<br>
'''ADMAP''' Advise by Air Mail as Soon as Possible<br>
<br>
'''ADMIN''' Administration<br>
<br>
'''ADMIR''' Administrator<br>
<br>
'''ADMIS''' Aircraft Departing at (number of minutes) Interval<br>
<br>
'''ADMIV''' Administrative<br>
<br>
'''ADNL''' TFC Additional Traffic<br>
<br>
'''ADNOK''' Advise if not correct<br>
<br>
'''ADO''' Aerodrome Office (specify service)<br>
<br>
'''ADO''' Airport District Office<br>
<br>
'''ADP''' Automatic Data Processing<br>
<br>
'''ADPE''' Automatic Data Processing Equipment<br>
<br>
'''ADPS''' Automatic Data Processing Systems<br>
<br>
'''ADQT''' Adequate<br>
<br>
'''ADR''' Advisory Route<br>
<br>
'''ADR''' Airport Departure Rate<br>
<br>
'''ADRDE''' Advise Reason for Delay<br>
<br>
'''ADRNDCK''' Adirondack<br>
<br>
'''ADRT''' Alternate Departure Route<br>
<br>
'''ADS''' Address<br>
<br>
'''ADS''' Air Defense Sector<br>
<br>
'''ADS''' Automatic Dependent Surveillance<br>
<br>
'''ADSPN''' Advise Disposition<br>
<br>
'''ADSU''' Automatic Dependent Surveillance Unit<br>
<br>
'''ADV''' Advise<br>
<br>
'''ADVALT''' Allotment Advice<br>
<br>
'''ADVC''' Advice<br>
<br>
'''ADVCTN''' Advection<br>
<br>
'''ADVN''' Advance<br>
<br>
'''ADVY''' Advisory<br>
<br>
'''ADVZY''' Advisory<br>
<br>
'''ADW''' Air Defense Warning<br>
<br>
'''ADZ''' Advise<br>
<br>
'''ADZAR''' Advise Arrival<br>
<br>
'''ADZI''' Advise Intentions<br>
<br>
'''ADZOF''' Advise This Office<br>
<br>
'''ADZY''' Advisory<br>
<br>
'''AEA''' Eastern Region<br>
<br>
'''AEM''' Aircraft and Engine Mechanic<br>
<br>
'''AENG''' Airways Engineer<br>
<br>
'''AER''' Approach End Runway<br>
<br>
'''AERO''' Aeronautical<br>
<br>
'''AES''' Aircraft Earth Station<br>
<br>
'''AEU''' Europe Africa and Middle East Office<br>
<br>
'''AEVAC''' Air Evacuation<br>
<br>
'''AEW''' Airborne Early Warning<br>
<br>
'''AFB''' Air Force Base<br>
<br>
'''AFC''' Area Forecast Center<br>
<br>
'''AFCT''' Affect<br>
<br>
'''AFD''' Airport Facility Directory<br>
<br>
'''AFDK''' After Dark<br>
<br>
'''AFIL''' Filed Flight Plan in the Air<br>
<br>
'''AFIO''' Authorization for Interceptor Operations<br>
<br>
'''AFIRM''' Affirmative<br>
<br>
'''AFIS''' Aerodrome Flight Information Service<br>
<br>
'''AFJ''' Air Force Jet<br>
<br>
'''AFM''' Affirmative<br>
<br>
'''AFNEA''' Air Force NOTAM Exchange Area<br>
<br>
'''AFNEO''' Air Force NOTAM Exchange Office<br>
<br>
'''AFOVRN''' Air Force Overrun (1000ft standard approach lighting system)<br>
<br>
'''AFREP''' Air Force Representative<br>
<br>
'''AFRT''' Air Freight<br>
<br>
'''AFS''' Aeronautical Fixed Service<br>
<br>
'''AFSS''' Automated Flight Service Station<br>
<br>
'''AFT''' After<br>
<br>
'''AFTN''' Aeronautical Fixed Telecommunications Network<br>
<br>
'''AFTN''' Afternoon<br>
<br>
'''AG''' Air Ground<br>
<br>
'''AGA''' Aerodromes Air Routes and Ground Aids<br>
<br>
'''AGACS''' Automatic Ground Air Ground Communication System<br>
<br>
'''A-GEAR''' Arresting Gear<br>
<br>
'''AGL''' Above Ground Level<br>
<br>
'''AGL''' Great Lakes Region<br>
<br>
'''AGN''' Again<br>
<br>
'''AGR''' Agree<br>
<br>
'''AGRMT''' Agreement<br>
<br>
'''AHD''' Ahead<br>
<br>
'''AI''' Arrival Approved Request for IFR Flight<br>
<br>
'''AIA''' Advise if Able<br>
<br>
'''AIATSC''' All International Air Traffic Switching Centers<br>
<br>
'''AIC''' Aeronautical Information Circular<br>
<br>
'''AID''' Airport Information Desk<br>
<br>
'''AIDC''' Air Traffic services Inter facility Data Communication<br>
<br>
'''AIFP''' Activate IFR Flight Plan<br>
<br>
'''AILS''' Automatic Instrument Landing System<br>
<br>
'''AIM''' Airman’s Information Manual<br>
<br>
'''AIP''' Aeronautical Information Publication<br>
<br>
'''AIRAC''' Aeronautical Information Regulation and Control<br>
<br>
'''AIRCOMNET''' Air Force Communications Network<br>
<br>
'''AIREP''' Air Report<br>
<br>
'''AIRFL''' Air Refueling<br>
<br>
'''AIRMET''' Airmen's Meteorological Information<br>
<br>
'''AIROPNET''' Air Operations Network<br>
<br>
'''AIS''' Aeronautical Information Service<br>
<br>
'''AIS''' Aeronautical Information Specialist<br>
<br>
'''AIS''' Airport in sight<br>
<br>
'''AL''' All  Field Offices and Personnel<br>
<br>
'''AL''' Annual Leave<br>
<br>
'''AL/At''' Least (altitude)<br>
<br>
'''ALA''' Alighting Area<br>
<br>
'''ALACFO''' All Air Carrier Field Offices<br>
<br>
'''ALADLO''' All Air Defense Liaison Officers in Service Area<br>
<br>
'''ALAFFO''' All Technical Operations<br>
<br>
'''ALANO''' All Accident Notice Offices<br>
<br>
'''ALARTC''' All Air Route Traffic Control Centers in Service Area<br>
<br>
'''ALAT''' All Air Traffic Service Personnel in Service Area<br>
<br>
'''ALATAS''' All Air Traffic (area) Supervisors in Service Area<br>
<br>
'''ALATF''' All Air Traffic Field Facilities<br>
<br>
'''ALATFO''' All Air Traffic Field Offices<br>
<br>
'''ALCKT''' All Offices Having Send−receive Teletypewriter Service on Circuit<br>
<br>
'''ALCS/C''' All Air Traffic Combined Station/ Centers in Service Area<br>
<br>
'''ALCS/T''' All Air Traffic Combined Station/ Towers in Service Area<br>
<br>
'''ALCT''' Attempt to Locate<br>
<br>
'''ALDA''' Air Line Dispatchers Association<br>
<br>
'''ALERFA''' Alert Phase Code (alerting service)<br>
<br>
'''ALF''' Aloft<br>
<br>
'''ALFAB''' All Offices on NADIN<br>
<br>
'''ALFSFO''' All Flight Standards Field Offices<br>
<br>
'''ALFSS''' All Flight Service Stations in Service Area<br>
<br>
'''ALG''' Along<br>
<br>
'''ALGHNY''' Allegheny<br>
<br>
'''ALIATSC''' All International Aeronautical Telecommunication Switching Centers<br>
<br>
'''ALIFO''' All International Field Offices<br>
<br>
'''ALIFSS''' All International Flight Service Stations in Service Area<br>
<br>
'''ALNMT''' Alignment<br>
<br>
'''ALNOT''' Alert Notice<br>
<br>
'''ALP''' Airport Layout Plan<br>
<br>
'''ALPA''' Air Line Pilots Association<br>
<br>
'''ALQDS''' All Quadrants<br>
<br>
'''ALR''' Alerting<br>
<br>
'''ALRAFAC''' All Radar Facilities in Service Area<br>
<br>
'''ALRGN''' All Regional Service Area Offices<br>
<br>
'''ALS''' Approach Light System<br>
<br>
'''ALSEC''' All Sectors<br>
<br>
'''ALSF''' Approach Lighting System With Sequenced Flashing Lights<br>
<br>
'''ALSF1''' Approach Lighting System With Sequenced Flashers Cat 1<br>
<br>
'''ALSF-1''' Approach Lighting System With Sequenced Flashers Cat 1<br>
<br>
'''ALSF2''' Approach Lighting System With Sequenced Flashers Cat 2<br>
<br>
'''ALSF-2''' Approach Lighting System With Sequenced Flashers Cat 2<br>
<br>
'''ALSFI''' Approach Lighting System With Sequenced Flashers Cat 1<br>
<br>
'''ALSF-I''' Approach Lighting System With Sequenced Flashers Cat 1<br>
<br>
'''ALFSII''' Approach Lighting System With Sequenced Flashers Cat 2<br>
<br>
'''ALSF-II''' Approach Lighting System With Sequenced Flashers Cat 2<br>
<br>
'''ALSTG''' Altimeter Setting<br>
<br>
'''ALT''' Altitude<br>
<br>
'''ALTA''' Alberta<br>
<br>
'''ALTM''' Altimeter<br>
<br>
'''ALTN''' Alternate<br>
<br>
'''ALTPT''' Alternate Airport<br>
<br>
'''ALTRV''' Altitude Reservation<br>
<br>
'''ALTWR''' All Towers in Service Area<br>
<br>
'''ALUTN''' Aleutian<br>
<br>
'''ALWF''' Actual Wind Factor<br>
<br>
'''AM''' Ante Meridiem<br>
<br>
'''AMA''' Area Minimum Altitude<br>
<br>
'''AMB''' Ambiguity<br>
<br>
'''AMC''' Air Mobility Command<br>
<br>
'''AMC''' Mike Monroney Aeronautical Center<br>
<br>
'''AMCL''' Amended Clearance<br>
<br>
'''AMD''' Amend<br>
<br>
'''AMD''' Amended Forecast<br>
<br>
'''AMDT''' Amendment<br>
<br>
'''AMECH''' Account Mechanical<br>
<br>
'''AMGR''' Airport Manager<br>
<br>
'''AMIS''' Aircraft Movement Information Services<br>
<br>
'''AMOS''' Automatic Meteorological Observing System<br>
<br>
'''AMP''' Amplifier or Amplify<br>
<br>
'''AMPLTD''' Amplitude<br>
<br>
'''AMRF''' Amended Route of Flight<br>
<br>
'''AMS''' Aeronautical Mobile Service<br>
<br>
'''AMS''' Air Mass<br>
<br>
'''AMS''' American Meteorological Society<br>
<br>
'''AMSL''' Above Mean Sea Level<br>
<br>
'''AMSS''' Aeronautical Mobile Satellite Service<br>
<br>
'''AMT''' Amount<br>
<br>
'''AMVER''' Automated Mutual Assistance Vessel Rescue System<br>
<br>
'''ANC''' Aeronautical Chart<br>
<br>
'''ANCPT''' Anticipate<br>
<br>
'''ANCS''' Aeronautical Navigation Chart Small Scale<br>
<br>
'''ANE''' New England Region<br>
<br>
'''ANF''' Air Navigation Facility<br>
<br>
'''ANG''' Air National Guard<br>
<br>
'''ANLYS''' Analysis<br>
<br>
'''ANM''' Northwest Mountain Region<br>
<br>
'''ANMS''' Automatic Network Management System<br>
<br>
'''ANNC''' Announce<br>
<br>
'''ANR''' Advanced Navigation Routes<br>
<br>
'''ANRA''' Air Navigation Radio Aids<br>
<br>
'''ANS''' Answer<br>
<br>
'''ANT''' Antenna<br>
<br>
'''AO1''' ASOS Automated Observation Without Precipitation Discriminator (rain/snow)<br>
<br>
'''AO2''' ASOS Automated Observation With Precipitation Discriminator (rain/ snow)<br>
<br>
'''AOA''' At or Above<br>
<br>
'''AOAF''' At or After<br>
<br>
'''AOB''' At or Below<br>
<br>
'''AOBF''' At or Before<br>
<br>
'''AOC''' Aerodrome Obstacle Chart<br>
<br>
'''AOC''' Airport Operating Certificate<br>
<br>
'''AOCP''' Aircraft Out of Commission for Parts<br>
<br>
'''AOE''' Airport of Entry<br>
<br>
'''AOPA''' Aircraft Owners and Pilots Association<br>
<br>
'''AP''' Airport<br>
<br>
'''AP''' Anomalous Propagation<br>
<br>
'''APAP''' Approach Path Alignment Panel<br>
<br>
'''APAP''' This list is copywritten and belongs to proairpilot<br>
<br>
'''APAPI''' Abbreviated Precision Approach Path Indicator<br>
<br>
'''APC''' Area Positive Control<br>
<br>
'''APCH''' Approach<br>
<br>
'''APDC''' Aircraft parking/docking chart<br>
<br>
'''APL''' Airport Lights<br>
<br>
'''APLCN''' Appalachian<br>
<br>
'''APN''' Apron<br>
<br>
'''APNT''' Appoint<br>
<br>
'''APP''' Approach Control<br>
<br>
'''APP''' Approach Control Office<br>
<br>
'''APPA''' Advise Present Position and Altitude<br>
<br>
'''APPR''' Appear<br>
<br>
'''APR''' Airports Program Report<br>
<br>
'''APREQ''' Approval Request<br>
<br>
'''APRNT''' Apparent<br>
<br>
'''APROP''' Appropriate<br>
<br>
'''APRX''' Approximate<br>
<br>
'''APS''' Airborne Pulse Search Radar<br>
<br>
'''APSG''' After Passing<br>
<br>
'''APV''' Approve<br>
<br>
'''APVL''' Approval<br>
<br>
'''AR''' Atlantic Route<br>
<br>
'''ARAC''' Area Airports Checked<br>
<br>
'''ARAC''' Army Radar Approach Control Facility<br>
<br>
'''ARAD''' Altitude Radial<br>
<br>
'''ARB''' Air Reserve Base<br>
<br>
'''ARC''' Area chart<br>
<br>
'''ARCP''' Air Refueling Control Point<br>
<br>
'''AREP''' Air Refueling Egress Point<br>
<br>
'''AREX''' Air Refueling Exit<br>
<br>
'''ARFF''' Aircraft Rescue and Fire Fighting<br>
<br>
'''ARFFOK''' Airport Rescue and Fire Fighting Alarm Checked<br>
<br>
'''ARFOR''' Area Forecast<br>
<br>
'''ARINC''' Aeronautical Radio Incorporated<br>
<br>
'''ARIP''' Air Refueling Initial Point<br>
<br>
'''ARL''' Aerial<br>
<br>
'''ARLO''' Army Liaison Officer<br>
<br>
'''ARMET''' Forecast upper wind and temperature at specified points<br>
<br>
'''ARML''' Airmail<br>
<br>
'''ARND''' Around<br>
<br>
'''ARNG''' Arrange<br>
<br>
'''ARNOT''' Area Notice<br>
<br>
'''ARO''' Air Traffic Services Reporting Office<br>
<br>
'''ARO''' Airport Reservations Office<br>
<br>
'''ARP''' Aerodrome Reference Point<br>
<br>
'''ARP''' Airport Reference Point<br>
<br>
'''ARP''' Airport Reservation Position<br>
<br>
'''ARP''' Air Report<br>
<br>
'''ARPT''' Airport<br>
<br>
'''ARQ''' Automatic Error Correction Equipment<br>
<br>
'''ARR''' Arrival or Arrive<br>
<br>
'''ARS''' Air Rescue Service (USAF)<br>
<br>
'''ARS''' Special Air Report<br>
<br>
'''ARSA''' Airport Radar Service Area<br>
<br>
'''ARSR''' Air Route Surveillance Radar<br>
<br>
'''ARST''' Arrest<br>
<br>
'''ARTC''' Air Route Traffic Control<br>
<br>
'''ARTCC''' Air Route Traffic Control Center<br>
<br>
'''ARTS''' Automated Radar Terminal Systems<br>
<br>
'''ARU''' Airborne Radar Unit<br>
<br>
'''ARU''' Airspace Reservation Unit<br>
<br>
'''ARUNK''' Arrival Unknown<br>
<br>
'''AS''' Altostratus<br>
<br>
'''AS/R''' Automatic Send/Receive<br>
<br>
'''ASAP''' As Soon As Possible<br>
<br>
'''ASC''' Ascent to<br>
<br>
'''ASCU''' Automatic Scanning Control Unit<br>
<br>
'''ASD''' Airspace Docket<br>
<br>
'''ASDA''' Accelerate Stop Distance Available<br>
<br>
'''ASDE''' Airport Surface Detection Equipment<br>
<br>
'''ASE''' Altimetry System Error<br>
<br>
'''ASGN''' Assign<br>
<br>
'''ASI''' Altimeter Setting Indicator<br>
<br>
'''ASIP''' Airspace Flight Inspection Pilot<br>
<br>
'''ASL''' Above Sea Level<br>
<br>
'''ASMD''' Assumed<br>
<br>
'''ASN''' Antenna Structure Number<br>
<br>
'''ASND''' Ascend<br>
<br>
'''ASO''' Southern Region<br>
<br>
'''ASOS''' Automated Surface Observing System<br>
<br>
'''ASP''' Airport System Plan<br>
<br>
'''ASP''' Airspace<br>
<br>
'''ASPH''' Asphalt<br>
<br>
'''ASR''' Airport Surveillance Radar<br>
<br>
'''ASSOC''' Associate<br>
<br>
'''ASST''' Assistant<br>
<br>
'''ASW''' Southwest Region<br>
<br>
'''ATA''' Actual Time of Arrival<br>
<br>
'''ATA''' Air Transport Association of America<br>
<br>
'''ATAM''' At and Maintain<br>
<br>
'''ATAR''' Above Transmitted as Received Air Traffic Control<br>
<br>
'''ATC''' Air Traffic Control<br>
<br>
'''ATCA''' Air Traffic Control Association<br>
<br>
'''ATCA''' ATC Advises<br>
<br>
'''ATCAA''' ATC Assigned Airspace<br>
<br>
'''ATCBI''' ATC Beacon Interrogator<br>
<br>
'''ATCC''' ATC Clears<br>
<br>
'''ATCF'''  ATC Facility<br>
<br>
'''ATCH''' Attach<br>
<br>
'''ATCOR''' ATC Operations Representative<br>
<br>
'''ATCR''' ATC Requests<br>
<br>
'''ATCRBS''' ATC Radar Beacon System<br>
<br>
'''ATCS''' ATC Specialist<br>
<br>
'''ATCSCC''' David J. Hurley  Systems Command Center<br>
<br>
'''ATCT''' Airport Traffic Control Tower<br>
<br>
'''ATD''' Actual Time of Departure<br>
<br>
'''ATFC''' Account Traffic<br>
<br>
'''ATFM''' Air Traffic Flow Management<br>
<br>
'''ATIS''' Automatic Terminal Information Service<br>
<br>
'''ATLC''' Atlantic<br>
<br>
'''ATM''' Air Traffic Management<br>
<br>
'''ATM''' Authentication Maneuver<br>
<br>
'''ATMT''' Attempt<br>
<br>
'''ATMTC''' Attempt to Contact<br>
<br>
'''ATN''' Aeronautical Telecommunications Network<br>
<br>
'''ATND''' Attend<br>
<br>
'''ATO''' Aeronautical Telecommunications Operator<br>
<br>
'''ATO''' Air Traffic Organization<br>
<br>
'''ATOG''' Allowable Takeoff Gross Weight<br>
<br>
'''ATP''' Actual Time of Penetration<br>
<br>
'''ATP''' Air Traffic Procedures<br>
<br>
'''ATPAC''' Air Traffic Procedures Advisory Committee<br>
<br>
'''ATR''' Air Transport Rating<br>
<br>
'''ATREP''' Air Traffic Representative<br>
<br>
'''ATRLS''' Actual Time of Release<br>
<br>
'''ATSCCP''' Air Traffic Service Contingency Command Post<br>
<br>
'''ATT''' American Telephone and Telegraph Company<br>
<br>
'''ATTM''' At This Time<br>
<br>
'''ATTN''' Attention<br>
<br>
'''AT-VASIS''' Abbreviated T Visual Approach Slope Indicator System<br>
<br>
'''ATZ''' Aerodrome Traffic Zone<br>
<br>
'''AUGRA''' Authority Granted<br>
<br>
'''AURBO''' Aurora Borealis<br>
<br>
'''AUREQ''' Authority is Requested<br>
<br>
'''AUTH''' Authority<br>
<br>
'''AUTH''' Authorized<br>
<br>
'''AUTO''' Automatic<br>
<br>
'''AUTOB''' Automatic Weather Reporting System<br>
<br>
'''AUW''' All Up Weight (gross weight)<br>
<br>
'''AUX''' Auxiliary<br>
<br>
'''AUZ''' Authorize<br>
<br>
'''AVANA''' Altitude reservation void for aircraft not airborne by<br>
<br>
'''AVBL''' Available<br>
<br>
'''AVFP''' Activate VFR Flight Plan<br>
<br>
'''AVFPNO''' Pilot failed to activate VFR/DVFR flight plan<br>
<br>
'''AVG''' Average<br>
<br>
'''AVGAS''' Aviation Gasoline<br>
<br>
'''AVN''' Aviation<br>
<br>
'''AWA''' Advise When Able<br>
<br>
'''AWANS''' Aviation Weather and NOTAM System<br>
<br>
'''AWBE''' Automatic Weather Broadcast Equipment<br>
<br>
'''AWE''' Advise When Established<br>
<br>
'''AWL''' All Weather Landing<br>
<br>
'''AWOS''' Automatic Weather Observing/ Reporting System<br>
<br>
'''AWP''' Aviation Weather Processors<br>
<br>
'''AWP''' Western-Pacific Region<br>
<br>
'''AWS''' Air Weather Service (USAF)<br>
<br>
'''AWT''' Await or Awaiting<br>
<br>
'''AWX''' Account Weather<br>
<br>
'''AWY''' Airway<br>
<br>
'''AXPS''' Air Express<br>
<br>
'''AZM''' Azimuth<br>
<br>
'''AZRAN''' Azimuth and Range Data<br>
<br>
</div>
</div>


== B ==
</html>
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''B''' Base Leg<br>
<br>
'''B''' Beginning of precipitation (time in minutes) (weather reports only)<br>
<br>
'''B''' Bering Standard Time (time groups only)<br>
<br>
'''B''' Blue<br>
<br>
'''B''' Center clearance delivered<br>
<br>
'''BA''' Braking Action<br>
<br>
'''BAC''' Below All Clouds<br>
<br>
'''BACLIN''' Baroclinic or Baroclinic Prognosis<br>
<br>
'''BAFVC''' Bids Accepted for the Following Vacancies<br>
<br>
'''BAL''' Balance<br>
<br>
'''BASE''' Cloud Base<br>
<br>
'''BASOPS''' Base Operations Office<br>
<br>
'''BATROP''' Barotropic or Barotropic Prognosis<br>
<br>
'''BC''' Back Course<br>
<br>
'''BC''' Beginning Climb<br>
<br>
'''BC''' British Columbia<br>
<br>
'''BC''' Patchy<br>
<br>
'''BCFG''' Patchy fog<br>
<br>
'''BCH''' Beach<br>
<br>
'''BCKG''' Backing<br>
<br>
'''BCM''' Back Course Marker<br>
<br>
'''BCM''' Become<br>
<br>
'''BCN''' Beacon<br>
<br>
'''BCREQ''' Broadcast Requested<br>
<br>
'''BCST''' Broadcast<br>
<br>
'''BCSTN''' Broadcast Station<br>
<br>
'''BDA''' Bermuda<br>
<br>
'''BDAT''' Beacon Data (digitized)<br>
<br>
'''BDR''' Border<br>
<br>
'''BDRY''' Boundary<br>
<br>
'''BDSLD''' Bids Solicited<br>
<br>
'''BECMG''' Becoming<br>
<br>
'''BFDK''' Before Dark<br>
<br>
'''BFR''' Before<br>
<br>
'''BGN''' Began or Begin<br>
<br>
'''BGND''' Begin or Beginning Descent<br>
<br>
'''BHND''' Behind<br>
<br>
'''BIFR''' Before Encountering IFR Conditions<br>
<br>
'''BINOVC''' Breaks in Overcast<br>
<br>
'''BKN''' Broken<br>
<br>
'''BL''' Blowing<br>
<br>
'''BLD''' Build<br>
<br>
'''BLDG''' Building<br>
<br>
'''BLDU''' Blowing Dust<br>
<br>
'''BLDUP''' Buildup<br>
<br>
'''BLKHLS''' Black Hills<br>
<br>
'''BLKT''' Blanket<br>
<br>
'''BLN''' Balloon<br>
<br>
'''BLO''' Below<br>
<br>
'''BLO''' Below Clouds<br>
<br>
'''BLSA''' Blowing Sand<br>
<br>
'''BLSN''' Blowing Snow<br>
<br>
'''BLW''' Below<br>
<br>
'''BLX''' Block<br>
<br>
'''BLZD''' Blizzard<br>
<br>
'''BMBR''' Bomber<br>
<br>
'''BMS''' Basic Meteorological Services<br>
<br>
'''BND''' Bound<br>
<br>
'''BNDRY''' Boundary<br>
<br>
'''BNTH''' Beneath<br>
<br>
'''BOMB''' Bombing<br>
<br>
'''BOVC''' Base of Overcast<br>
<br>
'''BPOC''' Before Proceeding On Course<br>
<br>
'''BPS''' Bytes Per Second<br>
<br>
'''BPT''' Beginning Procedure Turn<br>
<br>
'''BR''' Bahama Route<br>
<br>
'''BR''' Branch<br>
<br>
'''BR''' Mist<br>
<br>
'''BRAF''' Braking Action Fair<br>
<br>
'''BRAG''' Braking Action Good<br>
<br>
'''BRAN''' Braking Action Nil<br>
<br>
'''BRAP''' Braking Action Poor<br>
<br>
'''BRF''' Brief<br>
<br>
'''BRG''' Bearing<br>
<br>
'''BRGT''' Bright<br>
<br>
'''BRITE''' Bright Radar Indicator Tower Equipment<br>
<br>
'''BRK''' Break<br>
<br>
'''BRKG''' Braking<br>
<br>
'''BRKHIC''' Breaks in Higher Overcast<br>
<br>
'''BRKSHR''' Berkshire<br>
<br>
'''BRM''' Barometer<br>
<br>
'''BS''' Commercial Broadcasting Station<br>
<br>
'''BSAF''' Bids Solicited as Follows<br>
<br>
'''BSC''' Bird Sweep Completed<br>
<br>
'''BSHP''' Beginning Standard Holding Procedure<br>
<br>
'''BSIAP''' Beginning Straight In Approach<br>
<br>
'''BSRAP''' Beginning Standard Range Approach<br>
<br>
'''BSRO''' Begin Standard Refuel Orbit<br>
<br>
'''BT''' Back Taxiing<br>
<br>
'''BTL''' Between Layers<br>
<br>
'''BTN''' Between<br>
<br>
'''BTR''' Better<br>
<br>
'''BTWN''' Between<br>
<br>
'''BUEC''' Backup Emergency Communication<br>
<br>
'''BUIC''' Backup Interceptor Control<br>
<br>
'''BUL''' Bulletin<br>
<br>
'''BUR''' Bureau<br>
<br>
'''BUS''' Business<br>
<br>
'''BY''' Blowing Spray (weather reports only)<br>
<br>
'''BYD''' Beyond<br>
<br>
'''BZR''' Buzzer (radar)<br>
<br>
</div>
 
== C ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''C''' Celsius<br>
<br>
'''C''' Central Standard Time (time groups only)<br>
<br>
'''C''' Centre (runway ID)<br>
<br>
'''C''' Circling (approach and landing charts)<br>
<br>
'''C''' Continental (air mass)<br>
<br>
'''C/A''' Coarse/Acquisition<br>
<br>
'''CA''' Clear Above (PIREP only)<br>
<br>
'''CAAS''' Class A Airspace<br>
<br>
'''CAC''' Change to Approach Control<br>
<br>
'''CAC''' Changing to Approach Control<br>
<br>
'''CAC''' Contact Approach Control<br>
<br>
'''CACT''' Civil Air Carrier Turbojet<br>
<br>
'''CADO''' Chief Airport District Office<br>
<br>
'''CAM''' Canadian Armed Forces Transport Command<br>
<br>
'''CAN''' Canada<br>
<br>
'''CANFORCE''' Canadian Armed Force<br>
<br>
'''CANO''' Catalogue Number<br>
<br>
'''CANOT''' Canadian NOTAM<br>
<br>
'''CANR''' Canadian NORAD Region<br>
<br>
'''CAO''' Change of Appointing Office<br>
<br>
'''CAP''' Civil Air Patrol<br>
<br>
'''CAP/IS''' Combined Approach Control/International Station<br>
<br>
'''CAPD''' Climb at Pilot’s Discretion<br>
<br>
'''CAPT''' Captain<br>
<br>
'''CARA''' Check Area Airports<br>
<br>
'''CARF''' Central Altitude Reservation Function<br>
<br>
'''CARIB''' Caribbean<br>
<br>
'''CARU''' Canadian Airspace Reservation Unit<br>
<br>
'''CAS''' Calibrated Airspeed<br>
<br>
'''CAS''' Collision Avoidance System<br>
<br>
'''CASCDS''' Cascades<br>
<br>
'''CAT''' Category<br>
<br>
'''CAT''' Clear Air Turbulence<br>
<br>
'''CATX''' Climb and Cross<br>
<br>
'''CAUFN''' Caution Advised Until Further Notice<br>
<br>
'''CAVOK''' Cloud and Visibility OK<br>
<br>
'''CAVU''' Clear or scattered clouds and visibility greater than ten miles<br>
<br>
'''CAWS''' Common Aviation Weather Subsystem<br>
<br>
'''CB''' Cumulonimbus<br>
<br>
'''CBAS''' Class B Airspace<br>
<br>
'''CBMAM''' Cumulonimbus Mamma<br>
<br>
'''CBSA''' Class B Surface Area<br>
<br>
'''CC''' Carbon Copy<br>
<br>
'''CC''' Cirrocumulus<br>
<br>
'''CCA''' Continental Control Area<br>
<br>
'''CCAS''' Class C airspace<br>
<br>
'''CCC''' Central Computer Complex<br>
<br>
'''CCC''' Regional Communications Control Center<br>
<br>
'''CCD''' City (or County) Civil Defense Director____<br>
<br>
'''CCFP''' Collaborative Convective Forecast Product<br>
<br>
'''CCLDS''' Clear of Clouds<br>
<br>
'''CCLKOB''' Counterclockwise Orbit<br>
<br>
'''CCLKWS''' Counterclockwise<br>
<br>
'''CCRU''' Complete Crew<br>
<br>
'''CCRZ''' Climb and Cruise<br>
<br>
'''CCSA''' Class C Surface Area<br>
<br>
'''CCSL''' Standing Lenticular Cirrocumulus<br>
<br>
'''CCTLR''' Chief Controller<br>
<br>
'''CCUS''' Cleared Customs<br>
<br>
'''CD''' Candela<br>
<br>
'''CD''' Civil Defense<br>
<br>
'''CD''' Clearance Delivery<br>
<br>
'''CDAS''' Class D Airspace<br>
<br>
'''CDC''' Computer Display Channel<br>
<br>
'''CDFNT''' Cold Front<br>
<br>
'''CDM''' Collaborative Decision Making<br>
<br>
'''CDN''' Coordination<br>
<br>
'''CDO''' Communications Duty Officer<br>
<br>
'''CDSA''' Class D Surface Area<br>
<br>
'''CE''' Communications Equipment<br>
<br>
'''CEAS''' Class E Airspace<br>
<br>
'''CELNAV''' Celestial Navigation<br>
<br>
'''CENGR''' Civil Engineer<br>
<br>
'''CENPAC''' Central North Pacific<br>
<br>
'''CER''' Climb En Route<br>
<br>
'''CERAP''' Combined Center/RAPCON<br>
<br>
'''CERT''' Certificate<br>
<br>
'''CERTIF''' Certification<br>
<br>
'''CESA''' Class E Surface Area<br>
<br>
'''CF''' Change Frequency<br>
<br>
'''CFA''' Controlled Firing Area<br>
<br>
'''CFAD''' Composite Flight Data Processing<br>
<br>
'''CFADC''' Canadian Forces Air Defense Command<br>
<br>
'''CFAP''' Cleared for Approach<br>
<br>
'''CFM''' Confirm<br>
<br>
'''CFN''' Confine<br>
<br>
'''CFP''' Cold Front Passage<br>
<br>
'''CFPL''' Carryover From Previous Log<br>
<br>
'''CFR''' Code of Federal Regulations<br>
<br>
'''CFWSU''' Central Flow Weather Service Unit<br>
<br>
'''CFY''' Clarify<br>
<br>
'''CG''' Coast Guard<br>
<br>
'''CGAS''' Class G Airspace<br>
<br>
'''CGAS''' Coast Guard Air Station<br>
<br>
'''CGL''' Circling Guidance Light<br>
<br>
'''CGLS''' Coast Guard LORAN Station<br>
<br>
'''CGSTN''' Congestion<br>
<br>
'''CH''' Channel<br>
<br>
'''CH''' Channel continuity check of transmission to permit comparison of record of channel sequence numbers of messages received on the channel<br>
<br>
'''CHAP''' Chapter<br>
<br>
'''CHARC''' Characteristic<br>
<br>
'''CHC''' Chance<br>
<br>
'''CHG''' Change<br>
<br>
'''CHGO''' Changing Over<br>
<br>
'''CHM''' Chemicals<br>
<br>
'''CHNL''' Channel<br>
<br>
'''CHOK''' Check Okay<br>
<br>
'''CHOV''' Changeover<br>
<br>
'''CHRG''' Charge<br>
<br>
'''CHSPK''' Chesapeake<br>
<br>
'''CHTR''' Charter<br>
<br>
'''CI''' Cirrus<br>
<br>
'''CIC''' Controller in Charge<br>
<br>
'''CIDIN''' Common Data Interchange Network<br>
<br>
'''CIFP''' Cancel IFR Flight Plan<br>
<br>
'''CIFR''' Cancel IFR Clearance Previously Given<br>
<br>
'''CIFRR''' Common IFR Room<br>
<br>
'''CIG''' Ceiling<br>
<br>
'''CINCNORAD''' Commander in Chief North American Aerospace Defense Command<br>
<br>
'''CIRNAV''' Circumnavigate<br>
<br>
'''CIRNOT''' Circuit Notice<br>
<br>
'''CIRVIS''' Communications Instructions for Reporting Vital Intelligence Sightings<br>
<br>
'''CIT''' Near or over large towns<br>
<br>
'''CIV''' Civil<br>
<br>
'''CK''' Check<br>
<br>
'''CKT''' Circuit<br>
<br>
'''CL''' Centre Line<br>
<br>
'''CL''' Closing Station<br>
<br>
'''CL''' Course Line<br>
<br>
'''CLA''' Clear type of ice formation<br>
<br>
'''CLB''' Climb<br>
<br>
'''CLBI''' Climb Immediately<br>
<br>
'''CLBN''' Crash Locator Beacon<br>
<br>
'''CLBR''' Calibration<br>
<br>
'''CLD''' Cloud<br>
<br>
'''CLG''' Calling<br>
<br>
'''CLKOB''' Clockwise Orbit<br>
<br>
'''CLKWS''' Clockwise<br>
<br>
'''CLN''' Colon<br>
<br>
'''CLNC''' Clearance<br>
<br>
'''CLODA''' Closing Date<br>
<br>
'''CLOTO''' Close This Office<br>
<br>
'''CLR''' Clear<br>
<br>
'''CLRAP''' Cleared as Planned<br>
<br>
'''CLRS''' Clear and Smooth<br>
<br>
'''CLSD''' Closed<br>
<br>
'''CLST''' Celestial<br>
<br>
'''CLU''' Circuit Line Up<br>
<br>
'''CM''' Centimeter<br>
<br>
'''CMA''' Comma<br>
<br>
'''CMB''' Climb to or climbing to<br>
<br>
'''CMNC''' Commence<br>
<br>
'''CMPCT''' Compact<br>
<br>
'''CMPL''' Complete or completed or completion<br>
<br>
'''CMPLT''' Complete<br>
<br>
'''CMPLX''' Complex<br>
<br>
'''CMPSN''' Composition<br>
<br>
'''CMPT''' Component<br>
<br>
'''CMS''' Construction Maintenance Supervisor<br>
<br>
'''CMSN''' Commission<br>
<br>
'''CNCL''' Cancel<br>
<br>
'''CNCNT''' Concurrently<br>
<br>
'''CNCT''' Connect<br>
<br>
'''CNDN''' Canadian<br>
<br>
'''CNL''' Cancel<br>
<br>
'''CNLFP''' Cancel Flight Plan<br>
<br>
'''CNS''' Communications Navigation and Surveillance<br>
<br>
'''CNS''' Consolidated NOTAM System<br>
<br>
'''CNSTNT''' Consistent<br>
<br>
'''CNTR''' Center<br>
<br>
'''CNTRL''' Central<br>
<br>
'''CNTRLN''' Centerline<br>
<br>
'''CNVG''' Converge<br>
<br>
'''CNVRT''' Convert<br>
<br>
'''CNVSN''' Conversion<br>
<br>
'''CNVTV''' Convective<br>
<br>
'''CO''' Company<br>
<br>
'''CO''' County<br>
<br>
'''COB''' Close of Business<br>
<br>
'''COC''' Climb on Course<br>
<br>
'''COLL''' Collect<br>
<br>
'''COM''' Communication<br>
<br>
'''COMB''' Combine<br>
<br>
'''COML''' Commercial<br>
<br>
'''COMLO''' Compass Locator<br>
<br>
'''COMPR''' Compare<br>
<br>
'''COMPRT''' Compartment<br>
<br>
'''CONC''' Concrete<br>
<br>
'''CONCA''' Continue Calling Until<br>
<br>
'''COND''' Condition<br>
<br>
'''CONF''' Confidential<br>
<br>
'''CONFDC''' Confidence<br>
<br>
'''CONFIG''' Configuration<br>
<br>
'''CONFIGN''' Configuration<br>
<br>
'''CONR''' Continental NORAD Region<br>
<br>
'''CONS''' Continuous<br>
<br>
'''CONSO''' CONSOLAN Facility<br>
<br>
'''CONSOL''' Consol Beacon<br>
<br>
'''CONSOLAN''' Low or medium frequency long range navigational aid<br>
<br>
'''CONST''' Construction<br>
<br>
'''CONT''' Continue or continued<br>
<br>
'''CONTDVD''' Continental Divide<br>
<br>
'''CONTH''' Continue to Hold<br>
<br>
'''CONTR''' Contract<br>
<br>
'''CONTRAILS''' Condensation Trails<br>
<br>
'''COORD''' Coordinate<br>
<br>
'''COORD''' Coordinates<br>
<br>
'''COP''' Changeover Point<br>
<br>
'''COPCOM''' Controllers’ Operations and Procedures Committee<br>
<br>
'''COPT''' Completed Procedure Turn<br>
<br>
'''COR''' Correct or corrected or correction<br>
<br>
'''CORAS''' Corridor Assignment<br>
<br>
'''COREQ''' Confirming Requisition Follows<br>
<br>
'''COT''' At the coast<br>
<br>
'''COV''' Cover<br>
<br>
'''CP''' Circular Polarization<br>
<br>
'''CPA''' Crash Phone Activated<br>
<br>
'''CPBL''' Capable<br>
<br>
'''CPD''' Coupled<br>
<br>
'''CPDLC''' Controller Pilot Data Link Communications<br>
<br>
'''CPF''' Complete Power Failure<br>
<br>
'''CPL''' Current Flight Plan<br>
<br>
'''CPME''' Calibration Performance Monitoring Equipment<br>
<br>
'''CPN''' Air Transport Pulse Radar Navigation Aid<br>
<br>
'''CPS''' Air Transport Pulse Radar Search<br>
<br>
'''CPTY''' Capacity<br>
<br>
'''CRAD''' Composite Radar Data Processing<br>
<br>
'''CRAF''' Civil Reserve Air Fleet<br>
<br>
'''CRC''' Circle<br>
<br>
'''CRC''' Cyclic Redundancy Check<br>
<br>
'''CRCHF''' Crew Chief<br>
<br>
'''CRLC''' Circulate<br>
<br>
'''CRS''' Course<br>
<br>
'''CRT''' Cathode Ray Tube<br>
<br>
'''CRTFY''' Certify<br>
<br>
'''CRYPTO''' Cryptographic<br>
<br>
'''CRZ''' Cruise<br>
<br>
'''CRZAM''' Cruise and Maintain<br>
<br>
'''CRZWTR''' Cruise Well to Right<br>
<br>
'''CS''' Call Sign<br>
<br>
'''CS''' Cirrostratus<br>
<br>
'''CS/C''' Combined Station/ Center<br>
<br>
'''CS/T''' Combined Station/ Tower<br>
<br>
'''CSATR''' Climb so as to reach<br>
<br>
'''CSATX''' Climb so as to cross<br>
<br>
'''CSDR''' Consider<br>
<br>
'''CSDRBL''' Considerable<br>
<br>
'''CSLDT''' Consolidate<br>
<br>
'''CST''' Coast<br>
<br>
'''CTA''' Control Area<br>
<br>
'''CTAF''' Common Traffic Advisory Frequency<br>
<br>
'''CTAM''' Climb to and maintain<br>
<br>
'''CTAS''' Controlled airspace<br>
<br>
'''CTAX''' Climb to and cross<br>
<br>
'''CTC''' Contact<br>
<br>
'''CTCC''' Change to Center Control or Changing to Center Control<br>
<br>
'''CTCC''' Contact Center Control<br>
<br>
'''CTCEN''' Contact Center<br>
<br>
'''CTGY''' Category<br>
<br>
'''CTL''' Control<br>
<br>
'''CTLA''' Control Area<br>
<br>
'''CTLB''' Control Boundary<br>
<br>
'''CTLR''' Controller<br>
<br>
'''CTLZ''' Control Zone<br>
<br>
'''CTN''' Caution<br>
<br>
'''CTR''' Control Zone<br>
<br>
'''CTRAC''' Common Terminal Radar Approach Control<br>
<br>
'''CTSKLS''' Catskills<br>
<br>
'''CU''' Cumulus<br>
<br>
'''CUF''' Cumuliform<br>
<br>
'''CUFRA''' Cumulus Fractus<br>
<br>
'''CUSNO''' Customs has been Notified<br>
<br>
'''CUST''' Customs<br>
<br>
'''CVFP''' Cancel VFR Flight Plan<br>
<br>
'''CVINO''' Clearance Void if Not Off<br>
<br>
'''CVN''' Convene<br>
<br>
'''CVR''' Cockpit Voice Recorder<br>
<br>
'''CVR''' Cover<br>
<br>
'''CVRS''' Computerized Voice Reservation System<br>
<br>
'''CW''' Continuous Wave<br>
<br>
'''CWM''' Change Weight Manifest<br>
<br>
'''CWRC''' Climb Well to Right of Course<br>
<br>
'''CWSU''' Center Weather Service Unit<br>
<br>
'''CWTR''' Climb Well to Right<br>
<br>
'''CWY''' Clearway<br>
<br>
'''CXA''' Cancel Approved Arrival<br>
<br>
'''CXD''' Cancel Approved Departure<br>
<br>
'''CYC''' Cyclonic<br>
<br>
'''CYCLGN''' Cyclogenesis<br>
<br>
'''CYL''' Cylinder<br>
<br>
'''CZM''' Coastal Zone Management<br>
<br>
</div>
 
== D ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''D''' Danger Area<br>
<br>
'''DA''' Decision Altitude<br>
<br>
'''DA''' Departure Approved<br>
<br>
'''DAAR''' Deviation Approved As Requested<br>
<br>
'''DABRK''' Daybreak<br>
<br>
'''DAE''' District Airport Engineer<br>
<br>
'''DAIRE''' Direct Altitude and Identification Readout Equipment<br>
<br>
'''DALGT''' Daylight<br>
<br>
'''DAP''' Do All Possible<br>
<br>
'''DAPD''' Descend at Pilot’s Discretion<br>
<br>
'''DASI''' Digital Altimeter Setting Indicator<br>
<br>
'''DATIS''' Data Link Automatic Terminal Information Service<br>
<br>
'''DATIS''' Digital Automatic Terminal Information Service<br>
<br>
'''DB''' Decibel<br>
<br>
'''DB''' Describe<br>
<br>
'''DBA''' Doing Business As<br>
<br>
'''DBASI''' Digital Barometer Altimeter Setting Indicator<br>
<br>
'''DBL''' Double<br>
<br>
'''DBTF''' Doubtful<br>
<br>
'''DC''' Direct Current<br>
<br>
'''DCA''' Defense Communications Acy<br>
<br>
'''DCAVU''' Clear or scattered clouds and visibility greater than ten, remainder of report missing (weather reports only)<br>
<br>
'''DCD''' Double Channel Duplex<br>
<br>
'''DCF''' Deputy Chief<br>
<br>
'''DCKG''' Docking<br>
<br>
'''DCLRT''' Decelerate<br>
<br>
'''DCM''' Defense Combat Maneuvers<br>
<br>
'''DCMSN''' Decommission<br>
<br>
'''DCMT''' Document<br>
<br>
'''DCPC''' Direct Controller Pilot Communications<br>
<br>
'''DCR''' Decrease<br>
<br>
'''DCRZ''' Descend to and Cruise<br>
<br>
'''DCS''' Defense Communications System<br>
<br>
'''DCS''' Double Channel Simplex<br>
<br>
'''DCT''' Direct<br>
<br>
'''DDM''' Difference in Depth of Modulation<br>
<br>
'''DE''' From (used to precede the call sign of the calling station)<br>
<br>
'''DECCO''' Defense Commercial Communications Office<br>
<br>
'''DEF''' Defense<br>
<br>
'''DEFCON''' Defense Readiness Conditions<br>
<br>
'''DEG''' Degree<br>
<br>
'''DELPHO''' Deliver by Telephone<br>
<br>
'''DEMOL''' Demolition<br>
<br>
'''DENEB''' Fog Dispersal Operations<br>
<br>
'''DEP''' Depart<br>
<br>
'''DEP''' Departure<br>
<br>
'''DEPT''' Department<br>
<br>
'''DER''' Departure End of Runway<br>
<br>
'''DES''' Descend to or Descending to<br>
<br>
'''DESTN''' Destination<br>
<br>
'''DETRESFA''' Distress Phase Code Alerting<br>
<br>
'''DEV''' Deviation<br>
<br>
'''DEW''' Distant Early Warning<br>
<br>
'''DEWIZ''' Distant Early Warning Identification Zone<br>
<br>
'''DFCLT''' Difficult<br>
<br>
'''DFDR''' Digital Flight Data Recorder<br>
<br>
'''DFL''' Daily Flight Log<br>
<br>
'''DFNT''' Definite<br>
<br>
'''DFRS''' Differs<br>
<br>
'''DFTI''' Distance From Touchdown Indicator<br>
<br>
'''DFUS''' Diffuse<br>
<br>
'''DGCGO''' Dangerous Cargo<br>
<br>
'''DGNL''' Diagonal<br>
<br>
'''DGR''' Danger<br>
<br>
'''DH''' Decision Height<br>
<br>
'''DI''' Delay Indefinite<br>
<br>
'''DI''' Departure approval request for IFR flight<br>
<br>
'''DIAM''' Diameter<br>
<br>
'''DIF''' Diffuse<br>
<br>
'''DIR''' Director<br>
<br>
'''DISABLD''' Disabled<br>
<br>
'''DISC''' Discontinue<br>
<br>
'''DISEM''' Disseminate<br>
<br>
'''DIST''' Distance<br>
<br>
'''DIST''' District<br>
<br>
'''DISTR''' Distribute<br>
<br>
'''DIV''' Divert<br>
<br>
'''DIV''' Division<br>
<br>
'''DKTS''' Dakotas<br>
<br>
'''DLA''' Delay<br>
<br>
'''DLAC''' Delay Account Of<br>
<br>
'''DLAT''' Delay Time<br>
<br>
'''DLC''' Delay Clearance or Delayed Clearance<br>
<br>
'''DLIC''' Data Link Initiation Capability<br>
<br>
'''DLT''' Delete<br>
<br>
'''DLVR''' Deliver<br>
<br>
'''DLVY''' Delivery<br>
<br>
'''DLY''' Daily<br>
<br>
'''DMAAC''' Defense Mapping Acy Aerospace Center<br>
<br>
'''DMAHC''' Defense Mapping Acy Hydrographic Center<br>
<br>
'''DME''' Distance Measuring Equipment<br>
<br>
'''DME/P''' Precision Distance Measuring Equipment<br>
<br>
'''DMEG''' DME Co-located with Glide Slope<br>
<br>
'''DMEL''' DME Co-located with Localizer<br>
<br>
'''DMER''' DME Tactical air navigation with DME only commissioned<br>
<br>
'''DMEV''' DME Co-located with VOR<br>
<br>
'''DMG''' Damage<br>
<br>
'''DMNT''' Dominant<br>
<br>
'''DMO''' Directives Management Officer<br>
<br>
'''DMSH''' Diminish<br>
<br>
'''DMSTN''' Demonstration<br>
<br>
'''DNA''' Defense Nuclear Agency<br>
<br>
'''DNG''' Danger<br>
<br>
'''DNS''' Dense<br>
<br>
'''DNSLP''' Downslope<br>
<br>
'''DNSTRM''' Downstream<br>
<br>
'''DNWND''' Downwind<br>
<br>
'''DO''' Deputy Commander for Operations<br>
<br>
'''DO''' Ditto<br>
<br>
'''DOB''' Date of Birth<br>
<br>
'''DOC''' Department of Commerce<br>
<br>
'''DOD''' Department of Defense<br>
<br>
'''DOE''' Department of Energy<br>
<br>
'''DOLLY''' Data Link<br>
<br>
'''DOM''' Domestic<br>
<br>
'''DOT''' Department of Transportation<br>
<br>
'''DOT1''' Transport One Secretary of Transportation<br>
<br>
'''DOT2''' Transport Two Deputy Secretary of Transportation<br>
<br>
'''DP''' Deep<br>
<br>
'''DP''' Dew Point<br>
<br>
'''DPCR''' Departure Procedure<br>
<br>
'''DPNG''' Deepening<br>
<br>
'''DPT''' Depth<br>
<br>
'''DPTH''' Depth<br>
<br>
'''DR''' Dead Reckoning<br>
<br>
'''DR''' Direct Route<br>
<br>
'''DR''' Low Drifting<br>
<br>
'''DRCT''' Direct<br>
<br>
'''DRCTN''' Direction<br>
<br>
'''DRDU''' Low Drifting Dust<br>
<br>
'''DRFT''' Drift<br>
<br>
'''DRG''' During<br>
<br>
'''DRIR''' Direct Readout Infrared<br>
<br>
'''DRMS''' Distance Root Mean Square<br>
<br>
'''DRR''' Deployment Readiness Review<br>
<br>
'''DRSA''' Low Drifting Sand<br>
<br>
'''DRSN''' Low Drifting Snow<br>
<br>
'''DRZL''' Drizzle<br>
<br>
'''DS''' Domestic Services (island operations)<br>
<br>
'''DS''' Dust Storm<br>
<br>
'''DSATR''' Descend So as to Reach<br>
<br>
'''DSATX''' Descend So as to Cross<br>
<br>
'''DSB''' Double Sideband<br>
<br>
'''DSCNT''' Descent<br>
<br>
'''DSGND''' Designated<br>
<br>
'''DSIPT''' Dissipate<br>
<br>
'''DSN''' Defense Switching Network<br>
<br>
'''DSND''' Descend<br>
<br>
'''DSNDI''' Descend Immediately<br>
<br>
'''DSNT''' Distant<br>
<br>
'''DSPL''' Display<br>
<br>
'''DSPLC''' Displace<br>
<br>
'''DSPN''' Disposition<br>
<br>
'''DSPRL''' Dispersal<br>
<br>
'''DSR''' Desire<br>
<br>
'''DSRGD''' Disregard<br>
<br>
'''DST''' Distort<br>
<br>
'''DSTC''' Distance<br>
<br>
'''DSTND''' Destined<br>
<br>
'''DTAM''' Descend to and Maintain<br>
<br>
'''DTAX''' Descend to and Cross<br>
<br>
'''DTE''' Data Terminal Equipment<br>
<br>
'''DTF''' Data Transmission Feature<br>
<br>
'''DTG''' Date Time Group<br>
<br>
'''DTHR''' Displaced Runway Threshold<br>
<br>
'''DTL''' Detail<br>
<br>
'''DTLN''' International Dateline<br>
<br>
'''DTR''' Data Transmission Request<br>
<br>
'''DTRM''' Determine<br>
<br>
'''DTRT''' Deteriorate<br>
<br>
'''DTS''' Diplomatic Telecommunications Service<br>
<br>
'''DTW''' Dual Tandem Wheels<br>
<br>
'''DU''' Widespread Dust<br>
<br>
'''DUATS''' Direct User Access Terminal System<br>
<br>
'''DUC''' Dense Upper Cloud<br>
<br>
'''DUPE''' Duplicate<br>
<br>
'''DUPE''' Duplicate Message<br>
<br>
'''DUR''' Duration<br>
<br>
'''DURC''' During Climb<br>
<br>
'''DURD''' During Descent<br>
<br>
'''DURG''' During<br>
<br>
'''DURN''' Duration<br>
<br>
'''DV''' Distinguished Visitors<br>
<br>
'''DVFR''' Day Visual Flight Rules<br>
<br>
'''DVFR''' Defense Visual Flight Rules<br>
<br>
'''DVLP''' Develop<br>
<br>
'''DVOLMET''' Data Link<br>
<br>
'''DVOR''' Doppler VHF Omnidirectional Radio Range<br>
<br>
'''DVRG''' Diverge<br>
<br>
'''DVRSN''' Diversion<br>
<br>
'''DVV''' Downward Vertical Velocity<br>
<br>
'''DW''' Dual Wheels<br>
<br>
'''DWG''' Drawing<br>
<br>
'''DWNDFTS''' Downdrafts<br>
<br>
'''DWPNT''' Dew Point<br>
<br>
'''DWRC''' Descend Well to Right of Course<br>
<br>
'''DWTR''' Descend Well to Right<br>
<br>
'''DX''' Duplex<br>
<br>
'''DZ''' Drizzle<br>
<br>
</div>
 
== E ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''E''' East or Eastern longitude<br>
<br>
'''E''' Eastern Standard Time (time groups only)<br>
<br>
'''E''' Ending of precipitation (time in minutes) (weather reports only)<br>
<br>
'''E''' Equatorial (air mass)<br>
<br>
'''E/G''' Engineerator<br>
<br>
'''E/R''' Exchange and Repair<br>
<br>
'''EACLN''' Expect Approach Clearance<br>
<br>
'''EACNL''' Expect Approach Clearance Not Later Than<br>
<br>
'''EADIZ''' Entering Air Defense Identification Zone<br>
<br>
'''EARTS''' En Route Automated Radar Tracking System<br>
<br>
'''EAS''' Equivalent Airspeed<br>
<br>
'''EAT''' Expected Approach Time<br>
<br>
'''EB''' Eastbound<br>
<br>
'''EBND''' Eastbound<br>
<br>
'''ECA''' Enter Control Area<br>
<br>
'''ECAS''' Enter Controlled Airspace<br>
<br>
'''ECD''' Except Change Departure to Read<br>
<br>
'''ECM''' Electronic Counter Measures<br>
<br>
'''ECMSN''' Electronic Counter Measure Mission<br>
<br>
'''ECOM''' En Route Communications<br>
<br>
'''ECR''' Except Change Route to Read<br>
<br>
'''ECSP''' Electronic Specialist<br>
<br>
'''EDA''' Early Departure Authorized<br>
<br>
'''EDC''' Expect Departure Clearance At<br>
<br>
'''EDCT''' Estimated Departure Clearance<br>
<br>
'''EDR''' Expect Departure Release At<br>
<br>
'''EEE''' Error (to be used in AFS as a procedure signal)<br>
<br>
'''EEM''' Electronic Equipment Modification<br>
<br>
'''EENGR''' Electrical Engineer<br>
<br>
'''EEP''' End Exercise Point<br>
<br>
'''EET''' Estimated Elapsed Time<br>
<br>
'''EFA''' Entire Field Available<br>
<br>
'''EFAS''' En Route Flight Advisory Service<br>
<br>
'''EFC''' Expect Further Clearance At<br>
<br>
'''EFCT''' Effect<br>
<br>
'''EFF''' Effective<br>
<br>
'''EFR''' Expect Further Routing<br>
<br>
'''EFTO''' Encrypt for Transmission Only<br>
<br>
'''EG''' Emergency Gear<br>
<br>
'''EGECON''' Electronic Geographic Coordinator Navigation System<br>
<br>
'''EHA''' Expect Higher Altitude<br>
<br>
'''EHF''' Extremely High Frequency (30000 to 300000 MHz)<br>
<br>
'''EIT''' Electronic Installation Technician<br>
<br>
'''ELAT''' Estimated Latitude<br>
<br>
'''ELBA''' Emergency Location Beacon Aircraft<br>
<br>
'''ELEC''' Electric<br>
<br>
'''ELECN''' Electrician<br>
<br>
'''ELEV''' Elevate or elevation<br>
<br>
'''ELIP''' Elliptical<br>
<br>
'''ELMT''' Electronic Mechanic Technician<br>
<br>
'''ELNGT''' Elongate<br>
<br>
'''ELONG''' Estimated Longitude<br>
<br>
'''ELR''' Extra Long Range<br>
<br>
'''ELSW''' Elsewhere<br>
<br>
'''ELT''' Emergency Locator Transmitter<br>
<br>
'''EM''' Emission<br>
<br>
'''EMBD''' Embedded (in cloud layer)<br>
<br>
'''EMBDD''' Embedded<br>
<br>
'''EMDO''' Engineering and Manufacturing District Office<br>
<br>
'''EMERG''' Emergency<br>
<br>
'''EMI''' Electronic Maintenance Inspector<br>
<br>
'''EMSU''' Environment Meteorological Support Unit<br>
<br>
'''EMT''' Electronic Maintenance Technician<br>
<br>
'''ENCTR''' Encounter<br>
<br>
'''END''' Stopend (related to RVR)<br>
<br>
'''ENDCE''' Endurance<br>
<br>
'''ENDG''' Ending<br>
<br>
'''ENE''' East North East<br>
<br>
'''ENERN''' East North Eastern (weather reports only)<br>
<br>
'''ENEWD''' East North Eastward (weather reports only)<br>
<br>
'''ENG''' Engine<br>
<br>
'''ENGR''' Engineer<br>
<br>
'''ENHNCD''' Enhanced<br>
<br>
'''ENHNCMNT''' Enhancement<br>
<br>
'''ENR''' Enroute<br>
<br>
'''ENRC''' Enroute Chart (followed by name/ title)<br>
<br>
'''ENRT''' En Route<br>
<br>
'''ENTR''' Entire<br>
<br>
'''EOBT''' Estimated Off Block Time<br>
<br>
'''EOD''' Entered On Duty<br>
<br>
'''EOF''' Expected Operations Forecast<br>
<br>
'''EP''' En Route Penetration<br>
<br>
'''EPI''' Expanded Position Indicator<br>
<br>
'''EQCRT''' Equipment Certified<br>
<br>
'''EQPT''' Equipment<br>
<br>
'''EQUIP''' Equipment<br>
<br>
'''ER''' Here<br>
<br>
'''ERAD''' En Route Radar (broadband)<br>
<br>
'''ERMG''' En Route Metering<br>
<br>
'''ERSP''' En Route Spacing Program<br>
<br>
'''ERY''' Early<br>
<br>
'''ESCAT''' Emergency Security Control of Air Traffic<br>
<br>
'''ESE''' East South East<br>
<br>
'''ESEC''' En Route Secondary Radar Beacon<br>
<br>
'''ESERN''' East South Eastern<br>
<br>
'''ESEWD''' East South Eastward<br>
<br>
'''ESNTL''' Essential<br>
<br>
'''ESP''' En Route Sequencing Program<br>
<br>
'''EST''' Estimate or estimation<br>
<br>
'''ESTAB''' Establish<br>
<br>
'''ESV''' Expanded Service Volume<br>
<br>
'''ET''' Electronic Technician<br>
<br>
'''ETA''' Estimated Time of Arrival<br>
<br>
'''ETARS''' En route tracking automatic radar service<br>
<br>
'''ETC''' Et Cetera<br>
<br>
'''ETD''' Estimated Time of Departure<br>
<br>
'''ETE''' Estimated Time En Route<br>
<br>
'''ETFL''' Each Thousand Foot Level<br>
<br>
'''ETI''' Estimated Information<br>
<br>
'''ETIM''' Elapsed Time<br>
<br>
'''ETO''' Estimated Time Over Significant Point<br>
<br>
'''ETOV''' Estimated Time Over<br>
<br>
'''ETP''' Estimated Time of Penetration<br>
<br>
'''ETR''' Eastern Test Range<br>
<br>
'''EU''' Electronic Unit<br>
<br>
'''EUO''' Emergency Use Only<br>
<br>
'''EV''' Every<br>
<br>
'''EVAC''' Evacuation<br>
<br>
'''EVAL''' Evaluate or evaluation<br>
<br>
'''EVE''' Evening<br>
<br>
'''EVS''' Electronic Voice Switching System<br>
<br>
'''EVT''' Expect Vector To<br>
<br>
'''EXAM''' Examination<br>
<br>
'''EXC''' Except<br>
<br>
'''EXCH''' Exchange<br>
<br>
'''EXCLD''' Exclude<br>
<br>
'''EXCLV''' Exclusive<br>
<br>
'''EXCP''' Except<br>
<br>
'''EXCT''' Execute<br>
<br>
'''EXDLVY''' Expedite Delivery<br>
<br>
'''EXEC''' Executive<br>
<br>
'''EXEC1''' President on board civil aircraft<br>
<br>
'''EXEC1F''' President’s family is aboard aircraft<br>
<br>
'''EXEC2''' Vice President is aboard civil aircraft<br>
<br>
'''EXEC2F''' Vice President’s family is aboard aircraft<br>
<br>
'''EXER''' Exercise<br>
<br>
'''EXP''' Expect<br>
<br>
'''EXPC''' Expect<br>
<br>
'''EXPED''' Expedite<br>
<br>
'''EXPHO''' Expedite Delivery by Telephone<br>
<br>
'''EXPS''' Express<br>
<br>
'''EXQF''' Expanded Quota Flow<br>
<br>
'''EXREP''' Expedite Mail Reply<br>
<br>
'''EXSEC''' Extra Section<br>
<br>
'''EXSHI''' Expedite Shipment<br>
<br>
'''EXTD''' Extend<br>
<br>
'''EXTN''' Extension<br>
<br>
'''EXTRAP''' Extrapolate<br>
<br>
'''EXTRM''' Extreme<br>
<br>
'''EXTSV''' Extensive<br>
<br>
</div>
 
== F ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''F''' Cleared to fix<br>
<br>
'''F''' Fahrenheit<br>
<br>
'''F''' Flight Inspection<br>
<br>
'''FA''' Area Forecast<br>
<br>
'''FA''' CENTER Aviation Area Forecast Center<br>
<br>
'''FA''' Final Approach<br>
<br>
'''FA''' Fuel Advisory<br>
<br>
'''FAA''' Federal Aviation Administration<br>
<br>
'''FAA''' For an Approach To<br>
<br>
'''FAA1''' SafeAir OneFederal Aviation Administration Administrator<br>
<br>
'''FAA2''' SafeAir TwoFederal Aviation Administration Deputy Administrator<br>
<br>
'''FAAP''' Federal Aid to Airports Program<br>
<br>
'''FAC''' Facility<br>
<br>
'''FACF''' Facility Chief<br>
<br>
'''FACSFAC''' Fleet Area Controlled and Surveillance Facility<br>
<br>
'''FAD''' Fuel Advisory Departure<br>
<br>
'''FAF''' Final Approach Fix<br>
<br>
'''FAFAB''' FSS Assumes Flightplan Area and Service B<br>
<br>
'''FAH''' Fahrenheit<br>
<br>
'''FAL''' Facilitation of International Air Transport<br>
<br>
'''FAM''' Familiar or familiarization<br>
<br>
'''FAMAE''' Following Amendment Authorized Effective<br>
<br>
'''FAP''' Final Approach Point<br>
<br>
'''FAR''' Federal Aviation Regulations<br>
<br>
'''FATFL''' FSS Assumes Control of Tower Frequencies and Lights<br>
<br>
'''FAX''' Facsimile<br>
<br>
'''FBO''' Fixed Base Operator<br>
<br>
'''FC''' Funnel Cloud<br>
<br>
'''FCA''' Frequency Change Approved<br>
<br>
'''FCC''' Federal Communications Commission<br>
<br>
'''FCFSS'''  Contract Flight Service Station<br>
<br>
'''FCO''' Facility Coordination Officer<br>
<br>
'''FCRP''' Field Condition Report<br>
<br>
'''FCST''' Forecast<br>
<br>
'''FCTA''' Flow Control Time of Arrival<br>
<br>
'''FCWOS'''  Contract Weather Observing Station<br>
<br>
'''FDAT''' Flight Data<br>
<br>
'''FDC''' Flight Data Center<br>
<br>
'''FDDL''' Frequency Division Data Link<br>
<br>
'''FDEP''' Flight Data Entry and Printout<br>
<br>
'''FDI''' Fault Detection and Isolation<br>
<br>
'''FDIO''' Flight Data Input/Output<br>
<br>
'''FDIOR''' Flight Data Input/Output Repeater<br>
<br>
'''FDPS''' Flight Data Processing System<br>
<br>
'''FE''' Flight Engineer<br>
<br>
'''FENKN''' Fuel Supply Unknown<br>
<br>
'''FENTL''' Fuel Supply Until<br>
<br>
'''FEW''' Cloud Coverage 1/8th to 1/4th of sky<br>
<br>
'''FEXHA''' Fuel Supply Exhausted<br>
<br>
'''FFC''' For Further Clearance<br>
<br>
'''FFLT''' Familiarization Flight<br>
<br>
'''FFMN''' Fixed Federal Monitoring Network<br>
<br>
'''FFR''' Fire Fighting<br>
<br>
'''FG''' Fog<br>
<br>
'''FGSB''' FSS Guarding Service B<br>
<br>
'''FI/P''' Flight Information (permanent)<br>
<br>
'''FI/T''' Flight Information (temporary)<br>
<br>
'''FIBI''' Filed But Impracticable to Transmit<br>
<br>
'''FIC''' Flight Information Center<br>
<br>
'''FICON''' Field Condition<br>
<br>
'''FIDO''' Flight Inspection District Office<br>
<br>
'''FIFO''' Flight Inspection Field Office<br>
<br>
'''FIFOH''' Flight Inspection Field Office High Altitude<br>
<br>
'''FIFP''' Filed IFR Flight Plan<br>
<br>
'''FIG''' Figure<br>
<br>
'''FIG''' Flight Inspection Group<br>
<br>
'''FIL''' Filament<br>
<br>
'''FILG''' Filling<br>
<br>
'''FILS''' Florescan Instrument Landing System<br>
<br>
'''FINO''' Weather report will not be filed for transmission<br>
<br>
'''FIR''' Flight Information Region<br>
<br>
'''FIRAV''' First Available<br>
<br>
'''FIRB''' Flight Information Region Boundary<br>
<br>
'''FIRG''' Firing<br>
<br>
'''FIRIV''' Arrival report will be filed with<br>
<br>
'''FIS''' Flight Information Service<br>
<br>
'''FISA''' Automated flight information service<br>
<br>
'''FL''' Flash Advisory<br>
<br>
'''FL''' Flight Level<br>
<br>
'''FLCTN''' Fluctuation<br>
<br>
'''FLD''' Field<br>
<br>
'''FLDST''' Flood Stage<br>
<br>
'''FLG''' Falling<br>
<br>
'''FLG''' Flashing<br>
<br>
'''FLIDAP''' Flight Data Position<br>
<br>
'''FLIP''' Flight Information Publication<br>
<br>
'''FLORL''' Fluorescent Runway Lighting (floodlight system)<br>
<br>
'''FLR''' Flares<br>
<br>
'''FLRY''' Flurry<br>
<br>
'''FLT''' Flight<br>
<br>
'''FLTCK''' Flight Check<br>
<br>
'''FLTO''' Flight Orders<br>
<br>
'''FLTWO''' Flight Watch Outlet<br>
<br>
'''FLUC''' Fluctuating<br>
<br>
'''FLW''' Follow<br>
<br>
'''FLWIS''' Flood Warning Issued<br>
<br>
'''FM''' Fan Marker<br>
<br>
'''FM''' From<br>
<br>
'''FMAP''' Fan Marker Approach<br>
<br>
'''FMH''' Fan Marker Located with Radio Beacon<br>
<br>
'''FMO''' Frequency Management Officer<br>
<br>
'''FMS''' Flight Management System<br>
<br>
'''FMT''' Format<br>
<br>
'''FMU''' Flow Management Unit<br>
<br>
'''FNA''' Final Approach<br>
<br>
'''FNCTN''' Function<br>
<br>
'''FNT''' Front<br>
<br>
'''FNTGNS''' Frontoesis<br>
<br>
'''FNTLYS''' Frontolysis<br>
<br>
'''FOB''' Fuel On Board<br>
<br>
'''FOD''' Foreign Object Debris<br>
<br>
'''FONE''' Telephone<br>
<br>
'''FORNN''' Forenoon<br>
<br>
'''FP''' Flight Plan<br>
<br>
'''FPA''' Flight Plan Area<br>
<br>
'''FPB''' Flight Progress Board<br>
<br>
'''FPDI''' Flight Path Deviation Indicator<br>
<br>
'''FPL''' Filed Flight Plan<br>
<br>
'''FPL''' Full Performance Level<br>
<br>
'''FPM''' Feet Per Minute<br>
<br>
'''FPN''' Fixed Pulse Radar Navigation Aid<br>
<br>
'''FPNO''' Flight Plan Not Received<br>
<br>
'''FPP''' From Present Position<br>
<br>
'''FPR''' Flight Plan Route<br>
<br>
'''FPRC''' For Possible Reclearance<br>
<br>
'''FPWA''' Further Particulars When Available<br>
<br>
'''FQT''' Frequent<br>
<br>
'''FR''' Fuel Remaining<br>
<br>
'''FRC''' Full Route Clearance<br>
<br>
'''FRD''' Fix Radial Distance<br>
<br>
'''FREQ''' Frequency<br>
<br>
'''FRFAB''' FSS Returns Flight Plan Area and Service B<br>
<br>
'''FRH''' Fly Runway Heading<br>
<br>
'''FRM''' Form<br>
<br>
'''FRMG''' Forming<br>
<br>
'''FRMN''' Formation<br>
<br>
'''FRNG''' Firing<br>
<br>
'''FROPA''' Frontal Passage<br>
<br>
'''FROSFC''' Frontal Surface<br>
<br>
'''FRQ''' Frequent<br>
<br>
'''FRSB''' FSS Returns Service B<br>
<br>
'''FRST''' Frost<br>
<br>
'''FRTFL''' FSS Returns Control of Tower Frequencies and Lights<br>
<br>
'''FRWF''' Forecast Wind Factor<br>
<br>
'''FRZ''' Freeze<br>
<br>
'''FRZLVL''' Freezing Level<br>
<br>
'''FRZN''' Frozen<br>
<br>
'''FSDO''' Flight Standards District Office<br>
<br>
'''FSL''' Full Stop Landing<br>
<br>
'''FSM''' Flight Schedule Monitor<br>
<br>
'''FSNFO''' Flight Standards National Field Office<br>
<br>
'''FSP''' Flight Strip Printer<br>
<br>
'''FSS''' Flight Service Station<br>
<br>
'''FT''' Feet<br>
<br>
'''FT''' Filing Time<br>
<br>
'''FT''' Foot<br>
<br>
'''FTAR''' Following Transmitted as Received (message handling)<br>
<br>
'''FTHR''' Farther or further<br>
<br>
'''FTHRD''' Feathered<br>
<br>
'''FTS''' Federal Telecommunications System<br>
<br>
'''FU''' Smoke<br>
<br>
'''FURN''' Furnish<br>
<br>
'''FV''' Forward Visibility (miles)<br>
<br>
'''FVFP''' Filed VFR Flight Plan<br>
<br>
'''FW/SIFR''' Fixed Wing Special IFR<br>
<br>
'''FW/SVFR''' Fixed Wing Special VFR<br>
<br>
'''FWA''' Flight Watch Area<br>
<br>
'''FWC''' Fleet Weather Central<br>
<br>
'''FWCS''' Flight Watch Control Station<br>
<br>
'''FWD''' Forward<br>
<br>
'''FWDC''' Forward Collect<br>
<br>
'''FWP''' Flight Watch Point<br>
<br>
'''FWRNG''' Fire Warning<br>
<br>
'''FWS''' Flight Watch Specialist<br>
<br>
'''FWU''' Flight Watch Unit<br>
<br>
'''FYI''' For Your Information<br>
<br>
'''FZ''' Supercooled/freezing<br>
<br>
'''FZDZ''' Freezing Drizzle<br>
<br>
'''FZFG''' Freezing Fog<br>
<br>
'''FZRA''' Freezing Rain<br>
<br>
'''FZRANO''' Freezing Rain Sensor Not Available<br>
<br>
</div>
 
== G ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''G''' Green<br>
<br>
'''G''' Gusts reaching (knots) (weather reports only)<br>
<br>
'''G/A''' Ground to Air<br>
<br>
'''G/A/G''' Ground to Air and Air to Ground<br>
<br>
'''GA''' General Aviation<br>
<br>
'''GA''' Glide Angle<br>
<br>
'''GA''' Go ahead resume sending (to be used in AFS as a procedure signal)<br>
<br>
'''GADO''' General Aviation District Office<br>
<br>
'''GALS''' Gallons<br>
<br>
'''GBA''' Give Better Address<br>
<br>
'''GBAS''' Ground Based Augmentation System<br>
<br>
'''GBL''' Government Bill of Landing<br>
<br>
'''GBR''' Give Better Reference<br>
<br>
'''GC''' Ground Control<br>
<br>
'''GCA''' Ground Control Approach<br>
<br>
'''GCI''' Ground Control Intercept<br>
<br>
'''GCO''' Ground Communication Outlet<br>
<br>
'''GDP''' Ground Delay Program<br>
<br>
'''GDPGM''' Ground Delay Program<br>
<br>
'''GEO''' Geographic<br>
<br>
'''GEOREF''' Geographical Reference<br>
<br>
'''GES''' Ground Earth Station<br>
<br>
'''GHZ''' Gigahertz<br>
<br>
'''GIC''' GPS Integrity Channel<br>
<br>
'''GICG''' Glaze Icing<br>
<br>
'''GLD''' Glider<br>
<br>
'''GLDR''' Glider<br>
<br>
'''GLFALSK''' Gulf of Alaska<br>
<br>
'''GLFCAL''' Gulf of California<br>
<br>
'''GLFMEX''' Gulf of Mexico<br>
<br>
'''GLFSTLAWR''' Gulf of St Lawrence<br>
<br>
'''GLONASS''' Global Orbiting Navigation Satellite System<br>
<br>
'''GLS''' GBAS Landing System<br>
<br>
'''GMC''' Ground Movement Chart (followed by name/title)<br>
<br>
'''GMT''' Greenwich Mean Time<br>
<br>
'''GND''' Ground<br>
<br>
'''GNDCK''' Ground Check<br>
<br>
'''GNDFG''' Ground Fog<br>
<br>
'''GNSS''' Global Navigation Satellite System (in general)<br>
<br>
'''GNTR''' Generator<br>
<br>
'''GOV''' Governor<br>
<br>
'''GOVT''' Government<br>
<br>
'''GP''' Glide Path<br>
<br>
'''GPI''' Ground Point of Intercept<br>
<br>
'''GPS''' Global Positioning System<br>
<br>
'''GQA''' Get Quick Answer<br>
<br>
'''GR''' Hail (greater than 3/4”)<br>
<br>
'''GRAD''' Gradient<br>
<br>
'''GRADU''' Gradual<br>
<br>
'''GRASS''' Grass landing area<br>
<br>
'''GRBL''' Garble<br>
<br>
'''GRBNKS''' Grand Banks<br>
<br>
'''GRDL''' Gradual<br>
<br>
'''GRID''' Grid point values of processed meteorological data<br>
<br>
'''GRTLKS''' Great Lakes<br>
<br>
'''GRVL''' Gravel<br>
<br>
'''GS''' Glide Slope<br>
<br>
'''GS''' Ground Speed<br>
<br>
'''GS''' Ground Stop<br>
<br>
'''GS''' Snow pellets/small hail (less than 1/4”)<br>
<br>
'''GSA''' General Services Administration<br>
<br>
'''GSDO''' General Safety District Office<br>
<br>
'''GSI''' General Safety Inspector<br>
<br>
'''GSTS''' Gusts<br>
<br>
'''GSTY''' Gusty<br>
<br>
'''GTC''' Gain Time Control<br>
<br>
'''GTCL''' Great Circle<br>
<br>
'''GTR''' Greater<br>
<br>
'''GUND''' Geoid Undulation<br>
<br>
'''GV''' Ground Visibility<br>
<br>
'''GVG''' Giving<br>
<br>
'''GVH''' Government Vehicle<br>
<br>
'''GWT''' Gross Weight<br>
<br>
</div>
 
== H ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''H24''' Continuous 24 hour service<br>
<br>
'''HAA''' Height Above Airport<br>
<br>
'''HADA''' Hawaiian Defense Area<br>
<br>
'''HADD''' Hawaiian Air Defense Division<br>
<br>
'''HADIZ''' Hawaiian Air Defense Identification Zone<br>
<br>
'''HAL''' Height Above Landing<br>
<br>
'''HANG''' Hawaiian Air National Guard<br>
<br>
'''HAPI''' Holding as Previously Instructed<br>
<br>
'''HARS''' Hazardous Area Reporting Service<br>
<br>
'''HAT''' Height Above Touchdown<br>
<br>
'''HAZ''' Hazard<br>
<br>
'''HAZMAT''' Hazardous Material<br>
<br>
'''HB''' Homing Beacon<br>
<br>
'''HBN''' Hazard Beacon<br>
<br>
'''HCVIS''' High Clouds Visible<br>
<br>
'''HDATZ''' High Density Traffic Zones<br>
<br>
'''HDF''' High Frequency Direction Finding Station<br>
<br>
'''HDFRZ''' Hard Freeze<br>
<br>
'''HDG''' Heading<br>
<br>
'''HDOP''' Horizontal Dilution of Precision<br>
<br>
'''HDSVLY''' Hudson Valley<br>
<br>
'''HDTA''' High Density Traffic Airport<br>
<br>
'''HDWND''' Headwind<br>
<br>
'''HEAD''' Head of State Status<br>
<br>
'''HEL''' Helicopter<br>
<br>
'''HELI''' Heliport<br>
<br>
'''HF''' High Frequency<br>
<br>
'''HFR''' Hold for Release<br>
<br>
'''HGT''' Height<br>
<br>
'''HHE''' Household Effects<br>
<br>
'''HI''' High<br>
<br>
'''HIALS''' High Intensity Approach Light System<br>
<br>
'''HIBAL''' High Altitude Balloon<br>
<br>
'''HIEAT''' Highest Temperature Equaled for all Time<br>
<br>
'''HIEFM''' Highest Temperature Equaled for the Month<br>
<br>
'''HIESE''' Highest Temperature Equaled so Early<br>
<br>
'''HIESL''' Highest Temperature Equaled so Late<br>
<br>
'''HIFOR''' High Level Forecast<br>
<br>
'''HIRIV''' How will arrival report be filed concerning<br>
<br>
'''HIRL''' High Intensity Runway Lights<br>
<br>
'''HITMP''' Highest Temperature<br>
<br>
'''HIWAS''' Hazardous Inflight Weather Advisory Service<br>
<br>
'''HIXAT''' Highest Temperature Exceeded for all Time<br>
<br>
'''HIXFM''' Highest Temperature Exceeded for the Month<br>
<br>
'''HIXSE''' Highest Temperature Exceeded so Early<br>
<br>
'''HIXSL''' Highest Temperature Exceeded so Late<br>
<br>
'''HJ''' Sunrise to sunset<br>
<br>
'''HLDG''' Holding<br>
<br>
'''HLF''' Half<br>
<br>
'''HLSTO''' Hailstones<br>
<br>
'''HLTP''' Hilltop<br>
<br>
'''HN''' Sunset to sunrise<br>
<br>
'''HND''' Hundred<br>
<br>
'''HNGR''' Hangar<br>
<br>
'''HO''' Service available to meet operational requirements<br>
<br>
'''HOL''' Holiday<br>
<br>
'''HOP''' Handoff Point<br>
<br>
'''HOP''' Helicopter Operations<br>
<br>
'''HOSP''' Hospital Aircraft<br>
<br>
'''HOW''' Handover Word<br>
<br>
'''HP''' Holding Pattern<br>
<br>
'''HPA''' Hectopascal<br>
<br>
'''HQ''' Headquarters<br>
<br>
'''HR''' Here<br>
<br>
'''HR''' Hour<br>
<br>
'''HRZN''' Horizon<br>
<br>
'''HS''' Service available during scheduled operations<br>
<br>
'''HTN''' Heterodyne<br>
<br>
'''HTR''' Heater<br>
<br>
'''HUM''' Humanitarian Mission<br>
<br>
'''HURCN''' Hurricane<br>
<br>
'''HUREP''' Hurricane Report<br>
<br>
'''HV''' High Voltage<br>
<br>
'''HVDF''' High and very high frequency direction finding stations<br>
<br>
'''HVY''' Heavy<br>
<br>
'''HWVR''' However<br>
<br>
'''HWY''' Highway<br>
<br>
'''HX''' High Index<br>
<br>
'''HX''' No specific working hours<br>
<br>
'''HYD''' Hydraulic<br>
<br>
'''HYDRO''' Hydrographic<br>
<br>
'''HYR''' Higher<br>
<br>
'''HZ''' Haze<br>
<br>
'''Hz''' Hertz<br>
<br>
</div>
 
== I ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''I/IFR''' Intermittent Instruments<br>
<br>
'''IAARC''' International Administrative Aeronautical Radio Conference<br>
<br>
'''IAC''' Instrument Approach Chart<br>
<br>
'''IAD''' If Authorized DME May be Used<br>
<br>
'''IAF''' Initial Approach Fix<br>
<br>
'''IAO''' In and out of clouds<br>
<br>
'''IAP''' Instrument Approach Procedure<br>
<br>
'''IAR''' Intersection of Air Routes<br>
<br>
'''IAS''' Indicated Air Speed<br>
<br>
'''IATA''' International Air Transport Association<br>
<br>
'''IATSC''' International Aeronautical Telecommunications Switching Center<br>
<br>
'''IAW''' In Accordance With<br>
<br>
'''IBASF''' Intervals Between Aircraft in Stream Type Formation<br>
<br>
'''IBN''' Identification Beacon<br>
<br>
'''IBND''' Inbound<br>
<br>
'''IC''' Ice Crystals<br>
<br>
'''IC''' Icing (PIREP only)<br>
<br>
'''ICAO''' International Civil Aviation Organization<br>
<br>
'''ICD''' Interface Control Document<br>
<br>
'''ICG''' Icing<br>
<br>
'''ICGIC''' Icing in Clouds<br>
<br>
'''ICGICIP''' Icing in Clouds and Precipitation<br>
<br>
'''ICGIP''' Icing in Precipitation<br>
<br>
'''ID''' Identify or identifier<br>
<br>
'''IDAT''' Interfacility Data<br>
<br>
'''IDENT''' Identification<br>
<br>
'''IDP''' Individual Development Plan<br>
<br>
'''IF''' Intermediate approach fix<br>
<br>
'''IF''' Intermediate Fix<br>
<br>
'''IFAMP''' If Approach Missed Proceed<br>
<br>
'''IFF''' Identification Friend/Foe<br>
<br>
'''IFHOL''' If Holding<br>
<br>
'''IFIM''' International Flight Information Manual<br>
<br>
'''IFINS''' If Instrument Conditions Encountered<br>
<br>
'''IFO''' International Field Office<br>
<br>
'''IFO''' Interphone<br>
<br>
'''IFONO''' Interphone (service F) not operative<br>
<br>
'''IFORO''' Interphone (service F) resumed operation<br>
<br>
'''IFPFP''' Individual Flight Plans from this Point<br>
<br>
'''IFR''' Instrument Flight Rules<br>
<br>
'''IFSS''' International Flight Service Station<br>
<br>
'''IFUN''' If Unable<br>
<br>
'''IFVLS''' If Flight Visibility Becomes Less Than<br>
<br>
'''IFVR''' If Visibility Remains<br>
<br>
'''IGA''' International General Aviation<br>
<br>
'''IGIA''' Interacy Group on International Aviation<br>
<br>
'''IIA''' If incorrect Advise<br>
<br>
'''IISD''' If incorrect Service Direct<br>
<br>
'''ILAS''' Instrument Low Approach<br>
<br>
'''ILS''' Instrument Landing System<br>
<br>
'''ILSP''' Instrument Landing System Partial<br>
<br>
'''IM''' Inner Marker<br>
<br>
'''IMAP''' Immediately After Passing<br>
<br>
'''IMC''' Instrument Meteorological Conditions<br>
<br>
'''IMDT''' Immediate<br>
<br>
'''IMF''' Interrogation Sign<br>
<br>
'''IMG''' Immigration<br>
<br>
'''IMI''' Intensity Unknown<br>
<br>
'''IMP''' Impracticable<br>
<br>
'''IMPL''' Impulse<br>
<br>
'''IMPR''' Improve<br>
<br>
'''IMPT''' Important<br>
<br>
'''IMT''' Immediate or immediately<br>
<br>
'''IN''' Inch<br>
<br>
'''INA''' Initial Approach<br>
<br>
'''INADQT''' Inadequate<br>
<br>
'''INATS''' Interruption of Air Traffic Services<br>
<br>
'''INBD''' Inbound<br>
<br>
'''INC''' In Clouds<br>
<br>
'''INC''' Incorporated<br>
<br>
'''INCERFA''' Uncertainty phase code (alerting service)<br>
<br>
'''INCL''' Include<br>
<br>
'''INCLV''' Inclusive<br>
<br>
'''INCOMP''' Incomplete<br>
<br>
'''INCOR''' Incorrect<br>
<br>
'''INCR''' Increase<br>
<br>
'''INDC''' Indicate<br>
<br>
'''INDEF''' Indefinite<br>
<br>
'''INDUS''' Industrial<br>
<br>
'''INF''' Inland Navigation Facility<br>
<br>
'''INFO''' Information<br>
<br>
'''INIT''' Initial Training<br>
<br>
'''INLD''' Inland<br>
<br>
'''INOF''' If not off<br>
<br>
'''INOP''' Inoperative<br>
<br>
'''INP''' If Not Possible<br>
<br>
'''INPR''' In Progress<br>
<br>
'''INREQ''' Information Request<br>
<br>
'''INS''' Inertial Navigation System<br>
<br>
'''INSP''' Inspect<br>
<br>
'''INST''' Instrument<br>
<br>
'''INSTA''' Instruments Authorized<br>
<br>
'''INSTA''' Interstate<br>
<br>
'''INSTBY''' Instability<br>
<br>
'''INSTL''' Install<br>
<br>
'''INSTR''' Instruct<br>
<br>
'''INSTR''' Instrument<br>
<br>
'''INSUF''' Insufficient Scheduled Time Available<br>
<br>
'''INSUF''' Unable to Finish<br>
<br>
'''INT''' Intersection<br>
<br>
'''INTCNTL''' Intercontinental<br>
<br>
'''INTCP''' Intercept<br>
<br>
'''INTD''' Intend<br>
<br>
'''INTER''' Intermittent<br>
<br>
'''INTFC''' Interference<br>
<br>
'''INTL''' International<br>
<br>
'''INTMD''' Intermediate<br>
<br>
'''INTMT''' Intermittent<br>
<br>
'''INTNS''' Intentions<br>
<br>
'''INTR''' Interior<br>
<br>
'''INTRG''' Interrogator<br>
<br>
'''INTRMTRGN''' InterMountain Region<br>
<br>
'''INTRP''' Interrupt<br>
<br>
'''INTS''' Intense<br>
<br>
'''INTSF''' Intensify or intensifying<br>
<br>
'''INTSFY''' Intensify<br>
<br>
'''INTST''' Intensity<br>
<br>
'''INTVL''' Interval<br>
<br>
'''INTXN''' Intersection<br>
<br>
'''INVES''' Investigate<br>
<br>
'''INVOF''' In the Vicinity Of<br>
<br>
'''INVRN''' Inversion<br>
<br>
'''INVSTAR''' Investigate and report<br>
<br>
'''IOVC''' In Overcast<br>
<br>
'''IP''' Initial Point<br>
<br>
'''IP''' Instructor Pilot<br>
<br>
'''IP/HHCL''' Initial Point/Hour Control Line<br>
<br>
'''IPV''' Improve<br>
<br>
'''IR''' Ice on Runway<br>
<br>
'''IR''' IFR Military training route<br>
<br>
'''IRAC''' Interdepartmental Radio Advisory Committee<br>
<br>
'''IRAD''' Inbound Radial<br>
<br>
'''IREG''' Irregular<br>
<br>
'''IRN''' Interface Revision Notices<br>
<br>
'''IS''' Island<br>
<br>
'''ISA''' International Standard Atmosphere<br>
<br>
'''ISB''' Independent Sideband<br>
<br>
'''ISMGR''' Island Manager<br>
<br>
'''ISMLS''' Interim Standard Microwave Landing System<br>
<br>
'''ISOL''' Isolate<br>
<br>
'''ITCK''' Issue Time Check<br>
<br>
'''ITNRNT''' Itinerant<br>
<br>
'''ITRY''' Itinerary<br>
<br>
'''ITU''' International Telecommunications Union<br>
<br>
'''IVFRC''' In VFR Conditions<br>
<br>
</div>
 
== J ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''JAL''' Jet Approach Landing Charts<br>
<br>
'''JATO''' Jet Assisted Takeoff<br>
<br>
'''JAWYS''' Join Airways<br>
<br>
'''JBAR''' Jet Runway Barrier<br>
<br>
'''JCTN''' Junction<br>
<br>
'''JOUR''' Journeyman<br>
<br>
'''JP''' Jet Penetration<br>
<br>
'''JPAP''' Jet Penetration Approach<br>
<br>
'''JTST''' Jet Stream<br>
<br>
'''JTSTR''' Jet Stream<br>
<br>
</div>
 
== K ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''K''' Cold (air mass)<br>
<br>
'''KC''' Kilocycles<br>
<br>
'''KEPOA''' Keep this Office Advised<br>
<br>
'''KFRST''' Killing Frost<br>
<br>
'''KG''' Kilogram<br>
<br>
'''KHZ''' Kilohertz<br>
<br>
'''KIAS''' Knots Indicated Airspeed<br>
<br>
'''KM''' Kilometers<br>
<br>
'''KMH''' Kilometers Per Hour<br>
<br>
'''KPA''' Kilopascal<br>
<br>
'''KT''' Knots<br>
<br>
'''KW''' Kilowatt<br>
<br>
</div>
 
== L ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''L''' Left<br>
<br>
'''L''' Locator<br>
<br>
'''L''' Logistics<br>
<br>
'''L/MF''' Low/Medium Frequency<br>
<br>
'''LA''' Low Approach<br>
<br>
'''LAA''' Local Airport Advisory<br>
<br>
'''LAADR''' Low Altitude Arrival/Departure Routing<br>
<br>
'''LAAS''' Local Area Augmentation System<br>
<br>
'''LAB''' Laboratory<br>
<br>
'''LABRDR''' Labrador<br>
<br>
'''LABS''' Leased Service A/B System<br>
<br>
'''LABS''' Low Altitude Bombing System<br>
<br>
'''LADP''' Local Airport Deicing Plan<br>
<br>
'''LAM''' Logical Acknowledgment<br>
<br>
'''LAN''' Inland<br>
<br>
'''LARCT''' Last Radio Contact<br>
<br>
'''LAT''' Latitude<br>
<br>
'''LAWRS''' Limited Aviation Weather Reporting Station<br>
<br>
'''LB''' Left Base<br>
<br>
'''LB''' Pounds<br>
<br>
'''LC''' Local Control<br>
<br>
'''LCA''' Locally<br>
<br>
'''LCL''' Local or locally<br>
<br>
'''LCT''' Locate<br>
<br>
'''LCTMP''' Little Change in Temperature<br>
<br>
'''LD''' Long Distance<br>
<br>
'''LDA''' Landing Distance Available<br>
<br>
'''LDA''' Localizer Type Directional Aid<br>
<br>
'''LDG''' Landing<br>
<br>
'''LDI''' Landing Direction Indicator<br>
<br>
'''LDIN''' Lead in Lighting System<br>
<br>
'''LEN''' Length<br>
<br>
'''LETFO''' Letter Follows<br>
<br>
'''LF''' Low Frequency<br>
<br>
'''LFC''' Laminar Flow Control<br>
<br>
'''LFNT''' Low Frequency Intersection<br>
<br>
'''LFR''' Low Frequency Radio Range<br>
<br>
'''LFT''' Lift<br>
<br>
'''LGRNG''' Long Range<br>
<br>
'''LGT''' Light<br>
<br>
'''LGTD''' Lighted<br>
<br>
'''LGWV''' Long Wave<br>
<br>
'''LICOF''' Land Lines Communications Facilities<br>
<br>
'''LIFR''' Low IFR<br>
<br>
'''LIH''' Light Intensity High<br>
<br>
'''LIL''' Light Intensity Low<br>
<br>
'''LIM''' Light Intensity Medium<br>
<br>
'''LIN''' Linearity<br>
<br>
'''LIRL''' Low Intensity Runway Edge Lights<br>
<br>
'''LK''' Lake<br>
<br>
'''LKLY''' Likely<br>
<br>
'''LKTYP''' Like Type<br>
<br>
'''LL''' Landline<br>
<br>
'''LLWAS''' Low Level Wind Shear Alert System<br>
<br>
'''LLWS''' Low Level Wind Shear<br>
<br>
'''LLZ''' Localizer<br>
<br>
'''LM''' Locator Middle<br>
<br>
'''LMM''' Compass locator at ILS middle marker<br>
<br>
'''LMT''' Limit<br>
<br>
'''LMT''' Local Mean Time<br>
<br>
'''LN''' Line<br>
<br>
'''LNAV''' Lateral Navigation<br>
<br>
'''LND''' Land<br>
<br>
'''LNDG''' Landing<br>
<br>
'''LO''' Liaison Officer<br>
<br>
'''LO''' Outer Locator<br>
<br>
'''LOA''' Letter of Agreement<br>
<br>
'''LOC''' Localizer<br>
<br>
'''LOCOR''' Local Coordinator<br>
<br>
'''LODISNAV''' Long Distance Navigation<br>
<br>
'''LOEAT''' Lowest Temperature Equaled for all Time<br>
<br>
'''LOEFM''' Lowest Temperature Equaled for the Month<br>
<br>
'''LOESE''' Lowest Temperature Equaled so Early<br>
<br>
'''LOESL''' Lowest Temperature Equaled so Late<br>
<br>
'''LOM''' Compass locator at ILS outer marker<br>
<br>
'''LONG''' Longitude<br>
<br>
'''LONGL''' Longitudinal<br>
<br>
'''LOP''' Line of Position<br>
<br>
'''LORAC''' Long Range Accuracy<br>
<br>
'''LORAN''' Long Range Air Navigation System<br>
<br>
'''LOTMP''' Lowest Temperature<br>
<br>
'''LOXAT''' Lowest Temperature Exceeded for all Time<br>
<br>
'''LOXFM''' Lowest Temperature Exceeded for the Month<br>
<br>
'''LOXSE''' Lowest Temperature Exceeded so Early<br>
<br>
'''LOXSL''' Lowest Temperature Exceeded so Late<br>
<br>
'''LP''' Left Traffic Pattern<br>
<br>
'''LP''' Linear Polarization<br>
<br>
'''LP''' Liquid Propane<br>
<br>
'''LP''' Localizer Performance Without Vertical Guidance<br>
<br>
'''LPV''' Localizer Performance With Vertical Guidance<br>
<br>
'''LR''' The last message received by me was<br>
<br>
'''LRA''' Landing Rights Airport<br>
<br>
'''LRCOM''' Long Range VHF/UHF Communications<br>
<br>
'''LRG''' Large<br>
<br>
'''LRG''' Long Range<br>
<br>
'''LRS''' Lake Reporting Service<br>
<br>
'''LS''' Left Side<br>
<br>
'''LS''' Last message sent by me was or last message was<br>
<br>
'''LSQ''' Line Squall<br>
<br>
'''LSR''' Loose Snow on Runway<br>
<br>
'''LST''' Local Standard Time<br>
<br>
'''LT''' Turn left after takeoff<br>
<br>
'''LTAV''' Light and Variable<br>
<br>
'''LTD''' Limited<br>
<br>
'''LTF''' Local Training Flight<br>
<br>
'''LTFC''' Landing Traffic<br>
<br>
'''LTGCA''' Lightning Cloud to Air<br>
<br>
'''LTGCC''' Lightning Cloud to Cloud<br>
<br>
'''LTGCCCG''' Lightning Cloud to Cloud Cloud to Ground<br>
<br>
'''LTGCG''' Lightning Cloud to Ground<br>
<br>
'''LTGCW''' Lightning Cloud to Water<br>
<br>
'''LTGIC''' Lightning in Clouds<br>
<br>
'''LTL''' Little<br>
<br>
'''LTLCG''' Little Change<br>
<br>
'''LTNG''' Lightning<br>
<br>
'''LTR''' Later<br>
<br>
'''LTR''' Letter<br>
<br>
'''LTT''' Landline Teletypewriter<br>
<br>
'''LTTR''' Latter<br>
<br>
'''LV''' Leaving<br>
<br>
'''LV''' Light and Variable<br>
<br>
'''LVE''' Leave or leaving<br>
<br>
'''LVG''' Leaving<br>
<br>
'''LVL''' Level<br>
<br>
'''LVLOF''' Level Off<br>
<br>
'''LWR''' Lower<br>
<br>
'''LX''' Low Index<br>
<br>
'''LYR''' Layer or layered or layers<br>
<br>
</div>
 
== M ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''M''' In RVR indicates visibility less than lowest reportable sensor value (e.g. M600)<br>
<br>
'''M''' In temperature field means “minus” or below zero<br>
<br>
'''M''' Mach number<br>
<br>
'''M''' Maritime (air mass)<br>
<br>
'''M''' Metres (preceded by figures)<br>
<br>
'''M''' Missing (weather reports only)<br>
<br>
'''M''' Mountain Standard Time (time groups only)<br>
<br>
'''MA''' Map Analysis<br>
<br>
'''MAA''' Maximum Authorized (IFR) Altitude<br>
<br>
'''MAC''' Military Airlift Command<br>
<br>
'''MACH''' MACH Number (speed ratio to speed of sound)<br>
<br>
'''MACKAY''' Mackay Radio and Telegraph Company<br>
<br>
'''MACVFR''' Make Altitude Changes VFR<br>
<br>
'''MAFAP''' Minimum Altitude over Facility on Final Approach Course<br>
<br>
'''MAG''' Magnetic<br>
<br>
'''MAGSI''' Minimum Altitude at Glide Slope Intersection Inbound<br>
<br>
'''MAINT''' Maintenance<br>
<br>
'''MAL''' Maintain at Least (altitude)<br>
<br>
'''MALS''' Medium-Intensity Approach Lighting System<br>
<br>
'''MALSF''' Medium-Intensity Approach Light System with Sequenced Flashers<br>
<br>
'''MALSR''' Medium-Intensity Approach Lighting System With Runway Alignment Indicator<br>
<br>
'''MAM''' Maintenance Assumes Monitor<br>
<br>
'''MAN''' Manitoba<br>
<br>
'''MAN''' Manual<br>
<br>
'''MANAM''' Manual Amendment<br>
<br>
'''MANOP''' Manual of Operations<br>
<br>
'''MAP''' Aeronautical Maps and Charts<br>
<br>
'''MAP''' Missed Approach Point<br>
<br>
'''MAPS''' Meteorological Aeronautical Presentation System<br>
<br>
'''MAPT''' Missed Approach Point<br>
<br>
'''MAR''' At sea<br>
<br>
'''MARPT''' Municipal Airport<br>
<br>
'''MARSA''' Military Assumes Responsibility for Separation of Aircraft<br>
<br>
'''MAS''' Manual A1 Simplex<br>
<br>
'''MAS''' Military Alert System<br>
<br>
'''MAX''' Maximum<br>
<br>
'''MB''' Marker Beacon<br>
<br>
'''MB''' Millibars<br>
<br>
'''MCA''' Minimum Crossing Altitude<br>
<br>
'''MCAS''' Marine Corps Air Station<br>
<br>
'''MCAS(H)''' Marine Corps Air Station (Helicopter)<br>
<br>
'''MCK''' Maintenance Check<br>
<br>
'''MCS''' Master Control Station<br>
<br>
'''MCW''' Modulated Continuous Wave<br>
<br>
'''MCZNE''' Minimum When Control Zone Effective<br>
<br>
'''MDA''' Minimum Descent Altitude<br>
<br>
'''MDF''' Medium Frequency Direction Finding Station<br>
<br>
'''MDFR''' Make Descent From<br>
<br>
'''MDFY''' Modify<br>
<br>
'''MDH''' Minimum Descent Height<br>
<br>
'''MDT''' Moderate<br>
<br>
'''MDZ''' Modernize<br>
<br>
'''MDZN''' Modernization<br>
<br>
'''MEA''' Minimum En Route Altitude<br>
<br>
'''MECH''' Mechanic<br>
<br>
'''MED''' Medical<br>
<br>
'''MED''' Medium<br>
<br>
'''MEDEVAC''' Medical Emergency Evacuation<br>
<br>
'''MEGG''' Merging<br>
<br>
'''MEHT''' Minimum Eye Height Over Threshold<br>
<br>
'''MEML''' Memorial<br>
<br>
'''MET''' Meteorological aviation routine weather report<br>
<br>
'''METOF''' Meteorological Officer<br>
<br>
'''METRO''' Metropolitan<br>
<br>
'''MEX''' Mexico<br>
<br>
'''MF''' Medium Frequency<br>
<br>
'''MFL''' Maintain Flight Level<br>
<br>
'''MFOB''' Minimum Fuel on Board<br>
<br>
'''MFPOF''' Master Flight Plan on File<br>
<br>
'''MFS''' Military Flight Service<br>
<br>
'''MFV''' Forward visibility more than (miles)<br>
<br>
'''MFXT''' Meter Fix Time<br>
<br>
'''MGAT''' Make Good a Track of (degrees)<br>
<br>
'''MGMT''' Make Good a Magnetic Track of (degrees)<br>
<br>
'''MGMT''' Management<br>
<br>
'''MGR''' Manager<br>
<br>
'''MHA''' Minimum Holding Altitude<br>
<br>
'''MHDF''' Medium and High Frequency Direction Finding Station<br>
<br>
'''MHDG''' Magnetic Heading<br>
<br>
'''MHFR''' Military Height Finder Radar<br>
<br>
'''MHKVLY''' Mohawk Valley<br>
<br>
'''MHVDF''' Medium High and Very High Frequency Direction Finding Station<br>
<br>
'''MHz''' Megahertz<br>
<br>
'''MI''' Manufacturing Inspector<br>
<br>
'''MI''' Mile<br>
<br>
'''MI''' Shallow<br>
<br>
'''MID''' Middle<br>
<br>
'''MID''' Midpoint (related to RVR)<br>
<br>
'''MID/ASIA'''  Middle East/Asia Region<br>
<br>
'''MIDIZ''' MidCanada Identification Zone<br>
<br>
'''MIDN''' Midnight<br>
<br>
'''MIDPT''' Midpoint<br>
<br>
'''MIFG''' Patches of shallow fog not deeper than two meters<br>
<br>
'''MIJI''' Meaconing Intrusion Jamming Interference<br>
<br>
'''MIL''' Military<br>
<br>
'''MIMNO''' Mimeographic Notice<br>
<br>
'''MIN''' Minute<br>
<br>
'''MINIT''' Minutes in Trail<br>
<br>
'''MIREQ''' Minimum Requirements Specified<br>
<br>
'''MIRL''' Medium Intensity Runway Edge Lights<br>
<br>
'''MIS''' Missing<br>
<br>
'''MISC''' Miscellaneous<br>
<br>
'''MISG''' Missing<br>
<br>
'''MISL''' Missile<br>
<br>
'''MIT''' Miles in Trail<br>
<br>
'''MITO''' Minimum Interval Takeoff<br>
<br>
'''MKCT''' Make Check Turn<br>
<br>
'''MKD''' Marked<br>
<br>
'''MKR''' Marker<br>
<br>
'''MKR''' Marker Radio Beacon<br>
<br>
'''MLS''' Microwave Landing System<br>
<br>
'''MLTLVL''' Melting Level<br>
<br>
'''MM''' Middle Marker<br>
<br>
'''MM''' Millimeter<br>
<br>
'''MMACH''' Maintain Mach<br>
<br>
'''MMO''' Main Meteorological Office<br>
<br>
'''MNLD''' Mainland<br>
<br>
'''MNLY''' Mainly<br>
<br>
'''MNM''' Minimum<br>
<br>
'''MNPS''' Minimum Navigation Performance Specification<br>
<br>
'''MNPSA''' Minimum Navigation Performance Specification Airspace<br>
<br>
'''MNT''' Monitor<br>
<br>
'''MNTN''' Maintain<br>
<br>
'''MNVR''' Maneuver<br>
<br>
'''MOA''' Memorandum of Agreement<br>
<br>
'''MOA''' Military Operations Area<br>
<br>
'''MOC''' Minimum Obstacle Clearance<br>
<br>
'''MOCA''' Minimum Obstruction Clearance Altitude<br>
<br>
'''MOD''' Moderate<br>
<br>
'''MOD''' Modulate or modulation or modulator<br>
<br>
'''MOGR''' Moderate or Greater<br>
<br>
'''MON''' Above mountains<br>
<br>
'''MONOK''' Monitor resumed normal operation<br>
<br>
'''MONOS''' Monitor out of service<br>
<br>
'''MONTR''' Monitor<br>
<br>
'''MOPS''' Minimum Operational Performance Standards<br>
<br>
'''MOPTAR''' Multiobject Phase Tracking and Ranging<br>
<br>
'''MOREPS''' Monitor Station Reports<br>
<br>
'''MOT''' Ministry of Transport (Canada)<br>
<br>
'''MOTNE''' Meteorological Operational Telecommunications Network Europe<br>
<br>
'''MOV''' Move<br>
<br>
'''MPH''' Miles Per Hour<br>
<br>
'''MPP''' Merit Promotion Program<br>
<br>
'''MPS''' Meters Per Second<br>
<br>
'''MPVA''' Maintain a Position VFR and Advise<br>
<br>
'''MRA''' Minimum Reception Altitude<br>
<br>
'''MRG''' Medium Range<br>
<br>
'''MRGL''' Marginal<br>
<br>
'''MRM''' Maintenance Returns Monitor<br>
<br>
'''MRNG''' Morning<br>
<br>
'''MRP''' ATS/MET Reporting Point<br>
<br>
'''MRR''' Mechanical Reliability Report<br>
<br>
'''MRTM''' Maritime<br>
<br>
'''MRU''' Military Radar Unit<br>
<br>
'''MS''' Minus<br>
<br>
'''MSA''' Minimum Safe/sector Altitude<br>
<br>
'''MSAW''' Minimum Safe Altitude Warning<br>
<br>
'''MSG''' Message<br>
<br>
'''MSGCTR''' Message Center<br>
<br>
'''MSL''' Mean Sea Level<br>
<br>
'''MSR''' Message (transmission identification) has been misrouted<br>
<br>
'''MSSR''' Monopulse Secondary Surveillance Radar<br>
<br>
'''MSTLY''' Mostly<br>
<br>
'''MSTR''' Moisture<br>
<br>
'''MT''' Mountain<br>
<br>
'''MTCA''' Minimum Terrain Clearance Altitude<br>
<br>
'''MTI''' Moving Target Indicator<br>
<br>
'''MTN''' Mountain<br>
<br>
'''MTR''' Military Training Route<br>
<br>
'''MTRL''' Material<br>
<br>
'''MTRY''' Momentary<br>
<br>
'''MTU''' Metric Units<br>
<br>
'''MTW''' Mountain Wave<br>
<br>
'''MU''' Friction value representing runway surface conditions<br>
<br>
'''MUA''' Maximum Usable Altitude<br>
<br>
'''MUF''' Maximum Usable Frequency<br>
<br>
'''MULT''' Multiple<br>
<br>
'''MUNI''' Municipal<br>
<br>
'''MV''' Millivolt<br>
<br>
'''MVA''' Minimum Vector Altitude<br>
<br>
'''MVDF''' Medium and very high frequency direction finding station<br>
<br>
'''MVFR''' Maintain VFR<br>
<br>
'''MVFR''' Marginal VFR<br>
<br>
'''MVSP''' Maintain Visual Separation<br>
<br>
'''MWO''' Meteorological Watch Office<br>
<br>
'''MWRC''' Maintain Well to Right of Course<br>
<br>
'''MWTCS''' Modernized Weather Teletypewriter Communications System<br>
<br>
'''MXD''' Mixed<br>
<br>
</div>
 
== N ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''N''' North or northern latitude<br>
<br>
'''N/A''' Not Applicable<br>
<br>
'''NA''' National Air Traffic Controllers Association<br>
<br>
'''NA''' Not Authorized<br>
<br>
'''NAAS''' Naval Auxiliary Air Station<br>
<br>
'''NAATS''' National Association of Air Traffic Control Specialists<br>
<br>
'''NAB''' Not Above<br>
<br>
'''NACOS''' National Communications Schedule<br>
<br>
'''NADIN''' National Airspace Data Interchange Network<br>
<br>
'''NAF''' Naval Air Facility<br>
<br>
'''NAFEC''' National Aviation Facilities Experimental Center<br>
<br>
'''NANAC''' National Aircraft Noise Abatement Council<br>
<br>
'''NAP''' Not at Present<br>
<br>
'''NAPRS''' National Airspace Performance Reporting System<br>
<br>
'''NAR''' North American Route<br>
<br>
'''NAR''' Not According to Routine<br>
<br>
'''NAS''' National Airspace System<br>
<br>
'''NAS''' Naval Air Station<br>
<br>
'''NAS''' Navigation and Collision Avoidance System<br>
<br>
'''NASA''' National Aeronautics and Space Administration<br>
<br>
'''NASC''' National AIS System Centre<br>
<br>
'''NASEO''' National Airways System Engineering Office<br>
<br>
'''NASP''' National Airport System Plan<br>
<br>
'''NAT''' North Atlantic<br>
<br>
'''NAT''' Not ARTS tracked<br>
<br>
'''NATL''' National<br>
<br>
'''NATR''' No Additional Traffic Reported<br>
<br>
'''NATS''' Noise Abatement Test System<br>
<br>
'''NAV''' Navigation<br>
<br>
'''NAVAID''' Navigational Aid<br>
<br>
'''NAVLO''' Navy Liaison Officer<br>
<br>
'''NAVREP''' Navy Representative<br>
<br>
'''NB''' New Brunswick<br>
<br>
'''NB''' Northbound<br>
<br>
'''NBCAP''' National Beacon Code Allocation Plan<br>
<br>
'''NBFR''' Not Before<br>
<br>
'''NBND''' Northbound<br>
<br>
'''NBRHD''' Neighborhood<br>
<br>
'''NC''' National Air Transport Coordinating Committee<br>
<br>
'''NC''' No Change<br>
<br>
'''NCDC''' National Climatic Data Center<br>
<br>
'''NCE''' No Change in Estimates<br>
<br>
'''NCS''' National Communications System<br>
<br>
'''NCWX''' No Change in Weather<br>
<br>
'''NDB''' Nondirectional Radio Beacon<br>
<br>
'''NDB/DME''' NDB and DME (collocated)<br>
<br>
'''NDBLO''' Not to Descend Below<br>
<br>
'''NE''' Northeast<br>
<br>
'''NEB''' Northeastbound<br>
<br>
'''NEC''' Necessary<br>
<br>
'''NEF''' No Further Clearance Required<br>
<br>
'''NEG''' Negative<br>
<br>
'''NELY''' Northeasterly<br>
<br>
'''NERN''' Northeastern<br>
<br>
'''NESS''' National Environmental Satellite Service<br>
<br>
'''NETR''' No Essential Traffic Reported<br>
<br>
'''NEW''' ENG New England<br>
<br>
'''NFDC''' National Flight Data Center<br>
<br>
'''NFDD''' National Flight Data Digest<br>
<br>
'''NFLD''' Newfoundland<br>
<br>
'''NFQ''' Night Frequency<br>
<br>
'''NFT''' No Filing Time<br>
<br>
'''NFU''' Not For Us<br>
<br>
'''NG''' National Guard<br>
<br>
'''NGT''' Night<br>
<br>
'''NHD''' Not Heard<br>
<br>
'''NICS''' National Airspace System Interfacility Communications System<br>
<br>
'''NIL''' None<br>
<br>
'''NIL''' Unable to transmit<br>
<br>
'''NIS''' Not in System<br>
<br>
'''NL''' No Layers<br>
<br>
'''NLT''' Not Later Than<br>
<br>
'''NM''' Nautical Mile<br>
<br>
'''NMBR''' Number<br>
<br>
'''NMC''' National Meteorological Center<br>
<br>
'''NML''' Normal<br>
<br>
'''NMN''' No Middle Name<br>
<br>
'''NMR''' Nautical Mile Radius<br>
<br>
'''NMRS''' Numerous<br>
<br>
'''NNE''' North North East<br>
<br>
'''NNERN''' North North Eastern<br>
<br>
'''NNEWD''' North North Eastward<br>
<br>
'''NNW''' North North west<br>
<br>
'''NNWRN''' North North Western<br>
<br>
'''NNWWD''' North Westward<br>
<br>
'''NO''' Not available<br>
<br>
'''NOAA''' National Oceanic and Atmospheric Administration<br>
<br>
'''NOAC''' No Action Necessary<br>
<br>
'''NOF''' NOTAM Office<br>
<br>
'''NOFIN''' No Further Information<br>
<br>
'''NOHOL''' Not Holding<br>
<br>
'''NOIFN''' No Information<br>
<br>
'''NOM''' National Communications Center<br>
<br>
'''NOMAD''' Naval Oceanographic Meteorological Automatic Device<br>
<br>
'''NONEG''' Negative replies not required<br>
<br>
'''NONRVSM''' Non-RVSM Capable Flight<br>
<br>
'''NOPAC''' North Pacific<br>
<br>
'''NOPAR''' Do not pass to Air Defense radar<br>
<br>
'''NOPT''' No Procedure Turn Required<br>
<br>
'''NORAC''' No Radio Contact<br>
<br>
'''NORAD''' North American Aerospace Defense Command<br>
<br>
'''NORDO''' No Radio<br>
<br>
'''NOREC''' No Record<br>
<br>
'''NOREP''' No Report<br>
<br>
'''NORIV''' No Arrival Report<br>
<br>
'''NORPI''' No pilot balloon observation will be filed next collection unless weather changes significantly<br>
<br>
'''NORR''' No Reply Received<br>
<br>
'''NORST''' No Restrictions<br>
<br>
'''NOS''' National Ocean Service<br>
<br>
'''NOSI''' now Simultaneous<br>
<br>
'''NOSIG''' No Significant Change<br>
<br>
'''NOSPL''' No Special Observations Taken (weather reports only)<br>
<br>
'''NOSUM''' NOTAM Summary<br>
<br>
'''NOTAM''' Notice to Air Missions<br>
<br>
'''NOTAM''' Notice to Airmen (No longer used)<br>
<br>
'''NOZ''' Normal operating zone<br>
<br>
'''NPI''' Nonprecision Instrument<br>
<br>
'''NPRL''' No Parallel Traffic<br>
<br>
'''NPRM''' Notice of Proposed Rulemaking<br>
<br>
'''NPRS''' Nonpersistent<br>
<br>
'''NR''' Near<br>
<br>
'''NR''' Number<br>
<br>
'''NRAB''' Naval Reserve Air Base<br>
<br>
'''NRD''' No Record of Destination<br>
<br>
'''NRH''' No Reply Heard<br>
<br>
'''NRP''' North American Route Program<br>
<br>
'''NRV''' Nonrevenue<br>
<br>
'''NRW''' Narrow<br>
<br>
'''NS''' Nimbostratus<br>
<br>
'''NS''' Nova Scotia<br>
<br>
'''NSC''' No Significant Clouds<br>
<br>
'''NSC''' Nonstandard C/A Code<br>
<br>
'''NSCSWD''' No Small Craft or Storm Warning are Being Displayed<br>
<br>
'''NSP''' Nonstandard Holding Pattern<br>
<br>
'''NSSFC''' National Severe Storm Forecast Center<br>
<br>
'''NSTP''' Nonstop<br>
<br>
'''NSW''' No Significant Weather<br>
<br>
'''NTAP''' National Track Analysis Program<br>
<br>
'''NTAP''' Notices To Airmen Publication<br>
<br>
'''NTE''' Not to Exceed<br>
<br>
'''NTFND''' No Trouble Found<br>
<br>
'''NTFY''' Notify<br>
<br>
'''NTL''' National<br>
<br>
'''NTO''' Name to<br>
<br>
'''NTRP''' No Traffic Reported<br>
<br>
'''NTSB''' National Transportation Safety Board<br>
<br>
'''NTZ''' No Transgression Zone<br>
<br>
'''NUDET''' Nuclear Detonation<br>
<br>
'''NVA''' Negative Vorticity Advection<br>
<br>
'''NW''' Northwest<br>
<br>
'''NWB''' Northwestbound<br>
<br>
'''NWLY''' Northwesterly<br>
<br>
'''NWRN''' Northwestern<br>
<br>
'''NWS''' National Weather Service<br>
<br>
'''NWSO''' Naval Weather Service Office<br>
<br>
'''NXT''' Next<br>
<br>
</div>
 
== O ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''O/F''' On File<br>
<br>
'''O/R''' On Request<br>
<br>
'''O/T''' Overtime<br>
<br>
'''OA''' Overhead Approach<br>
<br>
'''OAC''' Oceanic Area Control<br>
<br>
'''OAG''' Official Airline Guide<br>
<br>
'''OANDR''' Operation and Regulation<br>
<br>
'''OAOI''' On and Off Instruments<br>
<br>
'''OARTS''' Oceanic Air Route Tracking System<br>
<br>
'''OAS''' Obstacle Assessment Surface<br>
<br>
'''OAT''' Outside Air Temperature<br>
<br>
'''OB''' On Board<br>
<br>
'''OBL''' Obliterate<br>
<br>
'''OBND''' Outbound<br>
<br>
'''OBS''' Observation<br>
<br>
'''OBSC''' Obscure obscured or obscuring<br>
<br>
'''OBST''' Obstacle<br>
<br>
'''OBST''' Obstruct<br>
<br>
'''OBSTN''' Obstruction<br>
<br>
'''OC''' Obstruction Chart<br>
<br>
'''OC''' On Course<br>
<br>
'''OCA''' Obstacle Clearance Altitude<br>
<br>
'''OCA''' Oceanic Control Area<br>
<br>
'''OCAC''' Oceanic<br>
<br>
'''OCAS''' Out of Controlled Airspace<br>
<br>
'''OCFNT''' Occluded Front<br>
<br>
'''OCH''' Obstacle Clearance Height<br>
<br>
'''OCL''' Obstacle Clearance Limit<br>
<br>
'''OCLD''' Occlude<br>
<br>
'''OCLN''' Occlusion<br>
<br>
'''OCNL''' Occasional<br>
<br>
'''OCR''' Occur<br>
<br>
'''OCS''' Obstacle clearance surface<br>
<br>
'''OCTLA''' Out of Control Area<br>
<br>
'''ODALS''' Omnidirectional Approach Lighting System<br>
<br>
'''ODAPS''' Oceanic Display and Planning System<br>
<br>
'''OFAS''' Overseas Flight Assistance Service<br>
<br>
'''OFC''' Office<br>
<br>
'''OFFL''' Official<br>
<br>
'''OFM''' Out For Maintenance<br>
<br>
'''OFP''' Occluded Frontal Passage<br>
<br>
'''OFP''' Original Flight Plan<br>
<br>
'''OFSHR''' Offshore<br>
<br>
'''OFW''' Off Watch<br>
<br>
'''OFXT''' Outer Fix Time<br>
<br>
'''OFZ''' Obstacle free zone<br>
<br>
'''OG''' On Ground<br>
<br>
'''OGN''' Originate<br>
<br>
'''OHD''' Overhead<br>
<br>
'''OI''' On Instruments<br>
<br>
'''OINT''' Omni Intersection<br>
<br>
'''OIS''' Operational Information System<br>
<br>
'''OJT''' On The Job Training<br>
<br>
'''OK''' Operating Normally<br>
<br>
'''OK''' We agree or it is correct<br>
<br>
'''OLDI''' On Line Data Interchange<br>
<br>
'''OLS''' Optical Landing System<br>
<br>
'''OM''' Outer Marker<br>
<br>
'''OMSG''' Our Message<br>
<br>
'''OMTNS''' Over Mountains<br>
<br>
'''ONER''' Oceanic Navigational Error Report<br>
<br>
'''ONSHR''' On Shore<br>
<br>
'''ONT''' Ontario<br>
<br>
'''ONW''' On Watch<br>
<br>
'''OOT''' Out of Tolerance<br>
<br>
'''OPA''' Opaque white type of ice formation<br>
<br>
'''OPC''' Operational Control<br>
<br>
'''OPDT''' Opposite Direction Traffic<br>
<br>
'''OPER''' Operate<br>
<br>
'''OPMET''' Operational Meteorological (information)<br>
<br>
'''OPN''' Open<br>
<br>
'''OPN''' Operation<br>
<br>
'''OPNML''' Operations Normal<br>
<br>
'''OPR''' Operate Operator Operational<br>
<br>
'''OPS''' Operations<br>
<br>
'''OPSNET''' Operations Network<br>
<br>
'''ORD''' Order<br>
<br>
'''ORGPHC''' Orographic<br>
<br>
'''ORIG''' Original<br>
<br>
'''ORL''' Overrun Lights<br>
<br>
'''ORS''' Over Range Station<br>
<br>
'''OSV''' Ocean Station Vessel<br>
<br>
'''OT''' Oral Notice<br>
<br>
'''OT''' On Time<br>
<br>
'''OTAS''' On Top and Smooth<br>
<br>
'''OTFC''' Overflight Traffic<br>
<br>
'''OTLK''' Outlook<br>
<br>
'''OTP''' On Top<br>
<br>
'''OTR''' Other<br>
<br>
'''OTRW''' Otherwise<br>
<br>
'''OTS''' Organized Track System<br>
<br>
'''OTS''' Out of Service<br>
<br>
'''OUBD''' Outbound<br>
<br>
'''OV''' Location (PIREP only)<br>
<br>
'''OVC''' Overcast<br>
<br>
'''OVD''' Overdue<br>
<br>
'''OVHD''' Overhead<br>
<br>
'''OVLA''' Overlay<br>
<br>
'''OVNGT''' Overnight<br>
<br>
'''OVR''' Over<br>
<br>
'''OVRN''' Overrun<br>
<br>
'''OVSEA''' Overseas<br>
<br>
'''OVTK''' Overtake<br>
<br>
'''OW''' One Way<br>
<br>
'''OWF''' Optimum Working Frequency<br>
<br>
'''OXY''' Oxygen<br>
<br>
</div>
 
== P ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''P''' In RVR indicates visibility greater than highest reportable sensor value<br>
<br>
'''P''' Pacific Standard Time<br>
<br>
'''P''' Polar (air mass)<br>
<br>
'''P''' Precision approach terrain chart<br>
<br>
'''P''' Prohibited Area<br>
<br>
'''P/CG''' Pilot Controller Glossary<br>
<br>
'''P6SM''' Visibility greater than 6 SM (TAF only)<br>
<br>
'''PA''' Precision Approach<br>
<br>
'''PA''' Pressure Altitude<br>
<br>
'''PAC''' Pacific<br>
<br>
'''PACF''' Parent FSS assumes control of part time FSS<br>
<br>
'''PADRA''' Pass to Air Defense Radar<br>
<br>
'''PAEW''' Personnel and Equipment Working<br>
<br>
'''PAJA''' Parachute Jumping Activities<br>
<br>
'''PALS''' Precision Approach Lighting System<br>
<br>
'''PALT''' Present Altitude<br>
<br>
'''PANS''' Procedures for Air Navigation Services<br>
<br>
'''PAP''' ProAirPilot<br>
<br>
'''PAPI''' Precision Approach Path Indicator<br>
<br>
'''PAR''' Precision Approach Radar<br>
<br>
'''PARA''' Paragraph<br>
<br>
'''PAREN''' Parenthesis<br>
<br>
'''PARL''' Parallel<br>
<br>
'''PARROT''' Position Adjustable Range Reference Orientation Transponder<br>
<br>
'''PAT''' Pattern<br>
<br>
'''PATWAS''' Pilots Automatic Telephone Weather Answering Service<br>
<br>
'''PAU''' Present Address Unknown<br>
<br>
'''PAX''' Passenger<br>
<br>
'''PBCT''' Proposed Boundary Crossing Time<br>
<br>
'''PBL''' Probable<br>
<br>
'''PBS''' Public Buildings Service<br>
<br>
'''PCA''' Positive Control Area<br>
<br>
'''PCD''' Proceed<br>
<br>
'''PCK''' Pilot Check<br>
<br>
'''PCL''' Pilot Controlled Lighting<br>
<br>
'''PCN''' Pavement Classification Number<br>
<br>
'''PCPN''' Precipitation<br>
<br>
'''PCS''' Permanent Change of Station<br>
<br>
'''PD''' Period<br>
<br>
'''PDAR''' Preferential Arrival/Departure Route<br>
<br>
'''PDC''' Predeparture Clearance<br>
<br>
'''PDDC''' Proceed Directly on Course<br>
<br>
'''PDMT''' Predominant<br>
<br>
'''PDMT''' Predominate<br>
<br>
'''PDOP''' Position Dilution of Precision<br>
<br>
'''PDR''' Preferential Departure Route (Stage A)<br>
<br>
'''PDW''' Priority Delayed Weather<br>
<br>
'''PEN''' Peninsula<br>
<br>
'''PENT''' Penetrate or penetration<br>
<br>
'''PER''' Performance<br>
<br>
'''PERCOM''' Peripheral Communications<br>
<br>
'''PERF''' Perforator<br>
<br>
'''PERM''' Permanent<br>
<br>
'''PFSV''' Pilot to Forecaster Service<br>
<br>
'''PGTSND''' Puget Sound<br>
<br>
'''PHYS''' Physical<br>
<br>
'''PIB''' Preflight Information Bulletin<br>
<br>
'''PIBAL''' Pilot Balloon Observation<br>
<br>
'''PIC''' Pilot in Command<br>
<br>
'''PIR''' Precision Instrument Runway<br>
<br>
'''PIREP''' Pilot Weather Report<br>
<br>
'''PIRFC''' Pilot Requests Forecast<br>
<br>
'''PISE''' No pilot balloon observation due to unfavorable sea conditions<br>
<br>
'''PISO''' No pilot balloon observation due to snow<br>
<br>
'''PIT''' Pilot Instructor Training<br>
<br>
'''PIWI''' No pilot balloon observation due to high, or gusty, surface wind<br>
<br>
'''PJE''' Parachute Jumping Exercise<br>
<br>
'''PK''' WND Peak Wind<br>
<br>
'''PL''' Ice Pellets<br>
<br>
'''PLA''' Practice Low Approach<br>
<br>
'''PLASI''' Pulsating Visual Approach Slope Indicators<br>
<br>
'''PLAT''' Present Latitude<br>
<br>
'''PLF''' Private Line Telephone<br>
<br>
'''PLN''' Flight Plan<br>
<br>
'''PLOB''' Place of Birth<br>
<br>
'''PLONG''' Present Longitude<br>
<br>
'''PLS''' Please<br>
<br>
'''PLT''' Private Line Teletypewriter<br>
<br>
'''PLVL''' Present Level<br>
<br>
'''PLW''' Plow (snow)<br>
<br>
'''PM''' Post Meridiem<br>
<br>
'''PMSN''' Permission<br>
<br>
'''PMT''' Permit<br>
<br>
'''PN''' Prior Notice Required<br>
<br>
'''PNHDL''' Panhandle<br>
<br>
'''PNR''' Point of No Return<br>
<br>
'''PO''' Dust Devils<br>
<br>
'''PO''' Post Office<br>
<br>
'''PO''' Purchase Order<br>
<br>
'''POA''' Privately Owned Aircraft<br>
<br>
'''POB''' Persons On Board<br>
<br>
'''POC''' Proceed or Proceeding On Course<br>
<br>
'''POS''' Positive<br>
<br>
'''POSS''' Possible<br>
<br>
'''POV''' Privately Owned Vehicle<br>
<br>
'''PP''' Pay Period (number)<br>
<br>
'''PPI''' Plan Position Indicator<br>
<br>
'''PPINA''' Radar weather report not available (or omitted for a reason different than those otherwise stated)<br>
<br>
'''PPINE''' Radar weather report no echoes observed<br>
<br>
'''PPINO''' Radar weather report equipment inoperative due to breakdown<br>
<br>
'''PPIOK''' Radar weather report equipment operation resumed<br>
<br>
'''PPIOM''' Radar weather report equipment inoperative due to maintenance<br>
<br>
'''PPR''' Prior Permission Required<br>
<br>
'''PPS''' Propose<br>
<br>
'''PPSN''' Present Position<br>
<br>
'''PR''' Partial<br>
<br>
'''PR''' Photo Reconnaissance<br>
<br>
'''PRBL''' Probable<br>
<br>
'''PRBLTY''' Probability<br>
<br>
'''PRBO''' Position Relief Briefing Observed<br>
<br>
'''PRCF''' Parent FSS returns control of part time FSS<br>
<br>
'''PRCHT''' Parachute<br>
<br>
'''PRCTN''' Precaution<br>
<br>
'''PRECD''' Precede<br>
<br>
'''PREF''' Preferred<br>
<br>
'''PRES''' Pressure<br>
<br>
'''PRESFR''' Pressure Falling Rapidly<br>
<br>
'''PRESRR''' Pressure Rising Rapidly<br>
<br>
'''PREV''' Previous<br>
<br>
'''PRFG''' Fog Partial<br>
<br>
'''PRI''' Primary<br>
<br>
'''PRIM''' Primary<br>
<br>
'''PRIN''' Principal<br>
<br>
'''PRIND''' Present Indications Are<br>
<br>
'''PRIRA''' Primary Radar<br>
<br>
'''PRJMP''' Pressure Jump (weather reports only)<br>
<br>
'''PRKG''' Parking<br>
<br>
'''PRN''' Pseudo Random Noise<br>
<br>
'''PROB''' Probability<br>
<br>
'''PROB30''' Probability 30 Percent<br>
<br>
'''PROB40''' Probability 40 Percent<br>
<br>
'''PROC''' Procedure<br>
<br>
'''PROCD''' Proceed<br>
<br>
'''PROG''' Prognosis or prognostic<br>
<br>
'''PROG''' Progress<br>
<br>
'''PROP''' Propeller<br>
<br>
'''PROPA''' Propagation<br>
<br>
'''PROSIG''' Procedure Signal<br>
<br>
'''PROV''' Provisional<br>
<br>
'''PRP''' Prepare<br>
<br>
'''PRSNT''' Present<br>
<br>
'''PRST''' Persist<br>
<br>
'''PRVD''' Provide<br>
<br>
'''PS''' Passenger Service<br>
<br>
'''PS''' Plus<br>
<br>
'''PSBL''' Possible<br>
<br>
'''PSBT''' Pilot Self Briefing Terminal<br>
<br>
'''PSG''' Passage<br>
<br>
'''PSG''' Passing<br>
<br>
'''PSGR''' Passenger<br>
<br>
'''PSN''' Position<br>
<br>
'''PSNAL''' Personal<br>
<br>
'''PSNL''' Personnel<br>
<br>
'''PSNRP''' Position Report<br>
<br>
'''PSP''' Pierced Steel Planking<br>
<br>
'''PSR''' Packed Snow on Runway<br>
<br>
'''PSR''' Primary Surveillance radar<br>
<br>
'''PSRI''' Position Subject to Return of Incumbent<br>
<br>
'''PSRS''' Position Subject to Rotating Shifts<br>
<br>
'''PST''' Pacific Standard Time<br>
<br>
'''PT''' Procedure Turn<br>
<br>
'''PTC''' Plan to Clear<br>
<br>
'''PTC''' Positive Target Control<br>
<br>
'''PTCHY''' Pitchy<br>
<br>
'''PTCP''' Participate<br>
<br>
'''PTLY''' Partly<br>
<br>
'''PTN''' Portion<br>
<br>
'''PTN''' Procedure Turn<br>
<br>
'''PTP''' Point To Point<br>
<br>
'''PTR''' Printer<br>
<br>
'''PTS''' Polar Track Structure<br>
<br>
'''PUB''' Public<br>
<br>
'''PUBL''' Publish<br>
<br>
'''PUP''' Pickup<br>
<br>
'''PVA''' Positive Vorticity Advection<br>
<br>
'''PVASI''' Pulsating Visual Approach Slope Indicator<br>
<br>
'''PVL''' Prevail<br>
<br>
'''PVLT''' Prevalent<br>
<br>
'''PVT''' Private<br>
<br>
'''PWB''' Pilot Weather Briefing<br>
<br>
'''PWI''' Proximity Warning Indicator<br>
<br>
'''PWINO''' Precipitation identifier information not available (weather reports only)<br>
<br>
'''PWR''' Power<br>
<br>
'''PWRNO''' Power Failure<br>
<br>
'''PWROK''' Power Restored<br>
<br>
'''PY''' Spray<br>
<br>
</div>
 
== Q ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''QDL''' Question asking for a series of bearings typically used in ICAO<br>
<br>
'''QDM''' Magnetic Heading<br>
<br>
'''QDR''' Magnetic Bearing<br>
<br>
'''QFE''' Atmospheric pressure at airport elevation<br>
<br>
'''QFLOW''' Quota Flow Control Procedures<br>
<br>
'''QFU''' Magnetic orientation of runway<br>
<br>
'''QJH''' Shall I run my test tape/a test sentence<br>
<br>
'''QLFY''' Qualify<br>
<br>
'''QLTY''' Quality<br>
<br>
'''QN''' Question<br>
<br>
'''QNH''' Altimeter subscale setting to obtain elevation when on the ground<br>
<br>
'''QNTY''' Quantity<br>
<br>
'''QSP''' Question asking for free of charge relay in ICAO<br>
<br>
'''QSTNRY''' Quasi Stationary<br>
<br>
'''QTA''' Shall I cancel telegram number?<br>
<br>
'''QTE''' True bearing<br>
<br>
'''QTR''' Quarter<br>
<br>
'''QUAD''' Quadrant<br>
<br>
'''QUE''' Quebec<br>
<br>
'''QUJ''' Questions asking for TRUE track in degrees and time in ICAO<br>
<br>
</div>
 
== R ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''R''' Acknowledgment of receipt (message handling)<br>
<br>
'''R''' Received (acknowledgment of receipt)<br>
<br>
'''R''' Restricted area (followed by identification)<br>
<br>
'''R''' Right (runway identification)<br>
<br>
'''R''' Runway (used in RVR measurement)<br>
<br>
'''R/O''' Receive Only<br>
<br>
'''R/OC''' Receive Only Centers<br>
<br>
'''RA''' Rain<br>
<br>
'''RAA''' Remote Airport Advisory<br>
<br>
'''RAAF''' Royal Australian Air Force<br>
<br>
'''RABA''' No RAWIN observation no balloons available<br>
<br>
'''RABAL''' Radiosonde balloon wind data<br>
<br>
'''RABAR''' Radiosonde balloon release<br>
<br>
'''RAC''' Request Altitude Change<br>
<br>
'''RAC''' Rules of the Air and Air Traffic Services<br>
<br>
'''RACE''' Request Altitude Changes En Route<br>
<br>
'''RACFI''' Radio and Communication Facilities Inoperative<br>
<br>
'''RACO''' No RAWIN Observation Communications Out<br>
<br>
'''RACON''' Radar Responder Beacon<br>
<br>
'''RADAT''' Radiosonde Observation Data<br>
<br>
'''RADEP''' Radar Departure<br>
<br>
'''RADNO''' Report missing account radio failure<br>
<br>
'''RADON''' Radar Beacon<br>
<br>
'''RADU''' Weather Radar Analysis and Development Unit<br>
<br>
'''RAF''' Royal Air Force<br>
<br>
'''RAFC''' Regional Area Forecast Center<br>
<br>
'''RAFI''' Radiosonde Observation Not Filed<br>
<br>
'''RAFRZ''' Radiosonde Observation Freezing Levels<br>
<br>
'''RAG''' Ragged<br>
<br>
'''RAG''' Runway Arresting Gear<br>
<br>
'''RAGF''' Remote Air Ground Facility<br>
<br>
'''RAHE''' No RAWIN observation no gas available<br>
<br>
'''RAI''' Runway Alignment Indicator<br>
<br>
'''RAICG''' Radiosonde Observation Icing At<br>
<br>
'''RAIL''' Runway Alignment Indicator Lights<br>
<br>
'''RAIM''' Receiver Autonomous Integrity Monitoring<br>
<br>
'''RAJAM''' Radar Jamming<br>
<br>
'''RALT''' Regardless of Altitude<br>
<br>
'''RAM''' Returned Account Mechanical<br>
<br>
'''RAOB''' Radiosonde Observation<br>
<br>
'''RAPCON''' Radar Approach Control<br>
<br>
'''RAPI''' Radiosonde report already sent in<br>
<br>
'''RARAD''' Radar Advisory<br>
<br>
'''RAREP''' Radar Weather Report<br>
<br>
'''RASC''' Regional AIS System Centre<br>
<br>
'''RASH''' Rain Showers<br>
<br>
'''RASN''' Rain and snow or showers of rain and snow<br>
<br>
'''RAVU''' Radiosonde Analysis and Verification Unit<br>
<br>
'''RAWE''' No RAWIN observations unfavorable weather<br>
<br>
'''RAWI''' No RAWIN observations high and gusty winds<br>
<br>
'''RAWIN''' Upper winds observation (by radio methods)<br>
<br>
'''RAWX''' Returned Account Weather<br>
<br>
'''RB''' Rescue Boat<br>
<br>
'''RB''' Right Base<br>
<br>
'''RBDE''' Radar Bright Display Equipment<br>
<br>
'''RBN''' Radio Beacon<br>
<br>
'''RBOC''' Report Back on Course<br>
<br>
'''RBOF''' Report Back on Frequency<br>
<br>
'''RBS''' PP (RBS) Ration by schedule plus compression<br>
<br>
'''RBS''' Radar Bomb Scoring<br>
<br>
'''RC''' Reverse Course<br>
<br>
'''RC''' Road Reconnaissance<br>
<br>
'''RCA''' Reach Cruising Altitude<br>
<br>
'''RCADV''' Reverse Course and Advise<br>
<br>
'''RCAG''' Remote Communications Air Ground Facility<br>
<br>
'''RCALT''' Reach Cruising Altitude<br>
<br>
'''RCC''' Rescue Coordination Center<br>
<br>
'''RCD''' Radar Cloud Detection Report<br>
<br>
'''RCDNA''' Radar Cloud Detection Report Not Available<br>
<br>
'''RCDNE''' Radar Cloud Detection Report No Echoes Observed<br>
<br>
'''RCDNO''' Radar cloud detector inoperative due to breakdown until<br>
<br>
'''RCDOM''' Radar cloud detector inoperative due to maintenance until<br>
<br>
'''RCF''' Radio Communication Failure<br>
<br>
'''RCF''' Remain on Company Frequency<br>
<br>
'''RCH''' Reach<br>
<br>
'''RCK''' Radio Check<br>
<br>
'''RCKY''' Rockies (mountains)<br>
<br>
'''RCL''' Runway Center Line<br>
<br>
'''RCLL''' Runway Center Line Lights<br>
<br>
'''RCLM''' Runway Centerline Marking<br>
<br>
'''RCLR''' Radio Communications Link Repeater<br>
<br>
'''RCLS''' Runway Centerline Light System<br>
<br>
'''RCLT''' Radio Communications Link Terminal<br>
<br>
'''RCMD''' Recommend<br>
<br>
'''RCN''' Royal Canadian Navy<br>
<br>
'''RCO''' Remote Communication Outlet<br>
<br>
'''RCOM''' En Route Communications<br>
<br>
'''RCON''' Reconfiguration<br>
<br>
'''RCPT''' Receipt<br>
<br>
'''RCR''' Runway Condition Reading<br>
<br>
'''RCRD''' Record<br>
<br>
'''RCS''' Rehost Computer System<br>
<br>
'''RCV''' Receive<br>
<br>
'''RCVNO''' Receiving Capability Out<br>
<br>
'''RDARA''' Regional and Domestic Air Route Area<br>
<br>
'''RDAT''' Radar Data<br>
<br>
'''RDC''' Reduce<br>
<br>
'''RDG''' Ridge<br>
<br>
'''RDH''' Reference Datum Height (ILS)<br>
<br>
'''RDL''' Radial<br>
<br>
'''RDO''' Radio<br>
<br>
'''RDS''' Radius<br>
<br>
'''RDSP''' Redispatch<br>
<br>
'''RDSPA''' Redispatch Accepted<br>
<br>
'''RDWND''' Radar Dome Wind<br>
<br>
'''RE''' Regard<br>
<br>
'''REC''' Receive or receiver<br>
<br>
'''RECLR''' Recleared<br>
<br>
'''RECON''' Reconnaissance<br>
<br>
'''RECON''' Reference Conversation<br>
<br>
'''REDL''' Runway Edge Light<br>
<br>
'''REF''' Reference<br>
<br>
'''REFONE''' Reference our telephone conversation<br>
<br>
'''REFORM''' Reference Form<br>
<br>
'''REG''' Registration<br>
<br>
'''REG''' Regulation<br>
<br>
'''REGAL''' Range and Elevation Guidance for Approach and Landing<br>
<br>
'''REIB''' Report Established in Block<br>
<br>
'''REIL''' Runway End Identifier Lights<br>
<br>
'''REINV''' Reference Invoice<br>
<br>
'''RELBL''' Reliable<br>
<br>
'''RELCT''' Relocate<br>
<br>
'''RELET''' Reference Letter<br>
<br>
'''REMES''' Reference Message<br>
<br>
'''REMT''' Relief Electronic Maintenance Technician<br>
<br>
'''RENL''' Runway End Light<br>
<br>
'''RENOT''' Regional Office Notice<br>
<br>
'''REOC''' Report When Established On Course<br>
<br>
'''REP''' Report or reporting point<br>
<br>
'''REP''' Represent or representative<br>
<br>
'''REP''' Research Project<br>
<br>
'''REPAML''' Reply By Airmail<br>
<br>
'''REPBS''' Reference PBS message<br>
<br>
'''REPERF''' Reperforator<br>
<br>
'''REPMES''' Reply By Message<br>
<br>
'''REPML''' Reply By Mail<br>
<br>
'''REPTWX''' Reply By TWX<br>
<br>
'''REQ''' Request<br>
<br>
'''REQID''' Request If Desired<br>
<br>
'''REQON''' Request Consideration<br>
<br>
'''REQRCM''' Request Your Recommendation<br>
<br>
'''REQSTD''' Requested<br>
<br>
'''RERTE''' Reroute<br>
<br>
'''RES''' Reserve<br>
<br>
'''RES''' Resident<br>
<br>
'''RESA''' Runway End Safety Area<br>
<br>
'''RESP''' Response<br>
<br>
'''RESTR''' Restrict<br>
<br>
'''REWRC''' Report When Established Well to Right of Course<br>
<br>
'''RF''' Radar Facility<br>
<br>
'''RF''' Radio Frequency<br>
<br>
'''RF''' Reception Fair<br>
<br>
'''RFA''' Request Further Airways<br>
<br>
'''RFI''' Radio Frequency Interference<br>
<br>
'''RFI''' Ready For Issue<br>
<br>
'''RFL''' Refuel<br>
<br>
'''RFS''' Refuse<br>
<br>
'''RFTO''' Ready For Takeoff<br>
<br>
'''RG''' Range (lights)<br>
<br>
'''RG''' Reception good<br>
<br>
'''RGD''' Ragged<br>
<br>
'''RGLR''' Regular<br>
<br>
'''RGN''' Region<br>
<br>
'''RH''' Relative Humidity<br>
<br>
'''RHC''' Right Hand Circuit<br>
<br>
'''RHI''' Range Height Indicator<br>
<br>
'''RHINO''' Radar Echo Height Information Not Available<br>
<br>
'''RHINO''' Radar Range Height Indicator Not Operating on Scan<br>
<br>
'''RIF''' Reclearance In Flight<br>
<br>
'''RIF''' Reduction In Force<br>
<br>
'''RIMAT''' Must Ride Company Material<br>
<br>
'''RIOGD''' Rio Grande<br>
<br>
'''RIS''' Reports Identification Symbol<br>
<br>
'''RITC''' Request in Trail Climb<br>
<br>
'''RITD''' Request in Trail Descent<br>
<br>
'''RITE''' Right (direction of turn)<br>
<br>
'''RL''' Report immediately upon leaving<br>
<br>
'''RL''' Report Leaving<br>
<br>
'''RLA''' Relay To<br>
<br>
'''RLANO''' Relay equipment out of operation<br>
<br>
'''RLAOK''' Relay equipment resumed operation<br>
<br>
'''RLBG''' Relative Bearing<br>
<br>
'''RLC''' Report Landing Completed<br>
<br>
'''RLCE''' Request Level Change En Route<br>
<br>
'''RLETFL''' Report Leaving Each Thousand Foot Level<br>
<br>
'''RLLS''' Runway Leading Lighting System<br>
<br>
'''RLNA''' Request Level Not Available<br>
<br>
'''RLS''' Release<br>
<br>
'''RLSTN''' Relay Station<br>
<br>
'''RLTK''' Rhumbline Track<br>
<br>
'''RLTV''' Relative<br>
<br>
'''RLV''' Relieve<br>
<br>
'''RLVL''' Report Level<br>
<br>
'''RM''' Remarks<br>
<br>
'''RMK''' Remark<br>
<br>
'''RMLR''' Radar Microwave Link Repeater<br>
<br>
'''RMLT''' Radar Microwave Link Terminal<br>
<br>
'''RMN''' Remain<br>
<br>
'''RMPCK''' Ramp Check<br>
<br>
'''RMRK''' Remark<br>
<br>
'''RN''' Reception Nil<br>
<br>
'''RNAV''' Area Navigation<br>
<br>
'''RNFL''' Rainfall<br>
<br>
'''RNG''' Army National Guard<br>
<br>
'''RNG''' Radio Range<br>
<br>
'''RNLS''' Resume Normal Speed<br>
<br>
'''RNP''' Required Navigation Performance<br>
<br>
'''RO''' Regional Office<br>
<br>
'''RO''' Regulated Output<br>
<br>
'''ROBEPS''' Radar Operating Below Prescribed Standard<br>
<br>
'''ROBEX''' Regional OPMET Bulletin Exchange<br>
<br>
'''ROC''' Rate of Climb<br>
<br>
'''ROCC''' NORAD Region Operations Control Center<br>
<br>
'''ROD''' Rate of Descent<br>
<br>
'''RODA''' Regardless of Destination Airport<br>
<br>
'''ROFOR''' Route Forecast<br>
<br>
'''ROLET''' Reference Letter from our office<br>
<br>
'''ROMEMO''' Reference Our Memorandum<br>
<br>
'''ROMES''' Reference Message from our office<br>
<br>
'''RON''' Remaining Overnight<br>
<br>
'''ROPBS''' Reference PBS message from our office<br>
<br>
'''RORQN''' Reference requisition from our office<br>
<br>
'''RORU''' Rest Of Route Unchanged<br>
<br>
'''ROT''' Rotate<br>
<br>
'''ROTEL''' Reference telegram from our office<br>
<br>
'''ROTG''' Rotating<br>
<br>
'''ROTWX''' Reference our TWX<br>
<br>
'''ROV''' Report Over<br>
<br>
'''RP''' Reception Poor (radio logs only)<br>
<br>
'''RP''' Right Traffic Pattern<br>
<br>
'''RPA''' Request Present Altitude<br>
<br>
'''RPD''' Rapid<br>
<br>
'''RPFOD''' Reported For Duty<br>
<br>
'''RPI''' Radar Position Indicator<br>
<br>
'''RPL''' Repetitive Flight Plan<br>
<br>
'''RPLC''' Replace<br>
<br>
'''RPM''' Rotation Per Minute<br>
<br>
'''RPOC''' Report Proceeding On Course<br>
<br>
'''RPR''' Repair<br>
<br>
'''RPRT''' Report<br>
<br>
'''RPS''' Radar Position Symbol<br>
<br>
'''RPSG''' Report Passing<br>
<br>
'''RPT''' Repeat<br>
<br>
'''RPT''' Repeat or I repeat<br>
<br>
'''RQ''' Indication of a request<br>
<br>
'''RQ''' Request<br>
<br>
'''RQCL''' Request Clearance<br>
<br>
'''RQDCZ''' Request Clearance to Depart VFR and Leave Control Zone at<br>
<br>
'''RQECZ''' Request Clearance to Enter Control Zone VFR at<br>
<br>
'''RQMNTS''' Requirements<br>
<br>
'''RQN''' Requisition<br>
<br>
'''RQOF''' Request on File<br>
<br>
'''RQP''' Request Flight Plan<br>
<br>
'''RQP''' Request Permission<br>
<br>
'''RQPP''' Request Present Position<br>
<br>
'''RQR''' Require<br>
<br>
'''RQRP''' Request Reply<br>
<br>
'''RQS''' Request Supplementary Flight Plan<br>
<br>
'''RQTAO''' Request Time and Altitude Over<br>
<br>
'''RR''' Low or medium frequency radio range stations<br>
<br>
'''RR''' Radar Range Station<br>
<br>
'''RR''' Report immediately upon reaching<br>
<br>
'''RR''' Report Reaching<br>
<br>
'''RRBN''' Round Robin<br>
<br>
'''RRCVR''' Remote Receiver<br>
<br>
'''RRL''' Runway Remaining Lights<br>
<br>
'''RRP''' Runway Reference Point<br>
<br>
'''RRPD''' Runway Reference Point Downwind<br>
<br>
'''RRPU''' Runway Reference Point Upwind<br>
<br>
'''RRS''' Remainder of Same Route<br>
<br>
'''RRTE''' Reroute<br>
<br>
'''RS''' Receiver Station<br>
<br>
'''RS''' Record Special Observation (weather reports only)<br>
<br>
'''RS''' Right Side<br>
<br>
'''RSC''' Rescue Subcenter<br>
<br>
'''RSCD''' Runway Surface Condition<br>
<br>
'''RSCU''' Rescue<br>
<br>
'''RSG''' Rising<br>
<br>
'''RSN''' Reason<br>
<br>
'''RSOPN''' Resumed Operation<br>
<br>
'''RSP''' Responder Beacon<br>
<br>
'''RSR''' En Route Surveillance Radar<br>
<br>
'''RSTR''' Restrict<br>
<br>
'''RSU''' Runway Supervisory Unit<br>
<br>
'''RSVN''' Reservation<br>
<br>
'''RT''' Right turn after takeoff<br>
<br>
'''RT''' Round Trip<br>
<br>
'''RTB''' Return To Base<br>
<br>
'''RTD''' Delayed<br>
<br>
'''RTE''' Route<br>
<br>
'''RTF''' Radiotelephone<br>
<br>
'''RTG''' Radiotelegraph<br>
<br>
'''RTHL''' Runway Threshold Light<br>
<br>
'''RTMTR''' Remote Transmitter<br>
<br>
'''RTN''' Return<br>
<br>
'''RTND''' Retained<br>
<br>
'''RTNE''' Routine<br>
<br>
'''RTO''' Report Time Over<br>
<br>
'''RTR''' Remote Transmitter/Receiver<br>
<br>
'''RTR''' Returning To Ramp<br>
<br>
'''RTRD''' Retard<br>
<br>
'''RTRN''' Return<br>
<br>
'''RTS''' Return To Service<br>
<br>
'''RTT''' Radio Teletypewriter<br>
<br>
'''RTX''' Report time crossing<br>
<br>
'''RTZL''' Runway Touchdown Zone Light<br>
<br>
'''RUF''' Rough<br>
<br>
'''RUFORM''' Reference your form<br>
<br>
'''RULET''' Reference letter from your office<br>
<br>
'''RUMEMO''' Reference your memorandum<br>
<br>
'''RUMES''' Reference message from your office<br>
<br>
'''RURQN''' Reference requisition from your office<br>
<br>
'''RUT''' Standard regional route transmitting frequencies<br>
<br>
'''RUTEL''' Reference telegram from your office<br>
<br>
'''RUTWX''' Reference your TWX<br>
<br>
'''RV''' Radar Vector<br>
<br>
'''RV''' Rescue Vessel<br>
<br>
'''RVO''' Runway Visibility by Observer<br>
<br>
'''RVR''' Runway Visual Range<br>
<br>
'''RVRA''' Runway Visual Range (RVR) ten minute average<br>
<br>
'''RVRANO''' Runway Visual Range (RVR) ten minute average not available<br>
<br>
'''RVRENO''' Runway Visual Range (RVR) ten minute extremes not available<br>
<br>
'''RVRM''' Runway Visual Range (RVR) midpoint<br>
<br>
'''RVRMNO''' Runway Visual Range (RVR) midpoint not available<br>
<br>
'''RVRNO''' Runway Visual Range (RVR) not available<br>
<br>
'''RVRR''' Runway Visual Range (RVR) rollout<br>
<br>
'''RVRRNO''' Runway Visual Range (RVR) rollout not available<br>
<br>
'''RVRT''' Runway Visual Range (RVR) touchdown<br>
<br>
'''RVRTNO''' Runway Visual Range (RVR) touchdown not available<br>
<br>
'''RVS''' Revise<br>
<br>
'''RVV''' Runway Visibility Value<br>
<br>
'''RVSM''' Reduced Vertical Separation Minimums<br>
<br>
'''RVVNO''' RVV not available<br>
<br>
'''RWRC''' Remain Well to Right of Course<br>
<br>
'''RWY''' Runway<br>
<br>
'''RY''' Runway<br>
<br>
</div>
 
== S ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''S''' South or southern latitude<br>
<br>
'''S/A''' Semiannual<br>
<br>
'''S/RC''' Send/Receive Center<br>
<br>
'''SA''' Duststorm, sandstorm, rising dust or sand<br>
<br>
'''SA''' Record Observation (weather reports only)<br>
<br>
'''SA''' Sandstorm or dusting<br>
<br>
'''SA''' Surveillance Approach<br>
<br>
'''SABH''' Simultaneous Automatic Broadcast Homer<br>
<br>
'''SADT''' Same Direction Traffic<br>
<br>
'''SAFI''' Semiautomatic Flight Inspection<br>
<br>
'''SAFI''' Semiautomatic Flight Inspection Aircraft<br>
<br>
'''SALS''' Short Approach Lighting System<br>
<br>
'''SALS''' Simple Approach Lighting System<br>
<br>
'''SALSF''' Short Approach Lighting System with Sequenced Flashing Lights<br>
<br>
'''SAN''' Sanitary<br>
<br>
'''SAO''' Surface Aviation Observation<br>
<br>
'''SAP''' Soon As Possible<br>
<br>
'''SAPD''' Speed at Pilots Discretion<br>
<br>
'''SAR''' Search and Rescue<br>
<br>
'''SARPS''' Standards and Recommended Practices<br>
<br>
'''SASK''' Saskhewan<br>
<br>
'''SATFY''' Satisfy or satisfactory<br>
<br>
'''SATR''' So As To Reach<br>
<br>
'''SAVASI''' Simplified Abbreviated Visual Approach Slope Indicator<br>
<br>
'''SAWRS''' Supplementary Aviation Weather Reporting Station<br>
<br>
'''SAYTA''' Say Time Able<br>
<br>
'''SB''' Southbound<br>
<br>
'''SBAS''' Satellite-Based Augmentation System<br>
<br>
'''SBFC''' Standby For Further Clearance<br>
<br>
'''SBND''' Southbound<br>
<br>
'''SBSD''' Subside<br>
<br>
'''SC''' Stratocumulus<br>
<br>
'''SCAN''' Self Correcting Automatic Navigation<br>
<br>
'''SCANO''' Automatic Scanning Unit Out of Service<br>
<br>
'''SCAOK''' Automatic Scanning Unit Returned to Service<br>
<br>
'''SCAT''' Security Control of Air Traffic<br>
<br>
'''SCATANA''' Security Control of Air Traffic and Air Navigation Aids<br>
<br>
'''SCC''' System Command Center<br>
<br>
'''SCLN''' Semicolon<br>
<br>
'''SCND''' Second (in line)<br>
<br>
'''SCS''' Single Channel Simplex<br>
<br>
'''SCSL''' Standing Lenticular Stratocumulus<br>
<br>
'''SCT''' Scattered<br>
<br>
'''SCTR''' Sector<br>
<br>
'''SCTY''' Security<br>
<br>
'''SDB''' Scheduled Data Base<br>
<br>
'''SDBY''' Standby<br>
<br>
'''SDF''' Simplified Directional Facility<br>
<br>
'''SE''' Southeast<br>
<br>
'''SE''' System Engineer<br>
<br>
'''SEADRM''' Seadrome<br>
<br>
'''SEB''' South Eastbound<br>
<br>
'''SEC''' Second (time)<br>
<br>
'''SECMR''' Sector Manager<br>
<br>
'''SECRA''' Secondary Radar<br>
<br>
'''SECT''' Sector<br>
<br>
'''SEL''' Space Environment Laboratory<br>
<br>
'''SELCAL''' Selective Calling<br>
<br>
'''SELS''' Severe Local Storms<br>
<br>
'''SELY''' South Easterly (weather reports only)<br>
<br>
'''SENS''' Sensitivity<br>
<br>
'''SEPN''' Separation<br>
<br>
'''SEQ''' Sequence<br>
<br>
'''SER''' Service<br>
<br>
'''SERN''' South Eastern<br>
<br>
'''SES''' Supervisory Electronics Specialist<br>
<br>
'''SESC''' Space Environment Service Center<br>
<br>
'''SET''' Stack Entry Time<br>
<br>
'''SEV''' Severe<br>
<br>
'''SF''' Standard Form<br>
<br>
'''SFA''' Single Frequency Approach<br>
<br>
'''SFC''' Surface<br>
<br>
'''SFERICS''' Atmospherics<br>
<br>
'''SFL''' Sequence Flashing Lights<br>
<br>
'''SFO''' Sector Field Office<br>
<br>
'''SFO''' Simulated Flame Out<br>
<br>
'''SFPP''' Stored Flight Plan Program<br>
<br>
'''SFU''' Sector Field Unit<br>
<br>
'''SG''' Snow Grains (weather reports only)<br>
<br>
'''SGD''' Signed<br>
<br>
'''SGD''' Solar Geophysical Data<br>
<br>
'''SGFNT''' Significant<br>
<br>
'''SGL''' Signal<br>
<br>
'''SH''' Showers<br>
<br>
'''SHF''' Super High Frequency<br>
<br>
'''SHFT''' Shift<br>
<br>
'''SHGR''' Hail Showers<br>
<br>
'''SHGS''' Hail Showers (small)<br>
<br>
'''SHLW''' Shallow<br>
<br>
'''SHORN''' Short Range Navigation System<br>
<br>
'''SHP''' Standard Holding Procedure<br>
<br>
'''SHPL''' Ice Pellet Showers<br>
<br>
'''SHRA''' Rain Showers<br>
<br>
'''SHRT''' Short<br>
<br>
'''SHRTLY''' Shortly<br>
<br>
'''SHRTWV''' Shortwave<br>
<br>
'''SHSN''' Snow Showers<br>
<br>
'''SHTDN''' Shutdown<br>
<br>
'''SHUD''' Should<br>
<br>
'''SHWR''' Shower<br>
<br>
'''SI''' Straight In Approach<br>
<br>
'''SIA''' Standard Instrument Approach<br>
<br>
'''SIAP''' Standard Instrument Approach Procedure<br>
<br>
'''SID''' Standard Instrument Departure<br>
<br>
'''SIERNEV''' Sierra Nevada<br>
<br>
'''SIF''' Selective Identification Feature<br>
<br>
'''SIG''' Signature<br>
<br>
'''SIGMET''' Significant Meteorological Information<br>
<br>
'''SIGWX''' Significant Weather<br>
<br>
'''SIM''' Simulated Approach<br>
<br>
'''SIMUL''' Simultaneous<br>
<br>
'''SIR''' Snow and Ice on Runway<br>
<br>
'''SIWL''' Single Isolated Wheel Load<br>
<br>
'''SJP''' Standard Jet Penetration<br>
<br>
'''SK''' Sky condition<br>
<br>
'''SKC''' Sky clear<br>
<br>
'''SKED''' Schedule<br>
<br>
'''SL''' Sea Level<br>
<br>
'''SL''' Sick Leave<br>
<br>
'''SLCT''' Select<br>
<br>
'''SLD''' Solid<br>
<br>
'''SLGT''' Slight<br>
<br>
'''SLMM''' Simultaneous Compass Locator at Middle Marker<br>
<br>
'''SLO''' Slow<br>
<br>
'''SLOM''' Simultaneous Compass Locator at Outer Marker<br>
<br>
'''SLP''' Sea Level Pressure<br>
<br>
'''SLP''' Slope<br>
<br>
'''SLP''' Speed Limiting Point<br>
<br>
'''SLR''' Slush on Runway<br>
<br>
'''SLRAP''' Standard Low Frequency Range Approach<br>
<br>
'''SLS''' Side Lobe Suppression<br>
<br>
'''SLT''' Sleet<br>
<br>
'''SLW''' Slow<br>
<br>
'''SM''' Statute Mile<br>
<br>
'''SMC''' Squawk Mode Code<br>
<br>
'''SMC''' Surface Movement Control<br>
<br>
'''SML''' Small<br>
<br>
'''SMR''' Statute Mile Radius<br>
<br>
'''SMR''' Surface Movement Radar<br>
<br>
'''SMRY''' Summary<br>
<br>
'''SMS''' Synchronous Meteorological Satellite<br>
<br>
'''SMS''' Systems Maintenance Sector<br>
<br>
'''SMT''' Submit<br>
<br>
'''SMTH''' Smooth<br>
<br>
'''SMTM''' Sometime<br>
<br>
'''SMWHT''' Somewhat<br>
<br>
'''SN''' Snow<br>
<br>
'''SN''' Strategic Navigation<br>
<br>
'''SN''' Systems Navigation<br>
<br>
'''SNBNK''' Snowbank<br>
<br>
'''SND''' Sand or sanded or sanding<br>
<br>
'''SNFLK''' Snowflake<br>
<br>
'''SNGL''' Single<br>
<br>
'''SNOINCR''' Snow depth increase in past hour<br>
<br>
'''SNOWTAM''' NOTAM reporting the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush or ice on the movement area<br>
<br>
'''SNSH''' Snow Showers<br>
<br>
'''SNW''' Snow<br>
<br>
'''SNWFL''' Snowfall<br>
<br>
'''SOAP''' Spectrometric Oil Analysis Program<br>
<br>
'''SOB''' Souls On Board<br>
<br>
'''SOCC''' NORAD Sector Operations Control Center<br>
<br>
'''SOM''' Satellite Communication<br>
<br>
'''SOMSG''' See Our Message<br>
<br>
'''SOP''' Standard Operating Procedure<br>
<br>
'''SORAP''' Standard Omni Range Approach<br>
<br>
'''SP''' Standard Holding Pattern<br>
<br>
'''SP''' Station Pressure<br>
<br>
'''SPAN''' Stored Program for Alpha Numerics<br>
<br>
'''SPB''' Seaplane Base<br>
<br>
'''SPCLY''' Especially<br>
<br>
'''SPD''' Speed<br>
<br>
'''SPEC''' Specification<br>
<br>
'''SPECI''' Aviation selected special weather report<br>
<br>
'''SPKL''' Sprinkle<br>
<br>
'''SPL''' Special<br>
<br>
'''SPL''' Supplementary Flight Plan<br>
<br>
'''SPLNS''' South Plains<br>
<br>
'''SPO''' Strategic Plan of Operation<br>
<br>
'''SPOT''' Spot Wind<br>
<br>
'''SPRD''' Spread<br>
<br>
'''SPRL''' Spiral<br>
<br>
'''SPS''' Standard Positioning Service<br>
<br>
'''SPT''' Strategic Planning Team<br>
<br>
'''SQ''' Squall<br>
<br>
'''SQDN''' Squadron<br>
<br>
'''SQK''' Squawk<br>
<br>
'''SQLN''' Squall Line<br>
<br>
'''SR''' Standard Range Approach<br>
<br>
'''SR''' Sunrise<br>
<br>
'''SRA''' Surveillance Radar Approach<br>
<br>
'''SRCH''' Search<br>
<br>
'''SRE''' Surveillance Radar Element of precision approach radar system<br>
<br>
'''SRG''' Short Range<br>
<br>
'''SRND''' Surround<br>
<br>
'''SRPN''' Special Requisition Priority Number<br>
<br>
'''SRR''' Search and Rescue Region<br>
<br>
'''SRY''' Secondary<br>
<br>
'''SS''' Sandstorm<br>
<br>
'''SS''' Sunset<br>
<br>
'''SSALF''' Simplified Short Approach Lighting System with Sequenced Flashers<br>
<br>
'''SSALR'''  Simplified Short Approach Lighting System with Runway Alignment Indicator Lights<br>
<br>
'''SSALS'''  Simplified Short Approach Lighting System<br>
<br>
'''SSB''' Single Side Band<br>
<br>
'''SSE''' South South East<br>
<br>
'''SSERN''' South South Eastern<br>
<br>
'''SSEWD''' South South Eastward<br>
<br>
'''SSNO''' Request no SIDs or STARs<br>
<br>
'''SSR''' Secondary Surveillance Radar<br>
<br>
'''SST''' Supersonic Transport<br>
<br>
'''SSW''' South South West<br>
<br>
'''SSWRN''' South South Western<br>
<br>
'''SSWWD''' South South Westward<br>
<br>
'''ST''' Saint<br>
<br>
'''ST''' Stratus<br>
<br>
'''STA''' Straight In Approach<br>
<br>
'''STADMR''' Station Administrator<br>
<br>
'''STAGN''' Stagnation<br>
<br>
'''STALO''' Stabilized Local Oscillator<br>
<br>
'''STAR''' Standard Terminal Arrival<br>
<br>
'''STATE''' Military, customs, or police services<br>
<br>
'''STBL''' Stable<br>
<br>
'''STCLB''' Start Climb<br>
<br>
'''STD''' Standard<br>
<br>
'''STDST''' Start Descent<br>
<br>
'''STDY''' Steady<br>
<br>
'''STF''' Stratiform<br>
<br>
'''STFRA''' Stratus Fractus<br>
<br>
'''STFRM''' Stratiform<br>
<br>
'''STG''' Strong<br>
<br>
'''STLT''' Satellite<br>
<br>
'''STM''' Storm<br>
<br>
'''STMGR''' Station Manager<br>
<br>
'''STMP''' Special Traffic Management Program<br>
<br>
'''STN''' Station<br>
<br>
'''STNR''' Stationary<br>
<br>
'''STNRY''' Stationary<br>
<br>
'''STOL''' Short Takeoff and Landing<br>
<br>
'''STR''' Subject Terminal Control Release<br>
<br>
'''STRO''' Stereo Routes<br>
<br>
'''STS''' Status<br>
<br>
'''STWL''' Stopway Light<br>
<br>
'''STWY''' Stopway<br>
<br>
'''SUA''' Special Use Airspace<br>
<br>
'''SUB''' Substitute<br>
<br>
'''SUBFIX''' Subject to Correction<br>
<br>
'''SUBJ''' Subject to<br>
<br>
'''SUF''' Sufficient<br>
<br>
'''SUG''' Suggest<br>
<br>
'''SUP''' Supply<br>
<br>
'''SUPCHG''' Supercharge<br>
<br>
'''SUPPL''' Supplement<br>
<br>
'''SUPPS''' Regional Supplementary Procedures<br>
<br>
'''SUPR''' Superior<br>
<br>
'''SUPSD''' Supersede<br>
<br>
'''SUPT''' Superintendent<br>
<br>
'''SUPVR''' Supervisor<br>
<br>
'''SURPIC''' Surface Picture<br>
<br>
'''SUSP''' Suspend<br>
<br>
'''SVC''' Service<br>
<br>
'''SVCBL''' Serviceable<br>
<br>
'''SVFR''' Special VFR<br>
<br>
'''SVG''' Serving<br>
<br>
'''SVN''' Space Vehicle Number<br>
<br>
'''SVR''' Severe<br>
<br>
'''SVRL''' Several<br>
<br>
'''SW''' South West<br>
<br>
'''SWAP''' Severe Weather Avoidance Plan<br>
<br>
'''SWB''' Scheduled Weather Broadcast<br>
<br>
'''SWB''' South Westbound<br>
<br>
'''SWLG''' Swelling<br>
<br>
'''SWLY''' South Westerly<br>
<br>
'''SWRN''' South Western<br>
<br>
'''SWSL''' Supplemental Weather Wervice Location<br>
<br>
'''SWY''' Stopway<br>
<br>
'''SX''' Stability Index<br>
<br>
'''SXN''' Section<br>
<br>
'''SYD''' Release Subject Your Discretion<br>
<br>
'''SYNOP''' Synoptic<br>
<br>
'''SYNS''' Synopsis<br>
<br>
'''SYS''' See Your Service<br>
<br>
'''SYS''' System<br>
<br>
</div>
 
== T ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''T''' Temperature<br>
<br>
'''T''' Trace (weather reports only)<br>
<br>
'''T''' Training<br>
<br>
'''T''' Tropical (air mass)<br>
<br>
'''T''' True (bearing)<br>
<br>
'''T/R''' Transportation Request<br>
<br>
'''TA''' Temperature (PIREP only)<br>
<br>
'''TA''' Total Aboard<br>
<br>
'''TA''' Transition Altitude<br>
<br>
'''TAC''' Terminal Area Chart<br>
<br>
'''TACAN''' Tactical Air Navigational Aid<br>
<br>
'''TACLO''' Tactical Air Command Liaison Officer<br>
<br>
'''TACR''' Tactical Air Navigation<br>
<br>
'''TAD'''  Tower Approach and Departure Control Facility<br>
<br>
'''TAF''' Terminal Aerodrome Forecast<br>
<br>
'''TAIL''' Tail Wind<br>
<br>
'''TAND''' Tandem<br>
<br>
'''TANDA''' Time and Attendance Report<br>
<br>
'''TAO''' TACAN only<br>
<br>
'''TAO''' Time and Altitude Over<br>
<br>
'''TAPER''' Temporary Appointment Pending Establishment of a Register<br>
<br>
'''TAR''' Terminal Area Surveillance Radar<br>
<br>
'''TARND''' Turn Around<br>
<br>
'''TARS''' Terminal Automated Radar Services<br>
<br>
'''TARS''' Tethered Aerostat Radar System<br>
<br>
'''TAS''' True Air Speed<br>
<br>
'''TASR''' Terminal Area Surveillance Radar<br>
<br>
'''TAWOG''' Travel Arrangements Without Government Expense<br>
<br>
'''TB''' Turbulence (PIREP only)<br>
<br>
'''TBJT''' Turbojet<br>
<br>
'''TC''' Time Check<br>
<br>
'''TC''' Tropical Cyclone<br>
<br>
'''TCA''' Tactical Customer Advocate<br>
<br>
'''TCA''' Terminal Control Area<br>
<br>
'''TCAS''' Traffic Alert and Collision Avoidance System<br>
<br>
'''TCH''' Threshold Crossing Height<br>
<br>
'''TCHD''' Threshold Crossing Height Downwind<br>
<br>
'''TCHU''' Threshold Crossing Height Upwind<br>
<br>
'''TCNTL''' Transcontinental<br>
<br>
'''TCOM''' Terminal Communications<br>
<br>
'''TCP''' Transfer of Control Point<br>
<br>
'''TCU''' Towering Cumulus<br>
<br>
'''TD''' Touchdown<br>
<br>
'''TD''' Transmitter Distributor<br>
<br>
'''TDA''' Today<br>
<br>
'''TDEL''' Time Delay<br>
<br>
'''TDLS''' Terminal Data Link System<br>
<br>
'''TDO''' Tornado<br>
<br>
'''TDOP''' Time Dilution of Precision<br>
<br>
'''TDWR''' Terminal Doppler Weather Radar<br>
<br>
'''TDY''' Temporary Duty<br>
<br>
'''TDZ''' Touchdown Zone<br>
<br>
'''TDZE''' Touchdown Zone Elevation<br>
<br>
'''TDZL''' Touchdown Zone Light (system)<br>
<br>
'''TEC''' Tower En Route Control<br>
<br>
'''TECA''' Tower En Route Control Area<br>
<br>
'''TECR''' Technical Reason<br>
<br>
'''TEL''' Telecommunications<br>
<br>
'''TEL''' Telephone<br>
<br>
'''TELAU''' Teleautograph<br>
<br>
'''TELCO''' Telephone Company<br>
<br>
'''TELCON''' Telephone Conference<br>
<br>
'''TELEX''' Telephone Exchange<br>
<br>
'''TELRY''' Telegraph Reply<br>
<br>
'''TEMP''' Temperature<br>
<br>
'''TEMPO''' Temporary<br>
<br>
'''TEND''' Trend<br>
<br>
'''TERPS''' Terminal Instrument Procedures<br>
<br>
'''TET''' Tetrahedron<br>
<br>
'''TF''' Terrain Following<br>
<br>
'''TFC''' Traffic<br>
<br>
'''TFMS''' Traffic Flow Management System<br>
<br>
'''TFR''' Temporary Flight Restriction<br>
<br>
'''TFRCD''' Traffic Received<br>
<br>
'''TFZ''' Traffic Zone<br>
<br>
'''TGL''' Touch and Go Landing<br>
<br>
'''TGS''' Taxiing Guidance System<br>
<br>
'''THD''' Thunderhead<br>
<br>
'''THDR''' Thunder<br>
<br>
'''THK''' Thick<br>
<br>
'''THLD''' Threshold<br>
<br>
'''THN''' Thin<br>
<br>
'''THR''' Threshold<br>
<br>
'''THRFTR''' Thereafter<br>
<br>
'''THRU''' Through<br>
<br>
'''THRUT''' Throughout<br>
<br>
'''THSD''' Thousand<br>
<br>
'''THTN''' Threaten<br>
<br>
'''TIBA''' Traffic Information Broadcast by Aircraft<br>
<br>
'''TIL''' Until<br>
<br>
'''TINOP''' Transponder Inoperative<br>
<br>
'''TIP''' Until Past<br>
<br>
'''TIPS''' Terminal Information Processing System<br>
<br>
'''TKOF''' Takeoff<br>
<br>
'''TLM''' Telemetry<br>
<br>
'''TLRNC''' Tolerance<br>
<br>
'''TLTP''' Too Long To Print<br>
<br>
'''TLWD''' Tailwind<br>
<br>
'''TM''' Time (PIREP only)<br>
<br>
'''TM''' Traffic Management<br>
<br>
'''TMA''' Terminal Control Area<br>
<br>
'''TMPA''' Traffic Management Program Alert<br>
<br>
'''TMPRY''' Temporary<br>
<br>
'''TMT''' Transmit<br>
<br>
'''TMW''' Tomorrow<br>
<br>
'''TNA''' Turn Altitude<br>
<br>
'''TNDCY''' Tendency<br>
<br>
'''TNGT''' Tonight<br>
<br>
'''TNH''' Turn Height<br>
<br>
'''TNTV''' Tentative<br>
<br>
'''TO''' Travel Order<br>
<br>
'''TOC''' To Be Continued<br>
<br>
'''TOC''' Top of Climb<br>
<br>
'''TOD''' Time of Delivery<br>
<br>
'''TODA''' Takeoff Distance Available<br>
<br>
'''TOG''' Takeoff Gross Weight<br>
<br>
'''TOP''' Cloud top<br>
<br>
'''TOR''' Time of Receipt<br>
<br>
'''TOR''' Traffic on Request<br>
<br>
'''TORA''' Takeoff Run Available<br>
<br>
'''TOT''' Time of Transmission<br>
<br>
'''TOVC''' Top of Overcast<br>
<br>
'''TP''' Turning Point<br>
<br>
'''TP''' Type Aircraft (PIREP only)<br>
<br>
'''TPA''' Traffic Pattern Altitude<br>
<br>
'''TPG''' Topping<br>
<br>
'''TR''' Track<br>
<br>
'''TR''' VFR low altitude training routes<br>
<br>
'''TRA''' Temporary Reserved Airspace<br>
<br>
'''TRACAB''' Terminal Radar Approach Control in Tower Cab<br>
<br>
'''TRACON''' Terminal Radar Approach Control Facility<br>
<br>
'''TRAD''' Terminal Radar<br>
<br>
'''TRAN''' Transient<br>
<br>
'''TRANS''' Transmit or transmitter<br>
<br>
'''TRBL''' Trouble<br>
<br>
'''TRCV''' Tricolor Visual Approach Slope Indicator<br>
<br>
'''TRG''' Training<br>
<br>
'''TRIB''' Tributary<br>
<br>
'''TRK''' Track<br>
<br>
'''TRLVL''' Transition Level<br>
<br>
'''TRML''' Terminal<br>
<br>
'''TRMT''' Terminate<br>
<br>
'''TRNG''' Training<br>
<br>
'''TRNSP''' Transport<br>
<br>
'''TROF''' Trough<br>
<br>
'''TROP''' Tropopause<br>
<br>
'''TRPCD''' Tropical Continental (air mass)<br>
<br>
'''TRPCL''' Tropical<br>
<br>
'''TRPLYR''' Trapping Layer<br>
<br>
'''TRRN''' Terrain<br>
<br>
'''TRSA''' Terminal Radar Service Area<br>
<br>
'''TRSN''' Transition<br>
<br>
'''TRTD''' Treated<br>
<br>
'''TS''' Team Supervisor<br>
<br>
'''TS''' Thunderstorm<br>
<br>
'''TSA''' Transportation Security Administration<br>
<br>
'''TSATLC''' TransAtlantic<br>
<br>
'''TSEC''' Terminal Secondary Radar Beacon<br>
<br>
'''TSFR''' Transfer<br>
<br>
'''TSGR''' Thunderstorm with Hail<br>
<br>
'''TSGS''' Thunderstorm with Small Hail<br>
<br>
'''TSMNO''' Transmitting Capability out of Service<br>
<br>
'''TSMOK''' Transmitting Capability Returned to Service<br>
<br>
'''TSNO''' Thunderstorm Information Not Available<br>
<br>
'''TSNT''' Transient<br>
<br>
'''TSO''' Technical Standard Order<br>
<br>
'''TSPAC''' TransPacific<br>
<br>
'''TSPL''' Thunderstorm with Ice Pellets<br>
<br>
'''TSRA''' Thunderstorm with Rain<br>
<br>
'''TSSA''' Thunderstorm with Duststorm or sandstorm<br>
<br>
'''TSSN''' Thunderstorm with Snow<br>
<br>
'''TSTM''' Thunderstorm<br>
<br>
'''TT''' Teletypewriter<br>
<br>
'''TTS''' Teletype Switching Facilities<br>
<br>
'''TTY''' Teletypewriter Station<br>
<br>
'''TURB''' Turbulence<br>
<br>
'''TURBC''' Turbulence<br>
<br>
'''TURBT''' Turbulent<br>
<br>
'''TVASIS''' T Visual Approach Slope Indicator System<br>
<br>
'''TVL''' Travel<br>
<br>
'''TVOR''' Terminal VOR<br>
<br>
'''TWD''' Toward<br>
<br>
'''TWEB''' Transcribed Weather Broadcast<br>
<br>
'''TWI''' Twilight<br>
<br>
'''TWR''' Aerodrome Control Tower<br>
<br>
'''TWR''' Tower<br>
<br>
'''TWRG''' Towering<br>
<br>
'''TWS''' Radar Track While Scan<br>
<br>
'''TWX''' Teletypewriter Exchange Service<br>
<br>
'''TWY''' Taxiway<br>
<br>
'''TWYL''' Taxiway Link<br>
<br>
'''TXG''' Taxiing<br>
<br>
'''TXL''' Taxilane<br>
<br>
'''TXT''' Text<br>
<br>
'''TYP''' Type Aircraft<br>
<br>
'''TYPH''' Typhoon<br>
<br>
'''TYPNO''' Teletypewriter Communications Out of Service<br>
<br>
'''TYPOK''' Teletypewriter Communications Returned to Service<br>
<br>
</div>
 
== U ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''U''' Intensity Unknown (weather reports only)<br>
<br>
'''U/S''' Unserviceable<br>
<br>
'''UA''' Routine PIREP<br>
<br>
'''UA''' Unable to approve arrival for the time specified<br>
<br>
'''UAB''' Until Advised By<br>
<br>
'''UAC''' Upper Area Control Center<br>
<br>
'''UAG''' Upper Atmosphere Geophysics<br>
<br>
'''UAR''' Upper Air Route<br>
<br>
'''UAS''' Unmanned Aircraft Systems<br>
<br>
'''UAT''' Until Advised by the Tower<br>
<br>
'''UCDWN''' Until Cleared Down<br>
<br>
'''UCLT''' Until Cleared to Land by the Tower<br>
<br>
'''UD''' Unable to approve departure for the time specified<br>
<br>
'''UDDF''' Up and Down Drafts<br>
<br>
'''UDF''' Ultra High Frequency Direction Finding Station<br>
<br>
'''UERE''' User Equivalent Range Error<br>
<br>
'''UFA''' Until Further Advised<br>
<br>
'''UFN''' Until Further Notice<br>
<br>
'''UFO''' Unidentified Flying Object<br>
<br>
'''UHA''' Unable Higher Altitude<br>
<br>
'''UHDODT''' Unable Higher Due Opposite Direction Traffic<br>
<br>
'''UHDSDT''' Unable Higher Due Same Direction Traffic<br>
<br>
'''UHDT''' Unable Higher Due Traffic<br>
<br>
'''UHDT''' Unable Higher Due Traffic<br>
<br>
'''UHF''' Ultra High Frequency<br>
<br>
'''UIC''' Upper Information Center<br>
<br>
'''UIR''' Upper Flight Information Region<br>
<br>
'''ULDT''' Unable Lower Due Traffic<br>
<br>
'''ULR''' Ultra Long Range<br>
<br>
'''UM''' Unable to Maintain<br>
<br>
'''UN''' Unable<br>
<br>
'''UNA''' Unable<br>
<br>
'''UNAP''' Unable to Approve<br>
<br>
'''UNAPV''' Unable to Approve<br>
<br>
'''UNAR''' Unable to Approve Altitude Requested<br>
<br>
'''UNATNDD''' Unattended<br>
<br>
'''UNAVBL''' Unavailable<br>
<br>
'''UNCC''' Unable to Contact Company Radio<br>
<br>
'''UNDLD''' Undelivered<br>
<br>
'''UNEC''' Unnecessary<br>
<br>
'''UNHRD''' Unheard<br>
<br>
'''UNID''' Unidentified<br>
<br>
'''UNKN''' Unknown<br>
<br>
'''UNL''' Unlimited<br>
<br>
'''UNLGTD''' Unlighted<br>
<br>
'''UNMON''' Unable to Monitor<br>
<br>
'''UNMON''' Unmonitored<br>
<br>
'''UNOFFL''' Unofficial<br>
<br>
'''UNRDBL''' Unreadable<br>
<br>
'''UNREL''' Unreliable<br>
<br>
'''UNRELBL''' Unreliable<br>
<br>
'''UNRR''' Unable to Approve Route Requested<br>
<br>
'''UNRSTD''' Unrestricted<br>
<br>
'''UNSATFY''' Unsatisfactory<br>
<br>
'''UNSBL''' Unseasonable<br>
<br>
'''UNSKED''' Unscheduled<br>
<br>
'''UNSTBL''' Unstable<br>
<br>
'''UNSTDY''' Unsteady<br>
<br>
'''UNSTL''' Unsettle<br>
<br>
'''UNTC''' Unable to Establish Contact<br>
<br>
'''UNUSBL''' Unusable<br>
<br>
'''UP''' Unknown Precipitation<br>
<br>
'''UPDFTS''' Up Drafts<br>
<br>
'''UPDT''' Update<br>
<br>
'''UPR''' Upper<br>
<br>
'''UPSLP''' Upslope<br>
<br>
'''UPSTRM''' Upstream<br>
<br>
'''UQOT''' Unquote<br>
<br>
'''URAUZ''' You are authorized<br>
<br>
'''URG''' Urgent<br>
<br>
'''URIZR''' Your recommendation is requested<br>
<br>
'''U/S''' Unserviceable<br>
<br>
'''USA''' U.S. Army<br>
<br>
'''USAF''' U.S. Air Force<br>
<br>
'''USAFIB''' U.S. Army Aviation Flight Information<br>
<br>
'''USBL''' Usable<br>
<br>
'''USCG''' U.S. Coast Guard<br>
<br>
'''USMC''' U.S. Marine Corps<br>
<br>
'''USN''' U.S. Navy<br>
<br>
'''USNO''' United States Naval Observatory<br>
<br>
'''USNOF''' United States NOTAM Office<br>
<br>
'''USNS''' United States NOTAM System<br>
<br>
'''USP''' Urgent Special Observation (weather reports only)<br>
<br>
'''UTA''' Upper control area<br>
<br>
'''UTC''' Coordinated Universal Time<br>
<br>
'''UTCOK''' Coordinated Universal Time Coordinate Check Completed<br>
<br>
'''UUA''' Urgent PIREP<br>
<br>
'''UVV''' Upward Vertical Velocity<br>
<br>
'''UW''' Upwind<br>
<br>
'''UWNDS''' Upper Winds<br>
<br>
</div>
 
== V ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''V''' Variable (weather reports only)<br>
<br>
'''VA''' Victor Airways<br>
<br>
'''VA''' Volcanic Ash<br>
<br>
'''VAC''' Visual Approach Chart<br>
<br>
'''VACAPES''' Virginia Capes<br>
<br>
'''VADA''' VFR Arrival Delay Advisory<br>
<br>
'''VAL''' Valleys<br>
<br>
'''VAN''' Runway control van<br>
<br>
'''VAPS''' V/STOL Approach System<br>
<br>
'''VAR''' Magnetic Variation<br>
<br>
'''VAR''' Visual Aural Radio Range<br>
<br>
'''VARN''' Variation<br>
<br>
'''VASI''' Visual Approach Slope Indicator<br>
<br>
'''VASIS''' Visual Approach Slope Indicator System<br>
<br>
'''VC''' Vicinity<br>
<br>
'''VCFG''' Fog in Vicinity<br>
<br>
'''VCNTY''' Vicinity<br>
<br>
'''VCOT''' VFR Conditions On Top<br>
<br>
'''VCTR''' Vector<br>
<br>
'''VDF''' Very High Frequency Direction Finding Station<br>
<br>
'''VDOP''' Vertical Dilution of Precision<br>
<br>
'''VDP''' Visual Descent Point<br>
<br>
'''VER''' Vertical<br>
<br>
'''VF''' Maintaining Visual Flight<br>
<br>
'''VFLT''' Visual Flight<br>
<br>
'''VFPR''' Via Flight Planned Route<br>
<br>
'''VFR''' Visual Flight Rules<br>
<br>
'''VFRSA''' VFR Restrictions Still Apply<br>
<br>
'''VFY''' Verify<br>
<br>
'''VHF''' Very High Frequency<br>
<br>
'''VIA''' By way of<br>
<br>
'''VIP''' Very Important Person<br>
<br>
'''VIP''' Visual Integrated Presentation<br>
<br>
'''VIS''' Visibility<br>
<br>
'''VLCTY''' Velocity<br>
<br>
'''VLF''' Very Low Frequency<br>
<br>
'''VLFD''' Via Low Frequency Direct<br>
<br>
'''VLNT''' Violent<br>
<br>
'''VLR''' Very Long Range<br>
<br>
'''VLY''' Valley<br>
<br>
'''VM''' Voice Modulation<br>
<br>
'''VMC''' Visual Meteorological Conditions<br>
<br>
'''VNAV''' Vertical Navigation<br>
<br>
'''VOD''' Via Omni Direct<br>
<br>
'''VOL''' Volume<br>
<br>
'''VOLMET''' Meteorological information for aircraft in flight<br>
<br>
'''VOPR''' Voice Operated Relay<br>
<br>
'''VOR''' Very High Frequency Omnidirectional Range<br>
<br>
'''VOR''' APPR VOR Approach<br>
<br>
'''VOR/DME''' Very High Frequency Omnidirectional Range Collocated with Distance Measuring Equipment<br>
<br>
'''VOR/DME''' VHF Omnidirectional Range/Distance Measuring Equipment<br>
<br>
'''VOR/DME''' VOR and DME (collocated)<br>
<br>
'''VOROC''' VOR On Course<br>
<br>
'''VORTAC''' Very High Frequency Omnidirectional Range Collocated Tactical Air<br>
<br>
'''VORTAC''' VOR and TACAN (collocated)<br>
<br>
'''VORTAC''' VOR collocated with TACAN<br>
<br>
'''VOT''' VOR airborne equipment test facility<br>
<br>
'''VOT''' VOR Test Facility<br>
<br>
'''VOT''' VOR Test signal<br>
<br>
'''VOT''' Vorticity<br>
<br>
'''VOU''' Voucher<br>
<br>
'''VR''' Veer<br>
<br>
'''VR''' VFR military training routes<br>
<br>
'''VRB''' Variable<br>
<br>
'''VRBL''' Variable<br>
<br>
'''VRG''' Visual Reference Gate<br>
<br>
'''VRISL''' Vancouver Island, BC<br>
<br>
'''VRT''' MOTN Vertical Motion<br>
<br>
'''VSA''' By visual reference to the ground<br>
<br>
'''VSB''' Visible<br>
<br>
'''VSBY''' Visibility<br>
<br>
'''VSBYDR''' Visibility Decreasing Rapidly<br>
<br>
'''VSBYIR''' Visibility Increasing Rapidly<br>
<br>
'''VSL''' Vessel<br>
<br>
'''VSP''' Vertical Speed<br>
<br>
'''VSPI''' Visual Glide path Indicator<br>
<br>
'''VSTOL''' Vertical/Short Takeoff and Landing<br>
<br>
'''VTOL''' Vertical Takeoff and Landing<br>
<br>
'''VV''' Vertical Visibility (indefinite ceiling)<br>
<br>
</div>
 
== W ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''W''' Warm (air mass)<br>
<br>
'''W''' West or western longitude<br>
<br>
'''W''' White<br>
<br>
'''WA''' AIRMET<br>
<br>
'''WAAS''' Wide Area Augmentation System<br>
<br>
'''WAC''' World Aeronautical Chart<br>
<br>
'''WAFC''' World Area Forecast Center<br>
<br>
'''WAIOP''' Will Accept If Offered the Position<br>
<br>
'''WB''' Westbound<br>
<br>
'''WBAR''' Wing Bar Lights<br>
<br>
'''WBND''' Westbound<br>
<br>
'''WBRBN''' Will Be Reported by NOTAM<br>
<br>
'''WBRH''' Weather Bureau Regional Headquarters<br>
<br>
'''WBTS''' Whereabouts<br>
<br>
'''WCLC''' Watch Check List Completed<br>
<br>
'''WDC1''' World Data Centers in Western Europe<br>
<br>
'''WDC2''' World Data Centers throughout rest of world<br>
<br>
'''WDI''' Wind Direction Indicator<br>
<br>
'''WDLY''' Widely<br>
<br>
'''WDSPR''' Widespread<br>
<br>
'''WDSPRD''' Widespread<br>
<br>
'''WEA''' Weather<br>
<br>
'''WEF''' With Effect From<br>
<br>
'''WFO''' Weather Forecast Office<br>
<br>
'''WFP''' Warm Front Passage<br>
<br>
'''WG''' Working Group<br>
<br>
'''WGS''' World Geodetic System<br>
<br>
'''WGS84''' World Geodetic System 1984<br>
<br>
'''WI''' Within<br>
<br>
'''WIBIS''' Will Be Issued<br>
<br>
'''WICA''' While in Control Area<br>
<br>
'''WICZ''' While in Control Zone<br>
<br>
'''WID''' Width<br>
<br>
'''WIE''' With Immediate Effect<br>
<br>
'''WILCO''' Will Comply<br>
<br>
'''WINT''' Winter<br>
<br>
'''WINTEM''' Forecast upper wind and temperature for aviation<br>
<br>
'''WIP''' Work In Progress<br>
<br>
'''WK''' Weak<br>
<br>
'''WKDAY''' Weekday<br>
<br>
'''WKEND''' Weekend<br>
<br>
'''WKN''' Weaken<br>
<br>
'''WL''' Will<br>
<br>
'''WLAV''' Will Advise<br>
<br>
'''WMO''' World Meteorological Organization<br>
<br>
'''WMSC''' Weather Message Switching Center<br>
<br>
'''WND''' Wind<br>
<br>
'''WNW''' West North West<br>
<br>
'''WNWRN''' West North Western<br>
<br>
'''WNWWD''' West North Westward<br>
<br>
'''WO''' Washington Office<br>
<br>
'''WO''' Without<br>
<br>
'''WP''' Waypoint<br>
<br>
'''WPLTO''' Western Plateau<br>
<br>
'''WPM''' Words Per Minute<br>
<br>
'''WPRT''' Waypoint Report<br>
<br>
'''WPT''' Waypoint<br>
<br>
'''WR''' Wet Runway<br>
<br>
'''WRC''' Well to Right of Course<br>
<br>
'''WRM''' Warm<br>
<br>
'''WRMFNT''' Warm Front<br>
<br>
'''WRNG''' Warning<br>
<br>
'''WRS''' Worse<br>
<br>
'''WS''' SIGMET<br>
<br>
'''WS''' Weak Signals<br>
<br>
'''WS''' Wind Shear<br>
<br>
'''WSCMO''' Weather Service Contract Meteorological Observatory<br>
<br>
'''WSHFT''' Wind Shift<br>
<br>
'''WSO''' Weather Service Office<br>
<br>
'''WSOM''' Weather Service Operations Manual<br>
<br>
'''WSP''' Weather System Processor (replacement for LLWAS)<br>
<br>
'''WSR''' Wet Snow on Runway<br>
<br>
'''WSSF''' National Weather Service Support Facility<br>
<br>
'''WSSU''' National Weather Service Support Unit<br>
<br>
'''WSTCH''' Wash Range<br>
<br>
'''WSW''' West South west<br>
<br>
'''WSWRN''' West South Western<br>
<br>
'''WSWWD''' West South Westward<br>
<br>
'''WT''' Weight<br>
<br>
'''WTR''' Water<br>
<br>
'''WTR''' Well To Right<br>
<br>
'''WTSPT''' Waterspout<br>
<br>
'''WU''' Western Union Telegraph Company<br>
<br>
'''WV''' Wave<br>
<br>
'''WV''' Wind at altitude (PIREP only)<br>
<br>
'''WW''' Severe weather forecast<br>
<br>
'''WWW''' World Wide Web<br>
<br>
'''WX''' Weather<br>
<br>
'''WX''' Weather at altitude (PIREP only)<br>
<br>
'''WXCON''' Weather reconnaissance flight pilot report<br>
<br>
'''WYAIO''' Will You Accept if Offered the Position of<br>
<br>
</div>
 
== X ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''X''' Cross<br>
<br>
'''X''' Obscured sky condition<br>
<br>
'''XBAR''' Crossbar<br>
<br>
'''XCP''' Except<br>
<br>
'''XFSS''' Auxiliary Flight Service Station<br>
<br>
'''XH''' Special handling service for aircraft<br>
<br>
'''XNG''' Crossing<br>
<br>
'''XPC''' Expect<br>
<br>
'''XPLOS''' Explosive<br>
<br>
'''XREP''' Auxiliary Report<br>
<br>
'''XS''' Atmospherics<br>
<br>
'''XTAL''' Crystal<br>
<br>
'''XTLK''' Cross Talk<br>
<br>
'''XW''' Crosswind<br>
<br>
'''XX''' Heavy (to qualify weather phenomena, e.g. XXRA heavy rain)<br>
<br>
</div>
 
== Y ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''Y''' Yukon Standard Time (time groups only)<br>
<br>
'''YCZ''' Yellow Caution Zone (runway lighting)<br>
<br>
'''YD''' Yards<br>
<br>
'''YDA''' Yesterday<br>
<br>
'''YES''' Yes (affirmative)<br>
<br>
'''YKN''' Yukon<br>
<br>
'''YL''' Approach light lane<br>
<br>
'''YLSTN''' Yellowstone<br>
<br>
'''YMSG''' Your Message<br>
<br>
'''YMSGD''' Your Message Date<br>
<br>
'''YR''' Your<br>
<br>
</div>
 
== Z ==
<div style="column-count:4; column-gap:20px; width:800px; max-width:100%; font-family:Arial, sans-serif; line-height:1.4;">
'''Z''' Greenwich Mean Time<br>
<br>
'''Z''' Jet terminal area<br>
<br>
'''ZI''' Zonal Index<br>
<br>
'''ZI''' Zone of Interior<br>
<br>
'''ZM''' Z marker (VHF station location marker)<br>
<br>
'''ZRNO''' Freezing Rain Information Not Available<br>
<br>
</div>
 
Acronym information sourced from [https://proairpilot.com/faa-notams.html ProAirPilot].
 
</td>
 
<td style="
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</td>
 
</tr>
</table>

Latest revision as of 06:59, 31 August 2026


Date Subject Linked Article Author(s) Institution Ind.
2026
31 Aug. 2026 Artificial Intelligence Erosion of the Human Safety Margin Clark, Albert N. ASX Research Journal and Database

30 Aug. 2026 Artificial Intelligence The Autonomous Flight Deck Clark, Albert N. ASX Research Journal and Database

29 Aug. 2026 Artificial Intelligence AI as an Aviation Safety Decision Maker Clark, Albert N. ASX Research Journal and Database
26 Aug. 2026 Artificial Intelligence AI Certification for the NAS Clark, Albert N. ASX Research Journal and Database

2025
27 June 2025 Flight Safety The Potomac River Air Tragedy: Inside the Special Flight Rules Area (SFRA) Failure Clark, Albert N. Everglades University, ASX Research Journal and Database

17 June 2025 Flight Safety Balancing Automation and Human Expertise: A Comprehensive Approach to the Future of Air Safety Clark, Albert N. Everglades University, ASX Research Journal and Database

27 April 2025 Flight Simulation Next-Gen Flight Education: MSFS and the Future of Simulation-Based Pilot Training Clark, Albert N. Everglades University, ASX Research Journal and Database
01 March 2025 Global Supply Chain Logistics Global Supply Chain Logistics: Strategies, Challenges, and the Future of International Trade Clark, Albert N. Everglades University, ASX Research Journal and Database

2024
08 Dec. 2024 Aircraft Systems From Levers to Glass: The Evolution of Aircraft Cockpits and the Future of Aviation Innovation Clark, Albert N. Everglades University, ASX Research Journal and Database

25 Aug. 2024 Navigation Systems ADS-B: Advancements in Air Traffic Management Clark, Albert N. Everglades University, ASX Research Journal and Database
23 June 2024 UAVs The Advent and Use of Drones in Public Use Airspace Clark, Albert N. Everglades University, ASX Research Journal and Database
02 June 2024 World History The Impact of World War II and the Establishment of Israel Clark, Albert N. Everglades University, ASX Research Journal and Database
2023
17 Dec. 2023 Flight Safety - Airport Advancements in Airport Lighting: Illuminating the Path of Modern Aviation Clark, Albert N. Everglades University, ASX Research Journal and Database
12 Nov. 2023 Emergency Management Challenges Facing Emergency Management in the Future Clark, Albert N. Everglades University, ASX Research Journal and Database

22 Oct. 2023 Emergency Management Overcoming Communication and Coordination Challenges: Vital Considerations for Response and Recovery Clark, Albert N. Everglades University, ASX Research Journal and Database
2021
15 June 2021 Space Travel One Giant Sale for Mankind: Armstrong’s Moon Mission Companions Auctioned Clark, Albert N. The Aviationist, ASX Research Journal and Database

21 May 2021 Meteorology NOAA Hurricane Hunters Clark, Albert N. The Aviationist, ASX Research Journal and Database
2018
01 Nov. 2018 Flight Safety - Aircrew The Impossible Turn FAA Safety Team FAA


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