Home Info Tips Feedback

Aviation acronyms and abbreviations

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

AAEAbove Airport Elevation
AAIBAir Accidents Investigation Branch (UK)
ABMAbeam
ABN, ABNORMAbnormal
ABSAbsolute
ACAlternating Current / Advisory Circular
A/CAir Conditioning / Aircraft
ACARSARINC Communications Addressing and Reporting System
ACCELAcceleration, Accelerate(d)
ACFTAircraft
ACMAir Cycle Machine
ACMPAlternating Current Motor Pump / Electric Hydraulic Pump
ACMSAircraft Condition and Monitoring System
ACPAudio Control Panel
ACPTAccept
ACRUAir Conditioning Refrigeration Unit
ACTActive / Activate
ACUAntenna Coupler Unit
ADAirworthness Directive
ADCAir Data Computer
ADFAutomatic Direction Finder
ADGAir Driven Generator
ADIAttitude Director Indicator
ADIRSAir Data Inertial Reference System
ADIRUAir Data Inertial Reference Unit
ADJAdjusted / Adjustment
ADMAir Data Module
ADPAir Driven Pump/Air Driven Demand Hydraulic Pump
ADRAir Data Reference
ADRSAddress
ADJAdjusted / Adjustment
ADVAdvisory / Advance / Advanced
AFCSAvionic Flight Control System
AFDSAutopilot Flight Director System
AFEAbove Field Elevation
AFMAirplane Flight Manual
AFSAutoflight System / Auto flight Simulator
AFTNAeronautical Fixed Telecommunications Network
A/GAir/Ground
AGLAbove Ground Level
AIAAAmerican Institute of Aeronautics and Astronautics (US)
AIDSAircraft Integrated Data System
AILAileron / Autopilot Interlock
AIPAeronautical Information Publication
AIREPAir Report
AIRMETweather advisory service
AIUAudio Interface Unit
ALAlert
ALPAAir Line Pilots Association
ALPHAAngle of Attack for a specific configuration
ALRTAlert
ALSAutothrottle Limit Switch
ALTAltitude
ALT HOLDAltitude Hold
ALTMAltimeter
ALTNAlternate
ALT/SAltitude Select
ALWAllowable Landing Weight
AMAmplitude Modulation
AMBAmbient
AMBGAmbiguity
AMP(s)Ampere(s)
AMRAuto/Manual/Remote
AMUAudio Management Unit
AND (A.N.D.)Aircraft Nose Down
ANNUNCAnnunciator
ANTAntenna
ANU (A.N.U.)Aircraft Nose Up
AOAAngle of Attack
AP (A/P)Auto-Pilot
APBAuxiliary Power Breaker
APDApproach Progress Display
APFD(S)Autopilot Flight Director (System)
APLAirplane
APPApproach
APPRApproach
APPROXApproximately
APPUAsymmetry Position Pick-off Unit
APTAirport
APUAuxiliary Power Unit
APXAppendix
AQPAdvanced Qualifications Program
ARFFAircraft Rescue and Fire Fighting
ARINCAeronautical Radio Incorporated
ARNDAround
ARPTAirport
ARRVLArrival
ARSRAir route surveillance radar
ARTCCAir Route Traffic Control Center
ASAirspeed / Altitude Mode Switch Monitor
A/SAirspeed
ASAAutoland Status Annunciator
ASIAir Speed Indicator
ASMDAssumed
ASPAudio Selector Panel
ASAPAs Soon As Possible
ASRAirport Surveillance Radar
ASRSAviation Safety Reporting System
ASSYAssembly
ASTPAdvanced Simulation Training Program
ASYMAssymetrical / Asymmetry
A/SAirspeed
A/SKIDAnti Skid
A/TAutothrottle
ATAActual Time of Arrival / Air Transport Associaton
ATCAir Traffic Control
ATCRBSATC radar beacon system
ATC/DABSAir Traffic Control/Discrete Address Beacon System
ATEAutomatic Test Equipment
A/THRAuto Thrust Function
ATISAutomatic Terminal Information Service
ATMAir Turbine Machine
ATSAuto Thrust System / Autothrottle System
ATTAttitude
ATTNDAttendant
AUGAugmentation
AUTOAutomatic
AUXAuxiliary
A/VAuto-Visual
AVAILAvailable
AVGAverage
AVMAirborne Vibration Monitor
AVSAudio Visual System
AWOSAutomated Weather Observation System
AWYAirway
AZVertical Acceleration
AZIMAzimuth
AzMKRAzimuth Marker

BALBalance
BAROBarometric
BATBattery
BBBroadband
B/BBack Beam
BCBack Course
BCDSBite Centralized Data System
BCKBack
BCLBattery Charge Limiter
BCNBeacon
B/CRS (B CRS)Back Course
BEVBeverage
BFBoarded Fuel
BFEBuyer Furnished Equipment
BFOBeat Frequency Oscillator
BITBuilt In Test
BITEBuilt In Test Equipment
BIUBite Interface Unit
BKBrake
BKGRDBackground
BKRBreaker (Circuit Breaker)
BKSBrakes
BLDBleed
BLKBlock
BMCBleed Air Monitoring Computer
BMVBrake Metering Valve
BNRBinary
BODBottom of Descent
BRFBrief(ing)
BRGBearing
BRKBrake
BRKNGBreaking
BRKR(S)Breaker(s)
BRTBright
BSBritish Standard
BSCUBrake System Control Unit
BAYBusy
BTB(S)Bus Tie Breaker(s)
BTCBus Tie Contactor
BTLBottle
BTRBus Tie Relay
BTUBritish Thermal Unit
B/UBackup
BUFBuffet (as in buffet speed)
BUSBus Bar

CCenter
ºCDegrees Centigrade
CAACivil Aviation Authority (UK) / Civil Aeronautics Agency (US)
CAPCapture
CAPTCaptain
CASCalibrated Airspeed
CATClear air turbulence
CB(S), C/BCircuit Breaker(s)
CBMSCircuit Breaker Monitoring System
CCACentral Control Actuator
CCWCounterclockwise
CDLConfiguration Deviation list
CDUControl Display Unit
CFDIUCentralized Fault Data Interface Unit
CFDSCentralized Fault Display System
CFMCubic Feet Per Minute
CGCenter Of Gravity
CHANChannel
CHGChange
CHRChronograph
CHRGRCharger
CIDSCabin Intercommunication Data System
CISCabin Interphone System
CKCheck
CKTCircuit
CLBClimb
C/LCheck List
CLClose
CLBClimb
CLKClock
CLRClear
CLSDClosed
CMDCommand
CMPTRComputer
CNXCancelled
COCompany
COMMCommunication
COMPCompressor
COMPCompartment
CONContinous
CONDCondition
CONFConfiguration
CONFIGConfiguration
CONNConnection
CONTControl / Continuous
CORRCorrection
CO RTECompany Route
CPControl Panel
CPCSCabin Pressure Control System
CPCUCabin Pressure Controller Unit
CRCContinuous Repetitive Chime
CRGCargo
CRSCourse
CRTCathode Ray Tube
CRZCruise
CSCUCargo Smoke Control Unit
CSDConstant Speed Drive
CSEUControl System Electronic Unit
CSM/GConstant Speed Motor/Generator
CSTRConstraint
CTL PNLControl Panel
CTRContour / Center
CUControl Unit
CVRCockpit Voice Recorder
CVRDACockpit Voice Recorder
CWClockwise
CWSContorl Wheel Steering

DADrift Angle
DARDigital AIDS Recorder
DCDirect Current
DCVDirectional Control Valve
DDRMIDigital distance and Radio Magnetic Indicator
DECELDecelerate(d)
DECRDecrease
DEDDedicated
DEGDegree
DEMDemand
DEPRDepressurize
DEPTDeparture
DERDesignated Engineering Representative
DESDescent
DESTDestination
DETDetector
DFADelayed Flap Approach
DEVDeviation
DFDAUDigital Flight Data Acquisition Unit
DFDRDigital Flight Data Recorder
DGACDirection Générale de l'Aviation Civile
DHDecision Height
DIFFDifferential
DIRDirect / Direction
DIR TODirect To
DISCDisconnect
DISCHDischarge
DISCONTDiscontinued
DISPDispatch
DISTDistance
DITSDigital Information Transfer System
DKDeck
DMCDisplay Management Computer
DMEDistance Measuring Equipment
DMUData Management Unit (Aids)
DNDown
DNTKFXDown Track Fix
DRDead reckoning / Door
DSDLDedicated Serial Data Link
DSPLDisplay
DTGDistance To Go
DUDisplay Unit

EEast
EADIElectronic Attitude Director Indicator
EASEquivalent Airspeed
EBUEngine Build-Up
ECAMElectronic Centralized Aircraft Monitoring Computer / Electronic Control and Maintenance display
ECBElectronic Control Box (APU)
ECMEngine Condition Monitoring
ECONEconomic
ECPECAM Control Panel
ECSEnvironmental Control System
ECUEngine Control Unit
E/DEnd of Descent
EDPEngine Driven Pump / Engine Primary Hydraulic Pump
E/EElectrical / Electronic
EECElectronic Engine Control
EELEmergency Exit Lights / Emergency Escape Path Lighting
EETEstimated Elapsed Time
EFCExpect Further Clearance
EFCSElectronic Flight Control System
EFIElectronic Fligh Instruments
EFISElectronic Flight Instrument System
EFOBEstimated Fuel On Board
EGTExhaust Gas Temperature
EHFExtremely high frequency
EHSIElectronic Horizontal Situation Indicator
EICASEngine Indication and Crew Alerting System
EISElectronic Instruments System
EIUEngine Interface Unit
ELElevator
ELACElevator Aileron Computer
ELCUElectrical Load Control Unit
ELECElectrical / Electrics
ELEVElevator
ELFExtremely low frequency
ELVElevation
EMEREmergency
EMER GENEmergency Generator
EMIElectro-Magnetic Interference
ENGEngine
ENRTEnroute
ENTEnter
ENTMTEntertainment
ENTREnter
EO, E/OEngine Out
EPEEstimated Position Error
EPIElevator Position Indicator
EPREngine Pressure Ratio
EPRLEPR Limit
EQPTEquipment
EQUIVEquivalent
ERExtended Range
EROPSExtended Range Operatations
ERRError
ESSEssential
ESTEstimated
ETElapsed Time
ETAEstimated Time of Arrival
ETEEstimated Time en Route
ETOPSExtended-Range Twin Engine Operations
ETPEqual Time Point
ETTEstimated Takeoff Time
EUROCAEEuropean Organization for Civil Aviation Electronics
EVACEvacuation
EVMUEngine Vibration Monitoring Unit
E/WDEngine / Warning Display
EXCDExceedances
EXECExecute
EXHExhaust
EXPEDExpedite
EXTExtend(ed) / Extension / Exterior / External
EXTENExtension
EXT PWR External Power

F, FºFarenheit Degrees
F/AFlight Attendant
FAAFederal Aviation Administration
FACFlight Augmentation Computer
FACTRFactor
FADECFull Authority Digital Engine Control System
FAFFinal Approach Fix
FARFederal Aviation Regulation(s)
FAVFan Air Valve
FBWFly-by-wire.
F/CFlight Crew
FCCFlight Control Computer / Federal Communications Commission
FCDCFlight Control Data Concentrator
FCSTForecast
FCUFlight Control Unit
FD, F/DFlight Director
FDAUFlight Data Acquisition Unit
FDIUFlight Data Interface Unit
FDRFlight Data Recorder
FDU Fire Detection Unit
FEFlight Engineer
FF, F/FFuel Flow
FFRATSFull Flight Regime Autothrottle System
FGFlight Guidance
FGCFlight Guidance Computer
FGSFlight Guidance System
FHFlight Handbook
FIDDSFault Isolation and Detection Display System
FIDS Fault Isolation and Detection System
FILTFilter
FIRMFault Isolation Reporting Manual
FLFlight Level
FLCH, FL CHFlight Level Change
FLIFOFlight Information
FLPFlap
FLT Flight
FLT CTLFlight Control
FMFlight Management / Frequency modulation
FMAFlight Mode Annunciator
FMCFlight Management Computer
FMCSFlight Management Computer System
FMECAFailure Modes Effects and Criticality Analysis
FMGCFlight Management Guidance Computer
FMGSFlight Management Guidance System
FMSFlight Management System
FMUFuel Metering Unit
FOFlyover
F/OFirst Officer
FOB Fuel on Board
FODForeign Object Damage
FOGFiber Optics Gyro
FOMFlight Operations Manual
FOTMFlight Operations Training Manual
F-PLNFlight Plan
FPAFlight Path Angle
FPLFlight Plan
FPMFeet Per Minute
FPPU Feed-Back Position Pick-Off Unit
FPSFlight Per Second
FPTFlight Plan Time
FPVFlight Path Vector
FQFuel Quanity
FQI/FQUFuel Quantity Indication / Unit
FRFrom
FREQFrequency
FRMFalut Reporting Manual
FRTFront
FRVFuel Return Valve
FSFlight Safety / Fast Slew
F/SFast/Slow (indicator)
FSEUFlap/Slat Electronic Unit
FSFFlight Safety Foundation
FSSFlight Service Station
FTFoot Feet.
FTAFault Tree Analysis
FTMFlight Training Manual
FT/MNFeet per Minute
FUFuel Used
FWDForward
FWCFlight Warning Computer
FWSFlight Warning System

GGravity (G-Force) / Gyro (flag on ADI)
G/AGo Around
GAGo Around
GBGenerator Breaker
GCAGround Controlled Approach
GCRGenerator Control Relay
GCUGenerator Control Unit
GEGenral Electric
GENGenerator
GFRGenerator Field Relay
GLCGenerator Line Contractor
GLYGalley
GMTGreenwich Mean Time
GNDGround
GPGeneral Purpose
GPCU Ground Power Control Unit
GPHGallons Per Hour
GPMGallons Per Minute
GPSGlobal Positioning System (Navstar)
GPUGround Power Unit
GPWSGround Proximity Warning System
GRGear / Generator Relay
GRDGround
GRNDGround
GRPGeographic Reference Point
GRVTYGravity
GSGround Speed
G/SGlide Slope
GSEGround support equipment
GTOWGross Takeoff Weight
GWGross Weight

HHour, Hot
HAHalon fire extenguisher
HCUHydraulic Control Unit
HDBKHandbook
HDGHeading
HDG/SHeading Select
HDLHandle
HDWDHeadwind
HFHigh Frequency
HGHeading
HIHigh
HIRFHigh Intensity Radiated Field
HLDHold / Holding
HMGHydraulic Motor Generator
HMUHydro-Mechanical Unit
HOLHigh-Order Language
HOTHigh Oil Temperature
HPHigh Pressure
HPAHectopascals
HPVHigh Pressure Valve
HRHour
HSIHorizontal Situation Indicator
HTHeight / Heat
HTRHeater
HUDHead Up Display
HUMIDHumidifier
H/WindHeadwind
HYDHydraulics
HZHertz (cycles per second in alternating current)

IAFInitial Approach Fix
IASIndicated Airspeed
IATAInternational Air Transport Association
IAWIn Accordance With
I/CInspection/Check
ICAOInternational Civil Aviation Organization
ICUInstrument Comparator Unit / Indicator Control Unit
IDENTIdentification
IDGIntegrated Drive Generator
IDSIntegrated Display System
IDUInteractive Display Unit
I.E.That Is
IFRInstrument Flight Rules
IGNIgnition
ILLUMIlluminate / Illuminated
ILSInstrument Landing System
IMBALImbalance
IMCInstrument Meterorological Conditions
IMMImmediate
IMPImperial
INInch(es)
INBInbound
INBDInboard
INBOInboard
INBRDInboard
INCIncorporated
INCRIncrease
INCREMIncrement
INDIndicator
INFLTInflight
INHBInhibit
INITInitialization / Initialize
INOPInoperative
INPHInterphone
INRInner
INSInertial Reference System
INST(S)Instrument(s)
INSTRInstrument
INTInterphone / Initialization / Intensity
INTCIntercept
INTCPIntercept
INTPHInterphone
INVInverter
I/OInput/Output
IOEInitial Operating Experience
IPIntermediate Pressure/Input/Intercept Profile/Initial Point
IPCIntermediate Pressure Check valve
IPPUInstrumentation Position Pick-off Unit
IRInfrared / Infrared Radiation
IRSInertial Reference System
IRUInertial Reference Unit
ISAInternational Standard Atmosphere
ISBInter-System Bus
ISDUInertial Sensor Display Unit
ISLNIsolation
ISOLIsolate / Isolated / Isolation (valve)
IVSIInstantaneous Vertical Speed Indicator
IV&VIndependent Validation and Verification

JAAJoint Aviation Authorities
JARJoint Aviation Regulations
JEPPJeppeson
JETTJettison
JP(4), (5)Military Jet Fuel

K,KT,KTSKnots
KEASKnots Equivalent Airspeed
KG(S)Kilograms(s)
KHZKilohertz
KIASKnots Indicated Airspeed
KIFISKollsman Integrated Flight Instrument System
KIASKnots Indicated Airspeed
KTKnot
KTASKnots True Airspeed
KVAKilovolt-Ampere
KVARKilovolt-Ampere Reactive
KW(S)Kilowatt(s)

LLeft
LAFLoad Alleviation Function
LANDAutoland mode annunciation
LATLatitude, Lateral
LAT REVLateral Revision
LAVLavatory
LB(S)Pound(s) / Left Bank
LBALuftfahrt Bundesamt
LCALine Check Airman
LCDLiquid Crystal Display
LCNLoad Classification Number
LDLoad; a unitized cargo loading container, ie LD-3
LDALocalizer type approach
LDGLanding
LDG GRLanding Gear
LDOCLong Distance Operational Control
LELeading Edge
LECLecture
LEDLight Emitting Diode
LFLow Frequency / Left Front
LFTLeft
LG, L/GLanding Gear
LGCIULanding Gear Control Interface Unit
LGPIULanding Gear Position Indicating Unit
LGTLight
LGWLanding Gross Weight
LHLeft Hand
LIMLimit / Limitation
LISLocalizer Inertial Smoothing
LKLock
LKDLocked
LLLatitude / longitude
LLGLower Lobe Galley
LLS, LLSKLeft Line Select Key
LLWASLow Level Wind Shear Alerting System
LMLow Minimums
LMMLocator Middle Marker
LMRLoad Monitor Relay
L NAV, LNAVLateral Navigation
LNDGLanding
LOLow
LOCLocalizer
LOFTLine Oriented Flight Trainng
LOGOLogographic
LOMLocator Outer Marker
LONGLontitude
LOPLine Of Position / Low Oil Pressure
LORANLong Range Navigation
LOSLoss of Signal / Line Oriented Simulation
LNLeft Nose
LPLow Pressure
LPMLiter Per Minute
LRLeft Rear
LRCLong Range Cruise
LRRALow Range Radio Altimeter
LRULine Replacable Unit
LSLine Select
L&SLimits and Specifications
LSBLower Side Band
LSKLine Select Key
LSPLimit Select Panel
LSULavatory Service Unit
LT(S)Light(s) / Left
LVLLevel
LVL/CHLevel Change
LWLeft Wing / Landing Weight
LWDLeft Wing Down
LWRLower

MMach / Machine / Meter / Magenta
MACMean Aerodynamic Chord / Military Airlift Command
M.A.C.Mean Aeordynamic Chord
MAGMagnetic
MAG DECMagnetic Declination
MAG VARMagnetic Variation
MAINTMaintenance
MALFMalfunction
MANManual / Manifold
MANFLDManifold
MAPMissed Approach Point
M/AS, MASMach Airspeed
MASIMach Airspeed Indicator
MAXMaximum
MAX CLBMaximum Climb
MAX DESMaximum Descent
MAX ENDMaximum endurance
MBMillibar(s)
MCAMinimum Crossing Altitude
MCDPMantenance Control and Display Panel
MCDUMultifunction Control and Display Unit
MCPMode Control Panel
MCTMaximum Continuous Thrust
MCUModular Concept Unit
MCWMaximum Cruise Weight
MDAMinimum Descent Altitude
MDHMinimum Descent Height
MDLFMinimum Desired Landing Fuel
MEAMinimum Enroute Altitude
MECMain Engine Control
MECHMechanic / Mechanical
MEDMedium
MELMinimum Equipment List
MEMMemory
MESCMid Electronic Service Center
MEWManufactureÕs Empty Weight
MFMedium Freqency
MFAMemorized Fault Annunciator
MGMTManagement
MGTManagement
MHZMegahertz
MIMiles
MICMicrophone
MIDMiddle
MIKEMicrophone
MINMinimum
MISCMiscellaneous
MKRMarker / Range Marks
MLGMain Landing Gear
MLSMicrowave Landing System
MLWMaximum Landing Weight
MMMiddle Marker
MMELMaster Minimum Equipment List
MMOMaximum Mach Operating Speed
MNMain / Mach Number / Minute
MOCAMinimum Obstruction (Obstacle) Clearance Altitude
MODModule / Modification
MOMMomentary Contact
MONMonitor
MONITRMonitor
MPHMiles Per Hour
MPMMiles Per Minute
MRAMinimum Reception Altitude
MRCMaximum Range Cruise
MRIUMaintenance and Recording Interface Unit
MRMMaintenance Reporting Manual
MSAMinimum Safe Altitude
MSGMessage
MSLMean Sea Level
MSUMode Select Unit
M-SPDManual Speed
MSUMode Selector Unit
MTBFMean Time Between Failure
MTCEMaintenance
MTGMiles To Go
MTNCEMaintenance
MTOGWMaximum Takeoff Gross Weight
MTOWMaximum Takeoff Weight
MTRSMeters
MTWMaximum Taxi Weight
MUManagement Unit
MUXMultiplexer / Multiplex
MZMelt Zone (Fuse Plug)
MZFWMaximum Zero Fuel Weight

NNorth / Nose / Normal
NAPU or Engine RPM (%)
N1Low Pressure Compressor
N2High / Intermediate Pressure Compressor
N3High Pressure Compressor
N/A, (NA)Not Applicable
NACNacelle
NACANational Advisory Committee for Aeronautics
NAINacelle Anti Ice
NAMNautical Air Miles
NASANational Aeronautics and Space Administration
NAVNavigation
NAVAIDNavigation Aid
NBNon-directional Radio Beacon
NDNavigation Display
NDBNon-directional Radio Beacon / Nav Database
NEGNegative
NEUTNeutral
NEGNegative
NFONon Fly Over
NGMNautical Ground Miles
NLGNose Landing Gear
NMNautical Mile(s)
NO.Number
NOCOMNo Communications
NORMNormal
NoPTNo Procedure Turn
NORDONo Radio
NORMNormal
NOTAMNotice to Airmen
NOZZNozzle
NTSBNational Transportation Safety Board
NWNose Wheel
NWSNose Wheel Steering
NXTNext

O2Oxygen
OATOutside Air Temperature
OBRMOn Board Replacement Module
OBSObserver
OCAOceanic Control Area / Obstacle Clearance Altitude
OEWOperating Empty Weight
OFF/ROff Reset
OFSTOffset
OGWOperating Gross Weight
OHTOverheat
OKOkay
OMOuter Marker
OMCObserver Member of the Crew
OMNIOmnidirectional Navigation Radio
ONSOmega Navigation System
OPOpen / Operating
O/POutput
OPMOperating Performance Manual
OPPOpposite
OPROperate
OPRNOperation
OPTOptimum
ORIDEOverride
OUTBOutbound
OUTBD, OUTBRDOutboard
OUTROuter
OVBDOverboard
OVHDOverhead
OVHT, OHOverheat
OVRDOverride
OVRDNOverridden
OVSPDOverspeed
OW, O/WOverwater
OWEOperating Empty Weight
OXY Oxygen

PPanel
PAPassenger Address
PACPilot at Controls / Pack (airconditioning)
PACKAirconditioning Package
PAMPulse amplitude modulation
PAPRPaper
PARPrecision approach radar
PASSPassenger
PAXPassengers
PBPushbutton
PBEProtective Breathing Equipment
PCAPower Control Actuator
PCIPPrecipitation
PCUPower Control Unit
P-DESProfile Descent
PDIPictorial Deviation Indicator
PDSPrimary Diversion Station
PDUPilot Display Unit / Power Drive Unit
PEDPedestal
PENDPendant
PE/PSPassenger Entertainment/Passenger Service System
PERFPerformance
PERSPersonnel
PESPassenger Entertainment System / Pitch Enhancement System
PFPilot Flying
PFCPorous Friction Course Overlay (runway Surface)
PFCSPrimary Flight Control System
PFDPrimary Flight Display
PFMPulse frequency modulation / Pure Flipping Magic
PHCProbe Heat Computer
PICPilot In Command
PKPark
PKSPacks
PLPayload
PLANEFIS Mode
PLIPitch Limit Indicator
PLNGPlanning
PLSPitch Limit Symbol
PLT(S)Pilot(s)
PMPhase modulation / Afternoon
PMAPermanent Magnet Alternator
PMCPower Management Control
PMGPermanent Magent Generator
PMPPump
PMSPerformance Managememt System
PNEUPneumatic
PNFPilot Not Flying
PNLPanel
PNRPoint of No Return
POOutside Air Pressure
POBPressure Off Brake
PODPoint of Descent
POIPrincipal Operations Inspector
POSPosition / Positive
POVMCPlanned to Operate in Visual Meteorological Conditions
PPHPounds Per Hour
PPOSPresent Position
PPUPosition Pick-off Unit
PRPressure
PREDPrediction
PRECIPPrecipitation
PRESSPressure
PREVPrevious
PRIPrimary
PRIMPrimary
PROBProbable / Probably
PROCProcedure / Procedural
PROC TProcedure Turn
PROTProtection
PROFProfile
PROGProgress
PROTProtection
PROXProximity
P/RSTPush To Reset
PRTPrinter
PRVPressure Regulating Valve
P/SPitot/Static
PSIPounds Per Square Inch
PSIGPounds Per Square Inch Gauge
P-SPEEDProfile Speed
PSSPassenger Service system
PSUPassenger Service Unit
PT(S)Point(s)
PT2Engine Inlet Pressure Sensing Probe
PTCPitch Trim Compensator
PTNProcedure Turn
PTHPath
PTRPrinter
PTTPush To Talk
PTUPower Transfer Unit
PVIParavisual Indicator
PWPratt-Whitney
PWRPower

QAQuality Assurance
QARQuick Access Record
QCQuick Change
QECQuick Engine Change
QFELocal Station Barometric Pressure
QNESea Level Standard Atmosphere Pressure
QNHSea Level Atmosphere Pressure
QTQuart (US)
QTRQuarter
QTYQuantity

RRight / Red / Reset
RARadio Altitude
RABSReverse Actuated Bleed System
RADRadial / Radio
RAMRandom Access Memory
RATRam Air Turbine / Ram Air Temperature
RBRight Bank
RBNRadio beacon
RCAReaching Cruise Altitude
RCCBRemote Control Circuit Breaker
RCDRecord
RCDRRecorder
RCLRecall
RCVDReceived
RCVRReceiver
RDMI, RDDMIRadio Distance Magnetic Indicator
RECRecorder
RECIRCRecirculate
REFReference
REFRIGRefrigeration
REGRegulator
RELRelease
REPRepresentative / Repellant
REPLNTRepellant
REQRequired
REQUALRequalifiication
RESReserve
RESIDResidual
RESTRestriction
RESTRRestriction
RESVReserve
RETRetract / Recurrent Emergency Trainng / Return
RETDRetarded
REVReverse
RFRight Front / Refill / Radio Frequency
RFIRadio Frequency Interference
RGSReference Ground Speed
RGTRight
RHRight Hand
R/IRemove/Install
RLSRelease
RLSKRight Line Select Key
RLYRelay
RMIRadio Magnetic Indicator
RMKSRemarks
RMPRadio Management Panel
RNRight Nose
RNAVRadio Navigation
RNGRange
ROCRate of Climb
ROTRotation
RPMRevolutions Per Minute
RPTReport
RPTGReporting
RPUReceiver Processor Unit
RQRDRequired
RQSTRequest
RRRight Rear
RSTReset
RSVReserve(s)
RSVRReservoir
RTReceiver/Transmitter
R/TRequired Time of Arrival
RTCARadio Technical Commission for Aeronautics
RTERoute/Route Data
RTNReturn
RTORejected Takeoff
RUDRudder
RVRRunway Visual Range
RVSRReverser
RWRight Wing / Runway
R/WRunway
RWDRight Wing Down
RWYRunway

SSouth / Stern
SAESociety of Automotive Engineers
SAFSafety
SAIStandby Attidude Indicator
SAOSpecification Assiste par Ordinateur, i.e., Computer Aided Specification
SARSearch And Rescue / Surveillance Approach Radar
SASStability Augmentation System
SATStatic Air Temperature
SATCOMSatellite Communication
SCSingle Chime
S/CStep Climb
SCATANASecurity Control of Air Traffic & Air Navigation Aids
SCHEDSchedule
SDSystem Display
S/DStep Descent
SDACSystem Data Acquisition Concentrator
SDCUSmoke Detection Control Unit
SECSecond / Secondary / Sector
SECSpoiler Elevator Computer (A320)
SELSelect / Selector
SELCALSelective Call
SECLSELCAL
SENSSensitivity
SERV, SVCEService
SETPSociety of Experimental Test Pilots
SFARSpecial Federal Aviation Regulation
SFCCSlat Flap Control Computer
SFESeller Furnished Equipment
SGSymbol Generator
SHFSuper High Frequency 3000 to 30,000mHz)
SISystème International
SICSecond In Command
SIDStandard Instrument Departure
SIGMETSignificant Metorological Advisory
SIMSimulation / Simulator
SISService Interphone System
SLSea level
SLCTDSelected
SLCTRSelector
SLOSlow
SLSTSea Level Static Thrust
SLTSlat
SMARTSignal Monitoring and Retracting Technique system
SMKSmoke
SNGLSingle
SNSStandby Navigation System
S/OSecond Officer
SOPStandard Operating Procedures
SOVShutoff Valve
SPSpeed / Space (spacebar) / Scratch Pad / Special Purpose
SPDSpeed
SPDBRKSpeedbrake
SPD LIMSpeed Limit
SPLRSpoiler
SQLSqulch
SRASpecific Range Air
SRDSoftware Requirements Document
SRSSpeed Reference System
SSSlow Slew
SSBSingle Side Band / Split System Breaker
STAStation
STABStabilizer
STATStatus
STAT INVStatic Inverter
STARStandard Terminal Arrival Route
STBStabilization
STBYStandby
STCSensitivity Time Control / Standard Type Certificate
STDStandard
STGStage
STRSteer / Steering / Stretch(ed)
STRGSteering
STRUCTStructural
STSStatus / System Status
SUPSupply
SUPPLSupplemental
SURFSurface
SW(S)Switch(es)
SWLTSwitchlight
SWTGSwitching
SYSystem
SYN, SYNCHSychronize / Synchronization / Synchronized
SYNCSychronous / Sychronize
SYSSystem
SYSTSystem, Synch

TTurn / True / Total
TATraffic Advisory
TACANTactical Air Navigation
TACHTachometer
TACTTactical
TAFInternational Terminal or Alternate weather Forcast
TAIThermal Anti-Ice
TASTrue Airspeed
TATTotal Air Temperature
TBDTo Be Determined
TCTurbocompressor
T/CTop of Climb
TCASTraffic Alert & Collision Avoidance System
TCCTurbine Case Cooling
TCHThreshold Crossing height
T/DTop of Descent
TDWRTerminal Doppler Weather Radar
TETrailing Edge
TEMPTemperature
TFCTraffic
TFRTransfer
TGTTarget
THTrue Heading
T/HOLDThrottle Hold
THRThrust
THR HOLDThrottle Hold
THROTThrottle
THRSHThreshold
THRUThrough
THSTrimmable Horizontal Stabilizer
TKTank / Track Angle
TKETrack Angle Error
TLAThrust Lever Angle
TLWDTailwind
TMAThrust Mode Annunciator
TMCThrust Management Computer
TMPYTemporary
TMRTimer / Triple Modular Redundancy
TMSThrust Management System
TMSPThrust Mode Select Panel
TO, T/OTakeoff
TOCTop Of Climb
TOGA, TO/GATakeoff/Go Around
TOGWTakeoff Gross Weight
TOLTolerance
TONNESMetric Ton
TOWTakeoff Weight
T/P, TPTurn Point
TPISTire Pressure Indicating System
TRKTrace
TR(S)Transformer Rectifier(s)
T/RThrust Reverser / Transmitter Receiver
TRANSTransition / Transfer
TRANSPTransponder
TROPOTropopause
TRKTrack
TRUTransformer Rectifier Unit
TS, TsStandard Temperature
TT2Engine Inlet Temperature
TTGTime to Go
TTLTotal
TURBTurbine / Turbulence
TURBLTurbulence
TVORTerminal VOR
T/WINDTailwind
T/WXTraffic and Weather Displayed simultaneously (TCAS)

U/DUpper Deck
UFDUnit Fault Data
UHFUltra High Frequency
ULBUnderwater Locator Beacon
UNLKUnlock
UNLKDUnlocked
UNPARLDUnparalleled
UNSCHDUnscheduled
UPGRUpgrade
UPRUpper
USBUpper Side Band
UTCCoordinated Universal Time
UTILUtility
UVUltraviolet radiation

VVolt / Velocity or Speed
V1Critical Engine Failure Speed
V2Take Off Safety Speed
VACVolts Alternating Current
VALValve
VARVariation
VASIVertical Approach Slope Indicator
V/BVertical Bearing
VBVVariable bypass valve
VCRVideo Cassette Recorder
VDCVolts Direct Current
VDPVertical Descent Point
VEFCritical Engine Failure Speed
VELVelocity
VERTVertical
VFEMaximum Velocity Flaps Extended
VFRVisual Flight Rules
VFTOVelocity Final Take-Off (Green Dot)
VGVertical Gyro
VHFVery High Frequency
VHVVery High Voltage
VIBVibration
VIGVVariable Inlet Guide Vanes
VLFVery Low Frequency
VLVValve
VMManeuvering Speed
VMCVisual Meteorlogical Conditions
VMCGMinimum Control Speed Ground
VMINMinimum Operating Speed
VMOMaximum Operating Speed
V NAV, VNAVVertical Navigation
VOLVolume
VOLMETMeteorological information for aircraft in flight
VOLTVoltage
VORVHF Omnidirectional Range
VOR DVOR-DME
VORTACVOR And TACAN Co-Located
VOTVOR Test Facility
VOXVoice
VRRotation Speed
VREFReference Speed
V/SVertical Speed
VSIVertical Speed Indicator
VSVVariable Stator Vane
VTKVertical Track
VTOVolumetric Top Off unit

WWhite / West / Weight
WAIWing Anti Ice
WARNWarning
WAY PTWaypoint
WBCWeight and Balance Computer
W/DWiring Diagram
WGWing
WGDWindshield Guidance Display
WGT, WTWeight
WHCWindow Heat Computer
WHLWheel
WHLSWheels
WPTWaypoint
WSHLDWindshield
WTWeight
WTBWing Tip Brake
WTNGWaiting
WTRWater
W/WWheel Well
WXWeather
WXPWeather Radar Precipitation Mode
WXRWeather Radar
WXTWeather Radar Turbulence Mode
WY PTWay Point

XCross (combining prefix, e.g. X-feed)
X-BLDCross Bleed
X-FEEDCrossfeed
XCVRTransceiver
XFERTransfer
XFRTransfer
XMISSIONTransmission
XMITTransmit
XMTRTransmitter
XPDRTransponder
XPNDRTransponder
XPECTExpect
XTECross Track Error
XTKCross Track / Cross Track Error / Cross Track Distance
XTRKCross-track
X/WINDCrosswind

YYellow
Y/DYaw Damper

ZZulu Time
ZFCGZero Fuel Center of Gravity
ZFWZero Fuel Weight
ZFWCGZero Fule Weight Center of Gravity

V SPEEDS TABLE

VaDesign Maneuvering Speed
VbDesign speed for maximum gust intensity
VcDesign cruising speed
VdDesign diving speed
Vdf/MdfDemonstrated flight diving speed
VfDesign flap speed
Vfc/MfcMaximum speed for stability characteristics
VfeMaximum flaps extended speed
VhMaximum speed in level flight with maximum continuous power
VleMaximum landing gear extended speed
VloMaximum landing gear operating speed
VlofLift-off speed
VmaxMaximum speed
VmbeMaximum brake energy speed
VmcMinimum control speed
VmcaMimimum control speed airborne
VmcgMinimum control speed ground
VminMinimum speed
Vmo MmoMaximum operating limit speed
VmuMinimum unstick speed
VneNever exceed speed
VnoMaximum structural cruising speed
VrRotation speed
VrefReference Speed
VsStalling speed
VsoStalling speed in the landing configuration
Vs1Stalling speed in a specified configuration
VtdTouchdown indicated airspeed
VtossTakeoff safety speed for Category A rotocraft
VxSpeed for best angle of climb
VySpeed for best rate of climb
V1Takeoff decision speed
V2Takeoff safety speed
V2minMinimum takeoff safety speed