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Definitions

1,345 terms
1 group (METAR remarks) METAR Remarks 6-Hour Maximum Temperature The 1 group reports the 6-hour maximum temperature in tenths of a degree Celsius.
2 group (METAR remarks) METAR Remarks 6-Hour Minimum Temperature The 2 group reports the 6-hour minimum temperature in tenths of a degree Celsius.
5 group (METAR remarks) METAR Remarks 3-Hour Pressure Tendency The 5 group reports the pressure tendency over the past 3 hours.
6 group (METAR remarks) METAR Remarks 3/6-Hour Precipitation Amount The 6 group reports 3- and 6-hour precipitation amount.
7 group (METAR remarks) METAR Remarks 24-Hour Precipitation Amount The 7 group reports 24-hour precipitation amount.
A TOMATO FLAMES vs. GOOSE A CAT Mnemonics Equipment Mnemonic Variants Different instructors teach different mnemonics for the same rule. ATOMATOFLAMES and A TOMATO FLAMES are the same list; GOOSE A CAT is…
AAM Airspace ADVANCED AIR MOBILITY (AAM) A transportation system that transports people and property by air between two points in the NAS using aircraft with advanced technologies, including…
AAR Airspace AIRPORT ARRIVAL RATE (AAR) A dynamic input parameter specifying the number of arriving aircraft which an airport or airspace can accept from the ARTCC per hour.…
ABRR ATC & Communications AIRBORNE REROUTE (ABRR) A capability within the Traffic Flow Management System used for the timely development and implementation of tactical reroutes for airborne aircraft. This…
AC Flight Planning ADVISORY CIRCULAR (AC) An FAA publication, advisory and descriptive in nature, which is not regulatory. Listed in the Pilot/Controller Glossary as a cross-reference to ADVISORY…
ACC [ICAO] General Aviation See ICAO term AREA CONTROL CENTER.
ACCELERATE‐STOP DISTANCE AVAILABLE Airport Operations The runway plus stopway length declared available and suitable for the acceleration and deceleration of an airplane aborting a takeoff.
ACCELERATE‐STOP DISTANCE AVAILABLE [ICAO] General Aviation The length of the take‐off run available plus the length of the stopway if provided.
ACDO General Aviation An FAA field office serving an assigned geographical area, staffed with Flight Standards personnel serving the aviation industry and the general public…
ACKNOWLEDGE ATC & Communications Let me know that you have received and understood this message.
ACL Airspace AIRCRAFT LIST (ACL) A view available with EDST that lists aircraft currently in or predicted to be in a particular sector's airspace. The view contains…
ACLS Instrument Procedures U.S. Navy final approach equipment consisting of precision tracking radar coupled to a computer data link to provide continuous information to the…
ACROBATIC FLIGHT General Aviation An intentional maneuver involving an abrupt change in an aircraft's attitude, an abnormal attitude, or abnormal acceleration not necessary for normal flight.
ACROBATIC FLIGHT [ICAO] General Aviation Maneuvers intentionally performed by an aircraft involving an abrupt change in its attitude, an abnormal attitude, or an abnormal variation in speed.
ACTIVE RUNWAY Instrument Procedures Any runway or runways currently being used for takeoff or landing. When multiple runways are used, they are all considered active runways.…
ACTUAL NAVIGATION PERFORMANCE (ANP) Airspace ANP A statement of the navigational performance necessary for operation within a defined airspace. The following terms are commonly associated with RNP: Required…
ADAPTED ROUTES Instrument Procedures Departure and/or arrival routes that are adapted in ARTCC ERAM computers to accomplish inter/intrafacility controller coordination and to ensure that flight data…
ADAR Instrument Procedures Departure and/or arrival routes that are adapted in ARTCC ERAM computers to accomplish inter/intrafacility controller coordination and to ensure that flight data…
ADDITIONAL SERVICES Weather Services Advisory information provided by ATC which includes but is not limited to the following: Traffic advisories. Vectors, when requested by the pilot,…
ADF Navigation An aircraft radio navigation system which senses and indicates the direction to a L/MF nondirectional radio beacon (NDB) ground transmitter. Direction is…
ADIZ Airspace Air Defense Identification Zone An Air Defense Identification Zone — airspace within which the ready identification, location and control of aircraft is required in the interest…
ADLY Airport Operations A parameter which specifies a period of time in which no aircraft will be metered for arrival at the specified airport. Listed…
ADM Aeronautical Decision Making A systematic approach to the mental process used by pilots to consistently determine the best course of action in…
ADMINISTRATOR General Aviation The Federal Aviation Administrator or any person to whom he/she has delegated his/her authority in the matter concerned.
ADR Instrument Procedures Departure and/or arrival routes that are adapted in ARTCC ERAM computers to accomplish inter/intrafacility controller coordination and to ensure that flight data…
ADS [ICAO] General Aviation See ICAO term AUTOMATIC DEPENDENT SURVEILLANCE.
ADS-B Avionics Automatic Dependent Surveillance – Broadcast Automatic Dependent Surveillance – Broadcast. ADS-B Out broadcasts the aircraft’s GPS position, altitude and velocity; ADS-B In receives traffic (TIS-B) and weather…
ADS-C ATC & Communications AUTOMATIC DEPENDENT SURVEILLANCE-CONTRACT (ADS-C) A data link position reporting system, controlled by a ground station, that establishes contracts with an aircraft's avionics that occur automatically whenever…
ADVANCED AIR MOBILITY (AAM) Airspace AAM A transportation system that transports people and property by air between two points in the NAS using aircraft with advanced technologies, including…
ADVISE INTENTIONS General Aviation Tell me what you plan to do.
ADVISORY General Aviation Advice and information provided to assist pilots in the safe conduct of flight and aircraft movement.
ADVISORY CIRCULAR (AC) Flight Planning AC An FAA publication, advisory and descriptive in nature, which is not regulatory.
ADVISORY FREQUENCY ATC & Communications The appropriate frequency to be used for Airport Advisory Service.
ADVISORY SERVICE General Aviation Advice and information provided by a facility to assist pilots in the safe conduct of flight and aircraft movement.
ADW Instrument Procedures ARRIVAL/DEPARTURE WINDOW (ADW) A depiction presented on an air traffic control display, used by the controller to prevent possible conflicts between arrivals to, and departures…
AERIAL REFUELING Flight Planning A procedure used by the military to transfer fuel from one aircraft to another during flight.
AERODROME Aerodynamics & Performance A defined area on land or water (including any buildings, installations and equipment) intended to be used either wholly or in part…
AERODROME BEACON [ICAO] ATC & Communications Aeronautical beacon used to indicate the location of an aerodrome from the air.
AERODROME CONTROL SERVICE [ICAO] ATC & Communications Air traffic control service for aerodrome traffic.
AERODROME CONTROL TOWER [ICAO] ATC & Communications A unit established to provide air traffic control service to aerodrome traffic.
AERODROME ELEVATION [ICAO] Airport Operations The elevation of the highest point of the landing area.
AERODROME TRAFFIC CIRCUIT [ICAO] General Aviation The specified path to be flown by aircraft operating in the vicinity of an aerodrome.
AERONAUTICAL BEACON Navigation A visual NAVAID displaying flashes of white and/or colored light to indicate the location of an airport, a heliport, a landmark, a…
AERONAUTICAL CHART Airspace A map used in air navigation containing all or part of the following: topographic features, hazards and obstructions, navigation aids, navigation routes,…
AERONAUTICAL CHART [ICAO] Navigation A representation of a portion of the earth, its culture and relief, specifically designated to meet the requirements of air navigation.
Aeronautical Decision Making (ADM) Aeromedical ADM A systematic approach to the mental process used by pilots to consistently determine the best course of action in response to a…
AERONAUTICAL INFORMATION MANUAL (AIM) Airspace AIM A primary FAA publication whose purpose is to instruct airmen about operating in the National Airspace System of the U.S. It provides…
AERONAUTICAL INFORMATION PUBLICATION (AIP) [ICAO] Navigation A publication issued by or with the authority of a State and containing aeronautical information of a lasting character essential to air…
AERONAUTICAL INFORMATION SERVICES (AIS) General Aviation AIS A facility in Silver Spring, MD, established by FAA to operate a central aeronautical information service for the collection, validation, and dissemination…
AFFIRMATIVE General Aviation Yes.
AFIS General Aviation See AUTOMATIC FLIGHT INFORMATION SERVICE - ALASKA FSSs ONLY.
AFP Airspace AIRSPACE FLOW PROGRAM (AFP) AFP is a Traffic Management (TM) process administered by the Air Traffic Control System Command Center (ATCSCC) where aircraft are assigned an…
AGL General Aviation Above Ground Level Altitude expressed as height above ground level, rather than above sea level.
AHA ATC & Communications AIRCRAFT HAZARD AREA (AHA) Used by ATC to segregate air traffic from a launch vehicle, reentry vehicle, amateur rocket, jettisoned stages, hardware, or falling debris generated…
AIM Airspace AERONAUTICAL INFORMATION MANUAL (AIM) A primary FAA publication whose purpose is to instruct airmen about operating in the National Airspace System of the U.S. It provides…
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