Abbr,Term A/A,Air to air TACAN function A/C,Aircraft A/D,Aerodrome A/F,Autofeather A/FD,Airport/Facility Directory A/P,Autopilot A/R,Altitude Rate AAA,Airport Airspace Analysis AAE,Above Aerodrome Elevation AAF,Airway Facilities Service AAF,Army Air Field AAI,Arrival Aircraft Interval AAI,Airports Authority of India AAIB,Air Accidents Investigation Branch (UK) AAIM,Aircraft Autonomous Integrity Monitoring AAMS,Aircraft Arrival Management System AARTS,Army Aviation Radar Training System AAO,Assumed Adverse Obstacle AAS,Airport Advisory Service AB,Air Base ABI,Advanced Boundary Information AC,Air Conditioning AC,Aircraft ACAC,Arab Civil Aviation Conference ACAM,Aircraft Continuing Airworthiness Monitoring ACARS,Aircraft Communications Addressing and Reporting System ACAS,Airborne Collision Avoidance System ACC,Area Control Center ACE,Airport airside Capacity Enhancement ACI,Airports Council International ACP,Accept AD,Air Defence ADAC,Abu Dhabi Airports ADEP,Aerodrome of Departure ADES,Aerodrome of Destination ADF,Automatic Direction Finding ADI,Automatic De-Ice and Inhibitor ADIZ,Air Defense Identification Zone ADL,Aeronautical Data Link ADLY,Arrival Delay ADP,Aerodrome dé Paris (Charles de Gaulle) ADP,Automated Data Processing ADS,Automated Distribution System ADS,Automatic Dependent Surveillance ADS-B,Automatic Dependent Surveillance-Broadcast AENA,Aeropuertos Españoles y Navegación Aérea AERA,Automated En-Route Air Traffic Control AEW,Airborne Early Warning AF,Air Field AFCS,Automatic Flight Control System AFIS,Aerodrome Flight Information Service AFTN,Aeronautical Fixed Telecommunication Network AFM,Aircraft Flight Manual AGAS,Action Group for ATM Safety (EUROCONTROL) AGL,Above Ground Level ahdg,alter heading AICS,Aircraft Inventory and Charter System AID,Airport Information Desk AIDS,Aircraft Integrated Data System AIG,Airbus Industries Group AILS,Automatic Instrument Landing System AIM,Aeronautical Information Manual AIP,Aeronautical Information Publication AIPA,Aeronautical Information Production Application AIRAC,Aeronautical Information Regulation And Control AIRMET,Airmen's Meteorological Information AIRNAV,Airports and Navigation Aids Database System AIRNET,Airport Network Simulation Model AIRPAC,Advisor for the Intelligent Resolution of Predicted Aircraft ALO,Aviation Logistics Organization ALP,Airport Layout Plan ALPA,Airlines Pilots Association ALS,Approach Lighting System ALSF,Approach Lighting System With Sequenced Flashing Lights ALSF1,ALS with Sequenced Flashers I ALSF2,ALS with Sequenced Flashers II ALSIP,Approach Lighting System Improvement Plan ALTRV,Altitude Reservation AMAN,Arrival Manager AMASS,Airport Movement Area Safety System AMCC,Air Route Traffic Control Center Maintenance Control Center AMIC,Area Manager in Charge AMIS,Aircraft Management Information System AMOC,Alternative Methods of Compliance AMOS,Automated Meteorological Observation Station AMP,ARINC Message Processor (OR) Airport Master Plan AMS,Acquisition Management System AMT,Aviation Maintenance Technician AMVER,Automated Mutual Assistance Vessel Rescue System ANC,Alternate Network Connectivity ANCA,Airport Noise and Capacity Act ANG,Air National Guard ANGB,Air National Guard Base ANMS,Automated Network Monitoring System ANSP,Air Navigation Service Provider AOA,Air Operations Area AOA,Angle of Attack AOC,Airline Operational Control Center AOCC,Atlantic Operations Control Center AODR,Authorizing Official Designated Representative AOM,Airplane Operating Manual AOPA,Aircraft Owners and Pilots Association AOR,Area of Responsibility AP,Acquisition Plan APB,Acquisition Program Baselines APM,Approach Path Monitor APP,Approach APS,Airport Planning Standard APTS,Automated Personnel Tracking System AQAFO,Aeronautical Quality Assurance Field Office AR,Aerial Refueling AR,Aspect Ratio ARAC,Army Radar Approach Control (AAF) ARFOR,Area Forecast ARINC,Aeronautical Radio, Inc. (USA) ARLNO,Airline Office ARP,Airport Reference Point ARTCC,Air Route Traffic Control Centre ASB,Airspace Block ASDE,Airport Surface Detection Equipment ASDE-X,"Airport Surface Detection Equipment, model X" ATA,Actual Time of Arrival ATC,Air Traffic Control ATIS,Automatic Terminal Information Service ATO,Air Traffic Organization AWACS,Airborne Warning And Control System BC,Back Course BAF,Belgian Air Force BIRTAM,NOTAM on Bird Activity BIT,Build-In Test BITE,Build-In Test Equipment BRNAV,Basic Area Navigation BWI,Baltimore/Washington International Thurgood Marshall Airport C2,Command and Control C3,"Communication, Command and Control" C4I,"Communication, Command, Control, Computers and Intelligence" CAAC,Civil Aviation Administration of China CAAS,Civil Aviation Authorization of Singapore CAL,Computer Assisted Learning CAMACA,Common Agreed Methodology for Airport airside Capacity Assessment CANAC,Computer Assisted National Air Traffic Control Centre (Belgium) CANSO,Civil Air Navigation Services Organization CARMA,CATC Radar Simulator Allahabad CAS,Calibrated Airspeed CASE,Controlled Airspace Synthetic Environment (Simulator of Alenia Marconi) CAT,Category of Aircraft CATC,Civil Air Traffic Control CAVOK,Clouds And Visibility OK CBT,Computer-based Training CCBC,Community College Baltimore County CCIS,Closed Circuit Information System CDA,Continuous Descent Approach CDI,Course Deviation Indicator CDM,Collaborative Decision Making CDTI,Cockpit Display of Traffic Information CDU,Cockpit Display Unit CEATS,Central European Air Traffic Services CESC,Chief Executive Standing Conference CFIT,Controlled Flight Into Terrain CFMU,Central Flow Management Unit COG,Center of Gravity CON,Control CGD,Combined Graphic Display CISM,Critical Incident Stress Management CLC,Course Line Computer CLNC,Clearance CRDA,Converging Runway Display Aid CMIC,Civil/Military Interface Standing Committee CNS,"Communication, Navigation, Surveillance" CODA,Central Office for Delay Analysis ConOps,Concept of Operations COPS,Changeover Point(s) CORA,Conflict Resolution Advisory COTS,Commercial Of-The-Shelf CPA,Closest Point of Approach CPDLC,Controller Pilot Data Link Communication CRC,Control and Reporting Centre CREDOS,Crosswind Reduced Separations for Departure Operations CTA,Controlled Area CTA,Controlled Time of Arrival CTOT,Calculated Take-Off Time CTR,Control Zone or Controlled Traffic Region CVFR,Controlled Visual Flight Rule (flight) CVSM,Conventional Vertical Separation Minimum CW,Continous Wave CW,Cold Weather CWS,Collision Warning System CWP,Controller Working Position DAS,DFS Aviation Services (DFS subcompany for services outside Germany) DCIA,Dependent Converging Instrument Approach DEL,Delivery DFS,Deutsche Flugsicherung (ATC in Germany) DGAC,Direction générale de l'aviation civile DTI,Direction Technique Innovation DW,Downwind EAS,Equivalent Airspeed EAVA,Estonian Aviation Academy ECAC,European Civil Aviation Conference ELEV,Field Elevation EFM,Gesellschaft für Enteisen und Flugzeugschleppen ETA,Estimated Time of Arrival ETOPS,Extended-range Twin-engine Operational Performance Standards ETVS,Electronic Terminal Voice Switch FAA,U.S. Federal Aviation Administration FAR,Fuel Air Ratio FAS,Final Approach Segment FAS,Final Approach Speed FAST,Future Aviation Safety Team FAT,Factory Acceptance Test (see also SAT and RAT) FAT,Final Approach Track FATO,Final Approach and Take-off Area FAWP,Final Approach Waypoint FAWS,Flight Advisory Weather Service FBW,Fly-by-Wire FCA,Final Cruise Altitude FCC,Federal Communications Commission (USA) FCC,Flight Control Computer FCI,Flight Command Indicator FCL,Flight Crew Licensing FCLP,Field Carrier Landing Practice FCLT,Freeze Calculated Landing Time FCLTP,Flight Crew Licensing and Training Panel (ICAO) FCOM,Flight Crew Operating Manual FCOM,Flight Crew Operations Manual FCPC,Flight Control Primary Computer FE,Field Elevation (highest point of an airport’s usable runways and is measured in height above mean sea level) FIA,Flight Information Area FIR,Flight Information Region FL,Flight Level FMG,Flughafen München GmbH FOD,Foreign Object Debris FOV,Field of View GND,Ground GP,Glide Path GPS,Global Positioning System GS,Ground Speed or Glideslope HKIA,Hong Kong International Airport IAA,Israeli Airport Authority IAF,Israeli Air Force IANS,Institute of Air Navigation Services, a division of Eurocontrol IAS,Indicated Air Speed IATA,International Air Transport Association, HQ in Montreal, Canada IFR,Instrument Flight Rules IG,Image Generator IGLR,Integrated Ground Lighting and Radar ILS,Instrument Landing System IMC,Instrument Meteorological Conditions KAT,Kaufbeuren ATM Training (DFS subcompany) LAA,Lappland Aviation Academy LITAS,Low Intensity Two Colour Approach System LL,Lower Limit LMUK,Lockheed Martin UK LOD,Level of Detail LTA,Lower Traffic Area LVNL,Luchtverkeersleiding Nederland (Air Traffic Control the Netherlands) LVP,Low Visibility Procedures MATS,Malta Air Traffic Services MEA,Minimum En-route Altitude METAR,Meteorological Aerodrome Report MLW,Maximum Landing Weight MSL,Median Sea Level MSTA,Minimum Safe Turning Altitude MTOW,Maximum Take-Off Weight OCTA,Outside Control Areas OFZ,Obstacle Free Zone OJT,On the Job Training PAPI,Precision Approach Path Indicator PAR,Precision Approach Radar PIC,Pilot in Command PNF,Pilot Not Flying POH,Pilot's Operating Handbook PPL,Private Pilot's License PTAC,"Position, Turn, Altitude, Clearance (also known as Approach Clearance)" PtF,Permit to Fly QFE,"the altimeter setting that will cause the altimeter to read the height above a specific aerodrome or ground level, and therefore read zero on landing" QNE,pressure altitude at the landing runway threshold QNH,atmospheric pressure adjusted to mean sea level RADAR,Radio Detection And Ranging RADNET,Radar Network RAIM,Receiver Autonomous Integrity Monitoring (GPS) RAT,Reliability Acceptance Test (see also FAT and SAT) RAM,Radar Absorbent Material RAP,Recognised Air Picture RASP,Recognised Air and Surveillance Picture RB,Relative Bearing RBI,Relative Bearing Indicator RBAF,Royal Belgium Armed Forces RCAF,Royal Canadian Air Force RCC,Rescue Co-ordination Centre RCL,Runway Centre Line Lighting RCS,Radar Cross Section RET,Rapid Exit Taxiways RF,Radio Frequency RFFS,Rescue and Fire Fighting Services RIMCAS,Runway Incursion Monitoring and Conflict Alert System RJAF,Royal Jordanian Air Force RJC,Reject RPI,Runway Point of Intercept RPM,Rotations per Minute RMI,Radio Magnetic Indicator RNAV,Area Navigation RNP,Required Navigation Performance ROC,Rate Of Climb ROC,Required Obstacle Clearance RPM,Revolutions Per Minute RPS,Radar Position Symbol RTCA,Radio Technical Commission for Aeronautics RVR,Runway Visual Range RVSM,Reduced Vertical Separation Minimum RWR,Radar Warning Receiver RWY,Runway SADL,Situational Awareness Data Link SAR,Search and Rescue SAR,Synthetic Aperture Radar SARPS,Standards and Recommended Practices (ICAO) SAT,Site Acceptance Test (see also FAT and RAT) SATCO,Senior Air Traffic Control Officer SATCOM,Satellite Communication SATNAV,Satellite Navigation SATSE,State Air Traffic Services Enterprise SDD,Situation Data Display SELCAL,Selective Calling System SES,Single European Sky SESAME,Single European Sky ATM Master Plan SFL,Sequencing Flashing Light SFO,Simulated Flameout Operation SI,Selective Interrogation SIAP,Standard Instrument Approach Procedure SID,Standard Instrument Departure SIF,Selective Identification Friend or Foe SIGMET,Significant Meteorological (Information) Report SILs,Sector Inbound Lists SIM,Simulator SKYGUIDE,Swiss Air Traffic Control SLB,Side lobe Blanking SLC,Side lobe Cancellation SLOC,Slovenia Control SM,Statute Mile SMR,Surface Movement Radar SOW,Statement of Work SRC,Safety Regulation Commission (EUROCONTROL) SRU,Safety Regulation Unit (EUROCONTROL) SSR,Secondary Surveillance Radar STAR,Standard Arrival Route or Standard Terminal Arrival Route STARS,Standard Terminal Automation Replacement System STB,Stop Bar STCA,Short Term Conflict Alert STD,Synthetic Training Device STDMA,Self-organising Time Division Multiple Access (known as VHF digital link - Mode 4) STNA,Service Technique de la Navigation Aerienne STOL,Short Take Off and Landing STRATFOR,Eurocontrol Statistics and Forecasts Service SUA,Special Use Airspace SV,Supervisor SVFR,Special Visual Flight Rules SWT,Switch SYSCO,System Coordination – Data Exchange and Coordination TA,Terminal Airspace TAA,Terminal Arrival Area TAAM,Total Airspace and Airport Modeller TACAN,Tactical Air Navigation (System) TACS,Theater Air Control System TACTICOS,Tactical Information and Command System TAF,Terminal Aerodrome/Area Forecast TAIS,Tactical Airspace Integration System (US Army) TAIS,Tactical Air Intelligence System TAP,Target Acquisition Protocol TARMAC,Taxi and Ramp Management and Control TAS,Terminal Airspace System TAS,True Airspeed TAWS,Terrain Awareness and Warning System TCAS,Traffic alert and Collision Avoidance System TCDS,Type Certificate Data Sheet TCH,Threshold Crossing Height TCL,Taxi Center Lights TDW,Tower Display Workstation TDZ,Runway Touchdown Zone Lighting TDZE,Touch Down Zone Elevation TERPS,US Standard for Terminal Instrument Procedures TFDM,Terminal Flight Data Management TFDPS,Tower Flight Data Processing System TFM,Traffic Flow Management TFR,Temporary Flight Restriction TH,True Heading TID,Touch Input Device TIGPRO,TOWSIM Image Generator Protocol TIS,Traffic Information System TM,Traffic Management TMA,Terminal Control Area TOC,Top Of Climb TOD,Top Of Descent TOR,Terms Of Reference TOR,Tornado aircraft TOWSIM,Tower Simulator TRACON,Terminal Radar Approach Control TSO,Technical Standard Order TSTC,Texas State Technical College TT,True Track TVOR,Terminal VOR TWEB,Transcribed Weather Broadcast (USA for ATIS) TWR,Control Tower TWY,Taxiway TXC,Taxiway Centreline Lights TXE,Taxiway Edge Lights UAA,University of Alaska Anchorage UAC,Upper Area Control Centre UAT,Universal Access Transceiver UAV,Unmanned Aerial Vehicle UDF,Ultra High Frequency Direction Finding UEI,"Units, Equipment, Installations" UHF,Ultra High Frequency UIR,Upper Flight Information Region UKCAA,United Kingdom Civil Aviation Authority UMASS,University of Massachusetts URET,User Request Evaluation Tool USAF,US Air Force UTA,Upper Traffic Area V1,Decision speed, the speed beyond which takeoff should no longer be aborted V2,Takeoff speed. The speed at which the aircraft may safely be climbed with one engine inoperative VAR,Magnetic Variation VASI,Visual Approach Slope Indicator VASIS,Visual Approach Slope Indicator System VCS,Voice Communication System VCCS,Voice Communication Control System VDF,Very High Frequency Direction Finding VDGS,Visual Database Generation System VDL-4,VHF digital link Mode 4 (see also STDMA) VDU,Visual Display Unit VFOW,Vertical Field of View VFR,Visual Flight Rules VHF,Very High Frequency VLF,Very Low Frequency VMC,Visual Meteorological Conditions VMO,maximum operation speed is the air speed than should never be exceeded deliberately in normal operation, whatever the flight situation isVOR,VHF Omni-directional Range VOLMET,Meteorological Information for Aircraft in Flight VOR,VHF Omni-directional Radio Range VORTAC,VOR -TACAN combination VREF,1.3 times the stalling speed of the aircraft in the stated landing configuration and at the prevailing aircraft weight VRR,Voice Recognition and Response VRS,Voice Recognition System VS,"Stall speed, defined as the minimum steady flight speed at which the airplane is controllable" VSBY,Visibility VSP,Vertical Speed VSTOL,Vertical Short Take-Off and Landing VTC,Visual Terminal Chart VTC,Virtual Training Centre VTOL,Vertical Take-Off and Landing VTOSL,Vertical Take-Off and Short Landing VTS,Vehicle Tracking System WA,Wind Angle WAAS,Wide Area Augmentation System WAM,Wide Area Multilateration WBS,Work Break-down Structure WCA,Wind Correction Angle WDI,Wind Direction Indicator WGS,World Geodetic System WIAS,Wetter Informations- und Anzeigesystem (German) WP,Waypoint WS,Work Station WTC,Wake Turbulence Category WTWS,Wake Turbulence Warning System WX,Weather