Abbreviations and acronyms

A/AAir to air TACAN function
A/FDAirport/Facility Directory
AAEabove aerodrome elevation
AAIBAir Accidents Investigation Branch
AAIMAircraft Autonomous Integrity Monitoring
AAOassumed adverse obstacle
AASairport advisory service
ACadvisory circular
ACAMaircraft continuous airworthiness monitoring
ACARSAircraft Communication and Addressing Reporting System
ACASairborne collision avoidance system
ACCarea control centre
ACCactive clearance control
ACEActuator control electronics
ACIAirports Council International
ACLSautomatic carrier landing system
ACMair cycle machine
ACMSaircraft condition monitoring system
ACPAudio Control Panel
ACRAvionic Communication Router
ACS1Airman Certification Standards
ACS2Audio control system
ACU1air condition unit
ACU2alternator control unit
ADairworthiness directive
ADAadvisory area
ADAHRSair data attitude heading reference system
ADCair data computer
ADDacceptable deferred defect
ADFautomatic direction finder
ADIAttitude Director Indicator
ADIRSAir Data Inertial Reference System
ADIRUAir Data Inertial Reference Unit
ADIZAir Defense Identification Zone
ADM1aeronautical decision-making
ADM2air data module
ADNAircraft Data Network
ADS1air data system
ADS2automatic dependent surveillance
ADS-AAutomatic dependent surveillance – address
ADS-BAutomatic dependent surveillance – broadcast
ADS-CAutomatic dependent surveillance – contract
ADVArbeitsgemeinschaft Deutscher Verkehrsflughäfen
AEAAssociation of European Airlines
AESAActive electronically scanned array
AFCSautomatic flight control system
AFDautopilot flight director
AFDCautopilot flight director computer
AFDSautopilot flight director system
AFDXAvionics Full-Duplex Switched Ethernet
AFEabove field elevation
AFISairborne flight information system
AFMaircraft flight manual
AFSaeronautical fixed service
AFTAft The direction against the aircraft movement
AFTNAeronautical Fixed Telecommunication Network
AGACSAutomatic ground–air communications system
AGBaccessory gear box
AGCautomatic gain control
AGDLair–ground data link
AGLabove ground level
AHCattitude heading control
AHRSAttitude and heading reference system
AIDSaircraft integrated data system
AIMAeronautical Information Manual
AIPAeronautical Information Publication
AIRACaeronautical information regulation and control
AIRMETAirmen's Meteorological Advisory
AIXMaeronautical information exchange model
ALCAutomatic level control
ALIAirworthiness Limitation Item
ALNAAirline network architecture
ALSapproach lighting system
ALT holdAltitude hold mode
ALTSAltitude select
AMCAcceptable Means of Compliance (EASA)
AMEAircraft Maintenance Engineer
AMEAviation Medical Examiner
AMLCDActive-matrix liquid-crystal display
AMMAircraft Maintenance Manual
AMOApproved Maintenance Organization
AMSAir management system
AMSLabove mean sea level
AMPaircraft maintenance program
AMTAircraft Maintenance Technician
ANCActive noise cancellation
ANDAircraft Nose Down
ANNAnnunciator panel
ANPTAeronautical national pipe taper
ANRActive noise reduction
ANSP1air navigation service provider
ANSP2Authorization of Aircraft Network Security Program (FAA)
ANTAntenna (radio)
ANSOGAirport Network Security Operator Guidance (Boeing)
A/OAir oil
AOAangle of attack
AOC1air operator's certificate
AOC2Aeronautical operational control
AOGaircraft on ground
AOM1aircraft operations manual
AOM2airport/aerodrome operating minima
AOPAirport operating plan
A/Pairplane (US), aeroplane (ICAO)
APARSAutomatic pressure altitude reporting system
APCAuto pilot computer
APIRSAttitude and positioning inertial reference system
APOAAirport of arrival
APODAirport of departure
APMAircraft personality module
APSAuto pilot system
APUauxiliary power unit
APVapproach procedure with vertical guidance
AQPAdvanced Qualification Program
ARairworthiness review
ARauthorization required
ARas required
ARCairworthiness review certificate
ARINCAeronautical Radio Inc.
AROairport reservation office
ARPaerodrome reference point
ARTCCair route traffic control centers
ASASAirborne Separation Assurance System
ASDAircraft situation display
ASDAAccelerate Stop Distance Available
ASDLAeronautical satellite data link
ASIairspeed indicator
ASLabove sea level
ASLOAircraft Security Logging Overview
ASMairspace management
ASMavailable seat miles
ASRAirport surveillance radar
ASUAvionics switching unit
ATAAir Transport Association
ATAGAir Transport Action Group
ATCair traffic control
ATCCair traffic control centre
ATCTAirport traffic control tower
ATCRBSAir traffic control radar beacon system
ATCSSAir traffic control signalling system
ATDactual time of departure
ATFaerodrome traffic frequency
ATFMair traffic flow management
ATISAutomatic inal Information Service
ATMAir traffic management
ATNAeronautical Telecommunication Network
ATOApproved Training Organisation
ATPLAirline Transport Pilot Licence
ATQPAlternative Training and Qualification Programme
ATR1 1Air transportable racking
ATR2Automatic thrust restoration
ATSair traffic service
ATSAWAirborne traffic situational awareness
ATSUAir traffic services unit
ATTCSAutomatic Take-off Thrust Control System
AUPRTAAirplane Upset Prevention & Recovery Training Aid
AvionicsAviation electronics
AVSA"Adjust vertical speed adjust"
AWACSAirborne Warning and Control System
AWBSAviation weather briefing service
AWGAmerican Wire Gage
AWISAviation weather information service
AWOSAutomated weather observation system
AWWSAviation weather web site
B RNAVBasic area navigation
BAROBarometric indication, setting or pressure
baro-VNAVBarometric vertical navigation
BCback course
BCAABelgian Civil Aviation Authority
BDCbottom dead centre
BDIbearing distance indicator
BFLbalanced field length
BFRbiennial flight review
BGANBroadcast Global Area Network
BERbeyond economic repair
BHPbrake horsepower
BITEBuilt-In Test Equipment
BLButt Line
BMEBridge Mounted Equipment
B/PBlue Print
BPRbypass ratio
BOMbill of material
BTVBrake-to-Vacate System
BWCbird watch condition
BVIDBarely Visible Impact Damage
BVRBeyond Visual Range
C2command and control
CAACivil Aviation Authority
CACTCSCabin Air Conditioning and Temperature Control System
CAICaution Advisory Panel
CAMcockpit area microphone
CAMEContinuing Airworthiness Management Exposition
CAMOContinuing Airworthiness Management Organisation
CAMPContinuous Airworthiness Maintenance Program (FAA)
CAN busController Area Network
CANSOCivil Air Navigation Services Organisation
CAPcabin attendant panel
CARcivil aviation regulation
CARscivil aviation regulations
CARSCanadian Aviation Regulations
CAScalibrated airspeed
CASSCommercial Air Service Standards
CASScontinuing analysis and surveillance system
CAT (I–IIIc)Operational performance Category
CAT1clear air turbulence
CAT2Commercial Air Transport
CAVOKCeiling and Visibility OK
CAVUCeiling and Visibility Unlimited
CAWcontinuing airworthiness (EASA)
CBCumulonimbus cloud
CBTcomputer-based training
CCRsclosed circuit mixed gas rebreathers
CCRsconstant current regulators
CDAContinuous descent approach
CDCCLcritical design configuration control limitation
CDIcourse deviation indicator
CDUControl Display Unit
CDFAContinuous Descent Final Approach
CDTICockpit display of traffic information
CDLconfiguration deviation list
CDUcontrol/display unit
CFITcontrolled flight into terrain
CFGconstant frequency generator
CFRCode of Federal Regulations
CGcenter of gravity
CHCourse Heading
CHDOcertificate-holding district office (FAA)
CHPCourse Heading Panel
CHTCylinder Head Temperature (Piston engine aviation)
CIcost index
C/LCentre line
CMCcentral maintenance computer
CMMcomponent maintenance manual
CMOCertificate Management Office
CMVconverted meteorological visibility
CMPAcomplex motor-powered aircraft
CMUCommunications Management Unit
CNSCommunication, navigation and surveillance
CNS/ATMCommunication, navigation and surveillance / Air traffic management
CofACertificate of airworthiness
COMM or COMCommunications transceiver, Communications receiver, or Communications radio transmitter
CORSIACarbon Offsetting and Reduction Scheme for International Aviation
COTSCommercial off-the-shelf
CPAClosest point of approach
CPDLCcontroller–pilot data link communications
CPRChanged product rule
CPSCycles per second
CRDComment-response document (EASA)
CRESCorrosion resistant steel
CRMCrew resource management
CRTCathode ray tube
CScertification specification (EASA)
CSDconstant speed drive
CSDBCommercial Standard Digital Bus
CSDBCollins Standard Digital Bus
CSNCycles since new
CSOcycles since overhaul
CSScabin services system
CSUconstant speed unit
CSCTConfiguration Item Signer Crater Tool
CTAFcommon traffic advisory frequency
CTRcontrolled traffic region/control zone
CV/DFDRCockpit voice and digital flight data recorder
CVRcockpit voice recorder
CWScontrol wheel steering
DCompass Deviation
DA/Hdecision altitude/height (rel. to THR)
DA1Decision Altitude
DA2density altitude
DA3Drift angle
DAHdesign approval holder (EASA)
DAPsDownlink of aircraft parameters
DBERdamaged beyond economic repair
DCDUDatalink control and display unit
DCLDeparture Clearance via CPDLC
DCPDisplay control panel
DDGDispatch deviation guide
DEFDARSDigital Expandable Flight Data Acquisition and Recording System
DERdeparture end of runway
DERDesignated Engineering Representative
DEUdisplay electronic unit
DFDRDigital Flight Data Recorder
DFMCDual Frequency Multiple Constellation
DGdirectional gyro
DGPSdifferential GPS
DGRDangerous Goods Regulation
DHDecision height
DLRdatalink recorder
DLRGerman Aerospace Center / Deutsches Zentrum für Luft- und Raumfahrt e.V.
DMEdistance measuring equipment
DMEDesignated Mechanic Examiner
DMIdeferred maintenance item
DNCDirect noise canceling
DOdesign organization
DOAdesign organization approval
DOMdesign organization manual
DODARdiagnose, options, decide, act/assign, review
DOWdry operational weight
DPDeparture Procedures
DPUDisplay Processor Unit
DRdead reckoning
DSPDigital signal processing
DTOdeclared training organisation
DTUData transfer unit
DUATSDirect User Access inal Service
DVEDegraded Visual Environment
DRMCDirect Reading Magnetic Compass
EAengineering authorisation
EADIElectronic Attitude Direction Indicator
EASequivalent airspeed
EASAEuropean Aviation Safety Agency
EATexpected approach time
EBOMengineering Bill of Material
EBUengine build-up
ECengineering control (also E/C)
ECAMelectronic centralised aircraft monitor
ECETend of civil evening twilight
ECREngineering Change Request
ECSEnvironmental control system
ECUEngine Control Unit (=EEC)
EDRengineering data record
EDTOextended diversion time operations
EECelectronic engine control
EETestimated elapsed time
EFBelectronic flight bag
EFC1Engine Flight Cycle
EFC2expect further clearance
EFDElectronic flight display
EFFRAengine failure flap retraction altitude
EFISelectronic flight instrument system
EFHEngine Flight Hour
EFPengine failure procedure
EFSelevator feel shift
EFTOengine failure on take-off
EGPWSenhanced ground proximity warning system
EGIEmbedded GPS Inertial
EGNOSEuropean Geostationary Navigation Overlay Service
EGTexhaust gas temperature
EHMengine health monitoring
EHSEnhanced surveillance
EHSIElectronic Horizontal Situation Indicator
EICASengine-indicating and crew-alerting system
EISElectronic Instrument System
E-LSAexperimental light-sport aircraft
ELACelevator and aileron computer
ELOSEquivalent Level of Safety
ELTemergency locator transmitter
EMASengineered materials arresting system
EMDPelectric motor driven pump
ENCElectronic noise canceling
ENCASIAEuropean Network of Civil Aviation Safety Investigation Authorities
ENRElectronic noise reduction
EOBTestimated off-blocktime
EPAEuropean part approval (EASA)
EPRengine pressure ratio
EPUEmergency Power Unit
ERAMEn Route Automation Modernization
ERMengineering request for maintenance
ESAemergency safe altitude
ETAestimated time of arrival
ETDestimated time of departure
ETEestimated time en route
ETLeffective translational lift
ETOPSExtended-range Twin-engine Operation Performance Standards
ETSOEuropean Technical Standard Order, issued by EASA; see TSO
EUROCAEEuropean Organisation for Civil Aviation Equipment
EVASEmergency Vision Assurance System
EVSIEnhanced Vision Systems Instrument
EVSEnhanced Vision Systems
EWEmpty Weight
FAAFederal Aviation Administration
FACFinal approach course
FACFfinal approach course fix
FADECfull authority digital engine control
FACFlight Augmentation computer
FAFfinal approach fix
FAFfirst available flight
FANSFuture Air Navigation System
FAPfinal approach point
FAPforward attendant panel
FARFederal Aviation Regulation
FAR/AIMFederal Aviation Regulation /
Aeronautical Information Manual
FAROSfinal approach runway occupancy signal
FASfinal approach segment
FATFree air temperature
FATOfinal approach and take off
FBWinds aloft
FBOfixed-base operator
FBSfixed base simulator
FCCFlight Control Computer
FCflight crew
FCFfunctional flight check
FCMCFuel Control & Monitoring Computer
FCOMflight crew operating manual
FCSflight control system
FCTMflight crew training manual
FCUfuel control unit
FDflight director
FDupper winds and temperature forecast
FDAUflight-data acquisition unit
FDMflight data monitoring
FDPflight duty period
FDPSflight plan data processing system
FDRflight data recorder
FDRSflight data recorder system
FDTLflight duty time limitations
FDUflux detector unit
FEPfinal end point
FFfuel flow
FFDZfree fall drop zone (parachutists)
FFSfull flight simulator
FGFlight Guidance
FICflight information centre
FIDOFog Investigation and Dispersal Operation
FIKIFlight Into Known Icing
FIRflight information region
FISFederal Inspection Services
FIS-BFlight information services – broadcast
FISEflight information service enroute
FLflight level
FLIRForward-looking infra-red
FLTAForward-looking terrain avoidance
FMfrequency modulation
FMAflight mode annunciator
FMCflight management computer (part of a FMS)
FMGCFlight management and guidance computer
FMSflight management system
F/OFirst Officer
FOBFuel On-Board
FODforeign object damage
FOOflight operations officer
FOQAflight operational quality assurance
FPAflight path angle
FPLfiled flight plan
FPMfeet per minute
FQISFuel Quantity Indication System
FSDOFlight Standards District Office (FAA)
FSFFlight Safety Foundation
FSIMSFlight Standards Information Management System (FAA)
FSSflight service station
FTDflight training device
FTLflight time limitations
FVUflux valve unit
FWSFlight warning system
FYDSFlight director / yaw damper system
GAgeneral aviation
G/A or GAgo-around
GASTGBAS Approach Service Type
GBASGround based augmentation system
GCASGround collision avoidance system
GBSTground-based, software tool
GCAGround-controlled approach
GCUgenerator control unit
GDOPGeometric dilution of precision
GEAGround effect area
GGSGlobal positioning system ground station
GLOCg-induced loss of consciousness
GLONASSGlobal Navigation Satellite System
GLNSGPS Landing and Navigation System
GLNUGPS Landing and Navigation Unit
GLSGBAS Landing System
GLUGPS landing unit
GMguidance material (EASA)
GMMgeneral maintenance manual
GMTGreenwich Mean Time
GPglide path
GPPgeneral practices and procedures
GPSGlobal Positioning System
GPUGround Power Unit
GPWSground proximity warning system
GSEground support equipment
GUMPSGas, Undercarriage, Mixture, Propeller, Seat belts/Switches
HAAHeight above airport
HATHeight Above Touchdown
HAZMATHazardous Material
HBCSHigh Bandwidth Connectivity System
HDBHorizontal Deviation Bar (GS)
HDG SELHeading select
HDIHorizontal Deviation Indicator
HDOPHorizontal dilution of precision
HFHigh frequency
HFEHuman Factors Engineering
HFESHuman Factors and Ergonomics Society
"HgInch of Mercury
HHLDHeading hold
HIGEhover in ground effect
HIRLHigh Intensity Runway lighting
HIROHigh Intensity Runway Operation
HIRTAHigh Intensity Radio Transmission Area
HIWASHazardous Inflight Weather Advisory Service
HLHeight loss
HMGhydraulic motor generator
HMDHelmet-mounted display
HMUhydro-mechanical unit
HOGEhover out of ground effect
HPAhuman-powered aircraft
HPChigh pressure compressor
HPRHigh Pressure Rotor
HPThigh pressure turbine
HPTACChigh pressure turbine active clearance control
HSDHigh-speed data
HSIhorizontal situation indicator
HSLHeading select
HUDhead-up display
HUMHuman Remains
HUMSHealth and usage monitoring systems
HYDIMhydraulic interface module
IACinstrument approach chart
IAFinitial approach fix
IANIntegrated Approach Navigation
IAPinstrument approach procedure
IASindicated airspeed
IATAInternational Air Transport Association
ICAInstructions for Continuous Airworthiness
ICAOInternational Civil Aviation Organization
ICASInternational Council of the Aeronautical Sciences
ICDinterface control document
ICOidle cut-off
ICTSice-contaminated tailplane stall
IDidentify/identification or identifier
IDGintegrated drive generator
IDSinformation display system
IEPRintegrated engine pressure ratio
IETMinteractive electronic technical manual
IFinediate approach fix
IFAInternational Federation of Airworthiness
IFATCAInternational Federation of Air Traffic Controllers' Associations
IFEin-flight entertainment
IFFidentification friend or foe
IFICSintegrated flight instrument and control system
IFPinstrument flight procedure
IFRinstrument flight rules
IFSDin-flight shutdown
IGVinlet guide vane
ILSinstrument landing system
IMCinstrument meteorological conditions
IMLinside mold line
InHginch of mercury
INSinertial navigation system
IPCillustrated parts catalog (e.g. by Boeing, Airbus)
IRinitial release
IRSinertial reference system
IRTinstrument rating test
IRUinertial reference unit
IRVRinstrumented runway visual range
ISAInternational Standard Atmosphere
ISFDintegrated standby flight display
ISISintegrated standby instrument system
ISPintegrated switching panel
ITARInternational Traffic in Arms Regulations
ITTinterstage turbine temperature
IVSIinstantaneous vertical speed indicator
JAAJoint Aviation Authorities
JARJoint Aviation Requirements
JTIDSJoint Tactical Information Distribution System
KCASknots calibrated airspeed
KIASknots indicated airspeed
KREkey risk element
KTASknots true airspeed
LAASLocal Area Augmentation System
LADGPSLocal Area Differential GPS
LAHSOLand And Hold Short Operations
LAMElicensed aircraft maintenance engineer
LCClow-cost carrier
LCDLiquid crystal display
LCGload classification group
LCNload classification number
LDAlanding distance available
LDAlocalizer type directional aid
LDGPSlocal area differential global positioning satellite
LDRlanding distance required
LEDlight-emitting diode
LHOlive human organs
LHSleft hand seat
LIRLoading Instruction Report
LKPlast known position
LLCLife Limited Component
LLPLife Limited Part
LMland and marine
LMMLocator middle marker
LNAVlateral navigation
LOAletter of authorization
LOCloss of control
LOCIloss of control inflight
LOFTline-oriented flight training
LOMlimitation of movement
LOMlocator outer marker
LOPALocation of Passenger Accommodations
LORANLong-range navigation
LOTCloss of thrust control
LPClow pressure compressor
LPRLow Pressure Rotor
LPTlow pressure turbine
LPTACClow pressure turbine active clearance control
LPVlocalizer performance with vertical guidance
LRClong range cruise
LRUline-replaceable unit
LSAPloadable software aircraft part (EASA)
LSASlongitudinal stability augmentation system
LTCline training captain
LTELoss of Tail Rotor Effectiveness
LTPlanding threshold point
LVPlow visibility procedures
LWlanding weight
LZlanding zone
MACmean aerodynamic chord
MACmid-air collision
MAHFMissed Approach Holding Fix
MANABManual of Word s
MAPmanifold absolute pressure
MAPmissed approach point
MAPSMinimum Aviation Performance Standards
MATSManual of Air Traffic Services
MBMarker beacon
MBCMain Base Check
MCASManeuvering Characteristics Augmentation System
MCBFMean cycles between failures
MCCMulti-crew cooperation
MCDUmultifunction control display unit
MCHManufacturer Certificate Holder
MCPmode control panel
MCTmaximum continuous thrust
MCDUmulti control display unit
MDAminimum descent altitude
MDDRmaintenance deferred defect record
MDHminimum descent height
MDMmulti-disciplinary measure
MEManufacturing Engineer
MEAMinimum En-route Altitude
MEDEVACmedical evacuation
MEFmaximum elevation figure
MMELmaster minimum equipment list
MELminimum equipment list
MEPmulti-engine piston
METARmeteorological aerodrome report
MFMedium frequency
MFDmulti-function display
MFDSmulti-function display system
MFRAminimum flap retraction altitude
MHmagnetic heading
MIDSMultifunctional information distribution system
MILSPECMilitary specification
MKPMulti-function Keypad
MKRMarker beacon
MLmaintenance laptop
MLDWmaximum landing weight
MLGMain Landing Gear
MLSmicrowave landing system
MMmiddle marker
MMDMoving map display
MNPSMinimum navigation performance specifications
MOAMilitary operations area
MOCAMinimum Obstacle Clearance Altitude
Mode ATransponder pulse-code reporting
Mode BTransponder code and altitude reporting
Mode CTransponder code, altitude, and TCAS reporting
MOEmaintenance organisation exposition
MOPSMinimum Operational Performance Standard
MORAMinimum Off Route Altitude
MOSArtModular Open System Architecture
MPmanifold pressure
MPLmulti-crew pilot license
MPUMultifunction Processor Unit
MRBMaterial Review Board
MROmaintenance, repair, overhaul
MROmaintenance and repair organization
MROTMinimum Runway Occupancy Time
MRPMaterial Resources Planning
MRWmaximum ramp weight
MSAminimum safe altitude / minimum sector altitude
MSDMinimum Stabilization Distance
MSDSMaterial Safety Data Sheet
MSLmean sea level
MSLWMax. Structural Landing Weight
MSPModes S-Specific Protocol
MSSSMode S-Specific Services
MSTOWMax. Structural Take-off Weight
MSZFWMax. Structural Zero Fuel Weight
MTBFMean time between failures
MTBSVMean time between shop visit
MTBURMean time between unscheduled removals
MTOWmaximum take-off weight
MTTFMean time to failure
MVAMinimum Vectoring Altitude
MVFRMarginal visual flight rules
MZFWMaximum Zero Fuel Weight
NADPnoise abatement departure procedure
NASNational Airspace System
NAVNavigation receiver
NavaidNavigational aid
NAVCOMMCombination navigation and communications equipment
NAVSTAR-GPSNavigation Satellite Timing And Ranging
NCATNational Center for Aviation Training
NCATTNational Center for Aircraft Technician Training
NDNavigation display
NDBnon-directional beacon
NDTnon-destructive testing
NFFNo fault found
NGSnitrogen generation system
NHAnext higher assembly
NISTNational Institute of Standards and Technology
NLGnose landing gear
NLRNetherlands Aerospace Research Centre
NMNautical mile
NNCnon-normal checklist
NNMnon-normal maneuver (Boeing QRH - 737 Flight Crew Operations Manual)
NORADNorth American Aerospace Defense Command
NORDOno radio
NOTAMnotice to airmen
NOTARno tail rotor
NOZNormal Operating Zone
NPAnon-precision approach
NPAnotice of proposed amendment
NPRMnotice of proposed rulemaking
NRRnoise reduction rating
NRTCnonroutine task card
NVDNight-vision device
NTSBNational Transportation Safety Board
NTZno-transgression zone
Ncompressor speed
Nggas generator speed
Nhhigh rotor speed
Nppower turbine speed
Nrrotor speed (helicopters)
N1Low Pressure rotor (spool) speed
N2High Pressure rotor (spool) speed
OASObstacle Assessment Surface
OAToutside air temperature
OBEovercome by events
OBIOmnibearing indicator
OBSomni-bearing selector
OCAobstacle clearance altitude
OCCOperations control center
OCCMon condition / condition monitored components
OCHobstacle clearance height
OEIone engine inoperative
OEMoriginal equipment manufacturer
OFZObstacle Free Zone
OGVoutlet guide vane
OHMoverhaul manual
OISobstacle identification surface
OISOperational Information System
OMouter marker
OMLouter mold line
ONSonboard network system
ONATOnboard Network Access inal
O/ROn Request
OTSout of service
OPCoperational check
OPS/CHKoperational check
OWoperational weight
OWE/OEWOperating Weight Empty/Operating empty weight
P(as a prefix:) prohibited airspace
PApressure altitude
PAPublic address system
PAEWPersonnel and equipment working
PAHproduction approval holder
PALPilot Activated Lighting
PANS-OPSprocedures for air navigation services – aircraft operations
PAOGPre Aircraft on Ground
PAPIprecision approach path indicator
PARprecision approach radar
PATWASPilot's Automatic Telephone Weather Answering Service
PBCSperformance-based communication and surveillance
PBDplace bearing distance
PBEProtective Breathing Equipment
PBNPerformance-Based Navigation
PCproficiency check
PCLPilot Controlled Lighting
P-CodeGPS precision code
PCNpavement classification number
PDProfile descent
PDAperformance degradation allowance
PDASpublic domain aeronautical software
PDCPre-Departure Clearance
PDGprocedure design gradient
PDMpilot decision making
PDOPPosition dilution of precision
PDUpower drive unit
PETpoint of equal time
PESAPassive electronically scanned array
PFpilot flying
PFAFprecision final approach fix
PFDprimary flight display
PICPilot In Command
PICUSPilot In Command, under supervision
PIOPilot Induced Oscillations
PIPperformance improvement package
PIREPPilot Report
PJAParachute Jumping Area
PJEParachute jumping exercise
PMpilot monitoring
PMAParts Manufacturer Approval
PMCpower management computer
PMGpermanent magnet generator
PNpart number
PNDprimary navigation display
PNFpilot not flying
PNRpassive noise reduction
PNRPoint of No Return
POAProduction Organisation Approval
POBpersons on board
POFPhase of flight
POFPrinciples Of Flight
POPilot's Operating Handbook
PPLprivate pilot licence
PPRprior permission required
PRAPre-recorded announcement
PSpassenger step
PSEUProximity Switch Electronic Unit / B737
PSRpoint of safe return
PSRpower supply reset
PSRprimary surveillance radar
PSUpassenger service unit
PTCUpower transfer Control unit
PTFpermit to fly
PTRPilot Training Record
PTTpush to talk
QARquick access recorder
QCMquality and compliance monitoring
QECquick engine change
QFEthe Q-code for: Atmospheric pressure at aerodrome elevation (or at runway threshold)
QNEthe Q-code for pressure altitude
QNHthe Q-code for: Altimeter sub-scale setting to obtain elevation when on the ground, i.e. altitude above MSL
QRAquick reaction alert
QRHquick reference handbook
R(as a prefix:) restricted airspace
RAradio altitude or radar altimeter
RAresolution advisory
RAASRunway Awareness and Advisory System
RAASremote airport advisory service
Rad AltRadio Altitude
RadarRAdio Detection And Ranging
RAIRadio altimeter indicator
RAIMReceiver Autonomous Integrity Monitoring
RALTRadar or radio altimeter
RAREPSWeather Radar Reports
RASrectified air speed
RA(T)restricted area (temporary)
RATram air turbine
RCOremote communications outlet
RCRReverse current relay
RCVRRadio receiver
RDHreference datum height
RDMIRadio distance magnetic indicator
RDPRadar data processing system
REILRunway end identifier lights
REORepair engineering order
RESArunway end safety area
RFRadio frequency
RFFrescue and fire fighting
RFIRadio frequency interference
RFIrecreational flight instructor
RGBreduction gear box
RHSright hand seat
RHSMreduced horizontal separation minimal
RIAregulatory impact assessment (EASA)
RIIrequired inspection items
RLGRing laser gyroscope
RLTCRemaining Life Time Cycle
RMIradio magnetic indicator
RMPRadio Management Panel
RMTrule making task (EASA)
RNAVarea navigation
RNGRange (aeronautics)
RNPrequired navigation performance
RoCRate of climb
RoDRate of descent
RPARemotely Piloted Aircraft
RPASRemotely Piloted Aircraft System
RPLRecreational Pilot Licence
RPLrepetitive flight planning
RPMRevolutions per minute
RPTregular public transport
RSArunway safety area
RSPReversion switch panel
RSRen-route surveillance radar
RTBreturn to base
RTLrudder travel limiting
RTORejected takeoff
RTOWregulatory take-off weight
RVDTrotary variable differential transformer
RVRrunway visual range
RVSMreduced vertical separation minima
RWramp weight
RXRadio receiver
SAILSpecific assurance and integrity level
SARSearch and rescue
SARSmart ACMS Recorder
SARSurveillance Approach Radar
SASstability augmentation system
SATStatic Air Temperature
SATCOMSatellite communication
SATNAVSatellite navigation
SBservice bulletin
SBAASSatellite-Based Augmentation System
SCspecial condition
SCAPStandard Computerized Airplane Performance
SCCMsenior cabin crew member
SDSecure digital
SDFSimplified directional facility
SDUSatellite data unit
SELCALSelective calling
SEPSafety and Emergency Procedures
SEPsingle-engine piston
SESARSingle European Sky ATM Research
SESMASpecial Event Search and Master Analysis
SFCCSlat Flap Control Computer
SFOSenior First Officer
SFPShort Field Performance
SFOCSpecial Flight Operating Certificate
SIDstandard instrument departure
SIGMETSignificant Meteorological Information
SIUSatellite interface unit
SLPCsingle lever power control
SMservice manual
SMMsafety management document
SMOHSince major overhaul
SMRsurface movement radar
SMSShort Messaging Service
SMTsoftware maintenance tool
SNserial number
SNRsignal-to-noise ratio
SOCstart of climb at missed approach
SODPROsimultaneous opposite direction parallel runway operations
SOFspecial operations forces
SOGspeed over ground
SOGSpecial Operations Group
SOPstandard operating procedure
SOWStatement of Work
SPSStall Protection System
SRMstructural repair manual
SRSSpeed Reference System
SSCV/DRSolid-state cockpit voice/data recorder
SSCVRSolid-state cockpit voice recorder
SSFDRSolid-state flight data recorder
SSRSecondary surveillance radar
STARstandard inal arrival route
STARSStandard inal Automation Replacement System
STCsupplemental type certificate
STCAShort- Conflict Alert
STOLshort take-off and landing
STPStandard temperature and pressure
STSspeed trim system
SUASpecial use airspace
SVFRSpecial visual flight rules
TAtraffic advisory
TAAinal arrival altitude
TAAinal arrival area
TACthrust asymmetry compensation
TACANtactical air navigation (system)
TADTerrain awareness display
TAFinal aerodrome forecast
TAIthermal anti-ice
TALPATakeoff and Landing Performance Assessment Aviation Rules Committee
TAMtotal airport management
TARinal approach radar
TAStrue airspeed
TATtotal air temperature
TAWSterrain awareness and warning system
TBOtime between overhauls
TBVtransient bleed valve
TCTransport Canada
TCtowering cumulus
TCturn coordinator
TCTrue Course
TCtype certificate
TCAinal control area (USA/Canada)
TCAThrottle control assembly
TCAStraffic collision avoidance system
TCCATransport Canada's Civil Aviation
TCDStype certificate data sheet
TCFTerrain clearance floor
TCHthreshold crossing height
TCIthrust computer indicator
TCUTelecommunication control unit
TDOPTime dilution of precision
TDZtouchdown zone
TERPSinal instrument procedures
TFRtemporary flight restriction
TFTThin-film transistor
TGBtransfer gearbox
TGLtemporary guidance leaflet
TGL(S)touch-and-go landing(s)
TGTTurbine gas temperature
THTrue Heading
THRrunway threshold
THStrimmable horizontal stabilizer, see tailplane
TIS–BTraffic information service – broadcast
TITturbine inlet temperature
TKTrack angle
TKETrack-angle error
TLDtime-limited dispatch
TLAThree-letter acronym
TLAThrust lever angle
TLBtechnical logbook (EASA)
TLStransponder landing system
TMAinal manoeuvring area (Europe)
TMGtouring motor glider
TMLToolbox Mobile Library (Boeing)
TMZtransponder mandatory zone
TOCTop of climb
TODtop of descent (point)
TODAtake-off distance available
TO/GATakeoff/go-around switch / thrust
TOPtake-off power
TORtake-off runway
TORAtake-off runway available
TOTTurbine outlet temperature
TOWtake-off weight
TOWStake-off warning system
TRtail rotor
TRthrust reverser(s)
TRtransformer rectifier
TRtransmitter receiver or transceiver
TPturning point at missed approach
TRAtemporary reserved area (airspace)
TRACONinal radar approach control
TRANSTransmission (telecommunications)
TREtype rating examiner
TRPthrust rating panel
TRPMode S transponder
TSOtechnical standard order
TSLOVHTime since last overhaul
TSNTime since new
TTAFtotal time air frame
TTLTuned to Localizer
TTRTCAS II transmitter/receiver
TTSTime to station
TTSNtotal time since new
TTSOtotal time since overhaul
TVETotal vertical error
TWBTranscribed Weather Broadcasts
TWCtail wind component
TWDLTwo-way data link
TWDRinal Doppler Weather Radar
TWIPinal weather information for pilots
TWLUinal Wireless LAN Unit
TWRAir traffic control tower
TWRinal weather radar
UACUpper area control
UARTUniversal asynchronous receiver-transmitter
UASUnmanned Aircraft System
UAVUnmanned aerial vehicle
UHFultra-high frequency
UIRupper information region
ULBunderwater locator beacon
UPRTupset prevention and recovery training
USBUniversal Serial Bus
UTCUniversal Time Coordinated
Vmagnetic variation
VVolts or voltage
V&Vvideo & vision
VASIvisual approach slope indicator
VBVvariable bleed valve
VCRvisual control room
VCSvehicle control service
VDFVHF direction-finding
VDLVHF Data Link
VDPvisual descent point
VDRVHF digital radio
VFOVariable-frequency oscillator
VFRvisual flight rules
VGvortex generator
VGAVideo Graphics Array
VG/DGVertical gyroscope/directional gyroscope
VGMvoice generator module
VHFvery high frequency
VIDvisible impact damage
VIGVvariable inlet guide vane
VMCvisual meteorological conditions
VMCminimum control speed with critical engine out
VNAVvertical navigation
VNCVFR navigation chart
VNENever exceed speed
VNOMaximum structural cruising speed
VNRVHF navigation receiver
VORVHF omni-directional range
VOR/DMEVOR with Distance measuring equipment
VOR/MBVOR marker beacon
VORTACVOR and TACAN combination
VOXVoice transmission
VPAVertical Path Approach
VPATHVertical path
V/RVoltage regulator
VRPVisual point of reference
VRSvortex ring state
V/SVertical speed
VSCFvariable speed constant frequency
VSIvertical speed indicator
VSMVertical separation limit
VSOStall speed in landing configuration
VSVvariable stator vane
VSWRVoltage–standing wave ratio
VTAVFR inal area chart
VTOLvertical take-off and landing
V/TRKVertical track
VVIvertical velocity indicator
VXSpeed for best angle of climb
VYSpeed for best rate of climb
V1speed at or above which takeoff cannot be safely interrupted
V2speed at or above which takeoff can be done with 1 engine out
Vamaneuvering speed
Vfemaximum flaps extended speed
Vlemaximum landing gear extension speed
Vlomaximum landing gear operating speed
Vloflift-off speed
Vmcminimum control speed
Vmcavelocity of minimum control in the air
Vmcgvelocity of minimum control on ground
Vmomaximum operating speed
Vnenever-exceed speed
Vnonormal operating speed limit
Vrrotate speed
Vrarough air speed
Vrefreference touchdown speed
Vsstall speed
Vsostall speed in landing configuration
Vxbest angle of climb speed
Vybest rate of climb speed
WAASWide Area Augmentation System
WACWorld Aeronautical Chart
WATweight, altitude, temperature
W&BWeight & Balance
WCAWind Correction Angle
WDWind direction
WDMWiring Diagram Manual
WEFwith effect from
WMAWXR waveguide adapter
WMIWXR indicator mount
WMSWide-area master station
WMSCWeather message switching center
WMSCRWeather message switching center replacement
WOCLwindow of circadian low
WRTWXR receiver transmitter
WSwind shear
WTCWake Turbulence Category
WXRWeather radar system
Yyaw or yaw angle
Y/Dyaw damper
ZZulu Time
ZFTzero-fuel time
ZFWzero-fuel weight
ZULUZulu Time
“List of aviation, avionics, aerospace and aeronautical abbreviations” by Wikimedia Foundation, Modifications: is licensed under CC BY-SA 3.0