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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

AAE	Above Airport Elevation
AAIB	Air Accidents Investigation Branch (UK)
ABM	Abeam
ABN, ABNORM	Abnormal
ABS	Absolute
AC	Alternating Current / Advisory Circular
A/C	Air Conditioning / Aircraft
ACARS	ARINC Communications Addressing and Reporting System
ACCEL	Acceleration, Accelerate(d)
ACFT	Aircraft
ACM	Air Cycle Machine
ACMP	Alternating Current Motor Pump / Electric Hydraulic Pump
ACMS	Aircraft Condition and Monitoring System
ACP	Audio Control Panel
ACPT	Accept
ACRU	Air Conditioning Refrigeration Unit
ACT	Active / Activate
ACU	Antenna Coupler Unit
AD	Airworthness Directive
ADC	Air Data Computer
ADF	Automatic Direction Finder
ADG	Air Driven Generator
ADI	Attitude Director Indicator
ADIRS	Air Data Inertial Reference System
ADIRU	Air Data Inertial Reference Unit
ADJ	Adjusted / Adjustment
ADM	Air Data Module
ADP	Air Driven Pump/Air Driven Demand Hydraulic Pump
ADR	Air Data Reference
ADRS	Address
ADJ	Adjusted / Adjustment
ADV	Advisory / Advance / Advanced
AFCS	Avionic Flight Control System
AFDS	Autopilot Flight Director System
AFE	Above Field Elevation
AFM	Airplane Flight Manual
AFS	Autoflight System / Auto flight Simulator
AFTN	Aeronautical Fixed Telecommunications Network
A/G	Air/Ground
AGL	Above Ground Level
AIAA	American Institute of Aeronautics and Astronautics (US)
AIDS	Aircraft Integrated Data System
AIL	Aileron / Autopilot Interlock
AIP	Aeronautical Information Publication
AIREP	Air Report
AIRMET	weather advisory service
AIU	Audio Interface Unit
AL	Alert
ALPA	Air Line Pilots Association
ALPHA	Angle of Attack for a specific configuration
ALRT	Alert
ALS	Autothrottle Limit Switch
ALT	Altitude
ALT HOLD	Altitude Hold
ALTM	Altimeter
ALTN	Alternate
ALT/S	Altitude Select
ALW	Allowable Landing Weight
AM	Amplitude Modulation
AMB	Ambient
AMBG	Ambiguity
AMP(s)	Ampere(s)
AMR	Auto/Manual/Remote
AMU	Audio Management Unit
AND (A.N.D.)	Aircraft Nose Down
ANNUNC	Annunciator
ANT	Antenna
ANU (A.N.U.)	Aircraft Nose Up
AOA	Angle of Attack
AP (A/P)	Auto-Pilot
APB	Auxiliary Power Breaker
APD	Approach Progress Display
APFD(S)	Autopilot Flight Director (System)
APL	Airplane
APP	Approach
APPR	Approach
APPROX	Approximately
APPU	Asymmetry Position Pick-off Unit
APT	Airport
APU	Auxiliary Power Unit
APX	Appendix
AQP	Advanced Qualifications Program
ARFF	Aircraft Rescue and Fire Fighting
ARINC	Aeronautical Radio Incorporated
ARND	Around
ARPT	Airport
ARRVL	Arrival
ARSR	Air route surveillance radar
ARTCC	Air Route Traffic Control Center
AS	Airspeed / Altitude Mode Switch Monitor
A/S	Airspeed
ASA	Autoland Status Annunciator
ASI	Air Speed Indicator
ASMD	Assumed
ASP	Audio Selector Panel
ASAP	As Soon As Possible
ASR	Airport Surveillance Radar
ASRS	Aviation Safety Reporting System
ASSY	Assembly
ASTP	Advanced Simulation Training Program
ASYM	Assymetrical / Asymmetry
A/S	Airspeed
A/SKID	Anti Skid
A/T	Autothrottle
ATA	Actual Time of Arrival / Air Transport Associaton
ATC	Air Traffic Control
ATCRBS	ATC radar beacon system
ATC/DABS	Air Traffic Control/Discrete Address Beacon System
ATE	Automatic Test Equipment
A/THR	Auto Thrust Function
ATIS	Automatic Terminal Information Service
ATM	Air Turbine Machine
ATS	Auto Thrust System / Autothrottle System
ATT	Attitude
ATTND	Attendant
AUG	Augmentation
AUTO	Automatic
AUX	Auxiliary
A/V	Auto-Visual
AVAIL	Available
AVG	Average
AVM	Airborne Vibration Monitor
AVS	Audio Visual System
AWOS	Automated Weather Observation System
AWY	Airway
AZ	Vertical Acceleration
AZIM	Azimuth
AzMKR	Azimuth Marker

BAL	Balance
BARO	Barometric
BAT	Battery
BB	Broadband
B/B	Back Beam
BC	Back Course
BCDS	Bite Centralized Data System
BCK	Back
BCL	Battery Charge Limiter
BCN	Beacon
B/CRS (B CRS)	Back Course
BEV	Beverage
BF	Boarded Fuel
BFE	Buyer Furnished Equipment
BFO	Beat Frequency Oscillator
BIT	Built In Test
BITE	Built In Test Equipment
BIU	Bite Interface Unit
BK	Brake
BKGRD	Background
BKR	Breaker (Circuit Breaker)
BKS	Brakes
BLD	Bleed
BLK	Block
BMC	Bleed Air Monitoring Computer
BMV	Brake Metering Valve
BNR	Binary
BOD	Bottom of Descent
BRF	Brief(ing)
BRG	Bearing
BRK	Brake
BRKNG	Breaking
BRKR(S)	Breaker(s)
BRT	Bright
BS	British Standard
BSCU	Brake System Control Unit
BAY	Busy
BTB(S)	Bus Tie Breaker(s)
BTC	Bus Tie Contactor
BTL	Bottle
BTR	Bus Tie Relay
BTU	British Thermal Unit
B/U	Backup
BUF	Buffet (as in buffet speed)
BUS	Bus Bar

C	Center
ºC	Degrees Centigrade
CAA	Civil Aviation Authority (UK) / Civil Aeronautics Agency (US)
CAP	Capture
CAPT	Captain
CAS	Calibrated Airspeed
CAT	Clear air turbulence
CB(S), C/B	Circuit Breaker(s)
CBMS	Circuit Breaker Monitoring System
CCA	Central Control Actuator
CCW	Counterclockwise
CDL	Configuration Deviation list
CDU	Control Display Unit
CFDIU	Centralized Fault Data Interface Unit
CFDS	Centralized Fault Display System
CFM	Cubic Feet Per Minute
CG	Center Of Gravity
CHAN	Channel
CHG	Change
CHR	Chronograph
CHRGR	Charger
CIDS	Cabin Intercommunication Data System
CIS	Cabin Interphone System
CK	Check
CKT	Circuit
CLB	Climb
C/L	Check List
CL	Close
CLB	Climb
CLK	Clock
CLR	Clear
CLSD	Closed
CMD	Command
CMPTR	Computer
CNX	Cancelled
CO	Company
COMM	Communication
COMP	Compressor
COMP	Compartment
CON	Continous
COND	Condition
CONF	Configuration
CONFIG	Configuration
CONN	Connection
CONT	Control / Continuous
CORR	Correction
CO RTE	Company Route
CP	Control Panel
CPCS	Cabin Pressure Control System
CPCU	Cabin Pressure Controller Unit
CRC	Continuous Repetitive Chime
CRG	Cargo
CRS	Course
CRT	Cathode Ray Tube
CRZ	Cruise
CSCU	Cargo Smoke Control Unit
CSD	Constant Speed Drive
CSEU	Control System Electronic Unit
CSM/G	Constant Speed Motor/Generator
CSTR	Constraint
CTL PNL	Control Panel
CTR	Contour / Center
CU	Control Unit
CVR	Cockpit Voice Recorder
CVRDA	Cockpit Voice Recorder
CW	Clockwise
CWS	Contorl Wheel Steering

DA	Drift Angle
DAR	Digital AIDS Recorder
DC	Direct Current
DCV	Directional Control Valve
DDRMI	Digital distance and Radio Magnetic Indicator
DECEL	Decelerate(d)
DECR	Decrease
DED	Dedicated
DEG	Degree
DEM	Demand
DEPR	Depressurize
DEPT	Departure
DER	Designated Engineering Representative
DES	Descent
DEST	Destination
DET	Detector
DFA	Delayed Flap Approach
DEV	Deviation
DFDAU	Digital Flight Data Acquisition Unit
DFDR	Digital Flight Data Recorder
DGAC	Direction Générale de l'Aviation Civile
DH	Decision Height
DIFF	Differential
DIR	Direct / Direction
DIR TO	Direct To
DISC	Disconnect
DISCH	Discharge
DISCONT	Discontinued
DISP	Dispatch
DIST	Distance
DITS	Digital Information Transfer System
DK	Deck
DMC	Display Management Computer
DME	Distance Measuring Equipment
DMU	Data Management Unit (Aids)
DN	Down
DNTKFX	Down Track Fix
DR	Dead reckoning / Door
DSDL	Dedicated Serial Data Link
DSPL	Display
DTG	Distance To Go
DU	Display Unit

E	East
EADI	Electronic Attitude Director Indicator
EAS	Equivalent Airspeed
EBU	Engine Build-Up
ECAM	Electronic Centralized Aircraft Monitoring Computer / Electronic Control and Maintenance display
ECB	Electronic Control Box (APU)
ECM	Engine Condition Monitoring
ECON	Economic
ECP	ECAM Control Panel
ECS	Environmental Control System
ECU	Engine Control Unit
E/D	End of Descent
EDP	Engine Driven Pump / Engine Primary Hydraulic Pump
E/E	Electrical / Electronic
EEC	Electronic Engine Control
EEL	Emergency Exit Lights / Emergency Escape Path Lighting
EET	Estimated Elapsed Time
EFC	Expect Further Clearance
EFCS	Electronic Flight Control System
EFI	Electronic Fligh Instruments
EFIS	Electronic Flight Instrument System
EFOB	Estimated Fuel On Board
EGT	Exhaust Gas Temperature
EHF	Extremely high frequency
EHSI	Electronic Horizontal Situation Indicator
EICAS	Engine Indication and Crew Alerting System
EIS	Electronic Instruments System
EIU	Engine Interface Unit
EL	Elevator
ELAC	Elevator Aileron Computer
ELCU	Electrical Load Control Unit
ELEC	Electrical / Electrics
ELEV	Elevator
ELF	Extremely low frequency
ELV	Elevation
EMER	Emergency
EMER GEN	Emergency Generator
EMI	Electro-Magnetic Interference
ENG	Engine
ENRT	Enroute
ENT	Enter
ENTMT	Entertainment
ENTR	Enter
EO, E/O	Engine Out
EPE	Estimated Position Error
EPI	Elevator Position Indicator
EPR	Engine Pressure Ratio
EPRL	EPR Limit
EQPT	Equipment
EQUIV	Equivalent
ER	Extended Range
EROPS	Extended Range Operatations
ERR	Error
ESS	Essential
EST	Estimated
ET	Elapsed Time
ETA	Estimated Time of Arrival
ETE	Estimated Time en Route
ETOPS	Extended-Range Twin Engine Operations
ETP	Equal Time Point
ETT	Estimated Takeoff Time
EUROCAE	European Organization for Civil Aviation Electronics
EVAC	Evacuation
EVMU	Engine Vibration Monitoring Unit
E/WD	Engine / Warning Display
EXCD	Exceedances
EXEC	Execute
EXH	Exhaust
EXPED	Expedite
EXT	Extend(ed) / Extension / Exterior / External
EXTEN	Extension
EXT PWR	External Power

F, Fº	Farenheit Degrees
F/A	Flight Attendant
FAA	Federal Aviation Administration
FAC	Flight Augmentation Computer
FACTR	Factor
FADEC	Full Authority Digital Engine Control System
FAF	Final Approach Fix
FANS	Future Air Navigation System
FAR	Federal Aviation Regulation(s)
FAV	Fan Air Valve
FBW	Fly-by-wire.
F/C	Flight Crew
FCC	Flight Control Computer / Federal Communications Commission
FCDC	Flight Control Data Concentrator
FCST	Forecast
FCU	Flight Control Unit
FD, F/D	Flight Director
FDAU	Flight Data Acquisition Unit
FDIU	Flight Data Interface Unit
FDR	Flight Data Recorder
FDU	Fire Detection Unit
FE	Flight Engineer
FF, F/F	Fuel Flow
FFRATS	Full Flight Regime Autothrottle System
FG	Flight Guidance
FGC	Flight Guidance Computer
FGS	Flight Guidance System
FH	Flight Handbook
FIDDS	Fault Isolation and Detection Display System
FIDS	Fault Isolation and Detection System
FILT	Filter
FIRM	Fault Isolation Reporting Manual
FL	Flight Level
FLCH, FL CH	Flight Level Change
FLIFO	Flight Information
FLP	Flap
FLT	Flight
FLT CTL	Flight Control
FM	Flight Management / Frequency modulation
FMA	Flight Mode Annunciator
FMC	Flight Management Computer
FMCS	Flight Management Computer System
FMECA	Failure Modes Effects and Criticality Analysis
FMGC	Flight Management Guidance Computer
FMGS	Flight Management Guidance System
FMS	Flight Management System
FMU	Fuel Metering Unit
FO	Flyover
F/O	First Officer
FOB	Fuel on Board
FOD	Foreign Object Damage
FOG	Fiber Optics Gyro
FOM	Flight Operations Manual
FOTM	Flight Operations Training Manual
F-PLN	Flight Plan
FPA	Flight Path Angle
FPL	Flight Plan
FPM	Feet Per Minute
FPPU	Feed-Back Position Pick-Off Unit
FPS	Flight Per Second
FPT	Flight Plan Time
FPV	Flight Path Vector
FQ	Fuel Quanity
FQI/FQU	Fuel Quantity Indication / Unit
FR	From
FREQ	Frequency
FRM	Falut Reporting Manual
FRT	Front
FRV	Fuel Return Valve
FS	Flight Safety / Fast Slew
F/S	Fast/Slow (indicator)
FSEU	Flap/Slat Electronic Unit
FSF	Flight Safety Foundation
FSS	Flight Service Station
FT	Foot Feet.
FTA	Fault Tree Analysis
FTM	Flight Training Manual
FT/MN	Feet per Minute
FU	Fuel Used
FWD	Forward
FWC	Flight Warning Computer
FWS	Flight Warning System

G	Gravity (G-Force) / Gyro (flag on ADI)
G/A	Go Around
GA	Go Around
GB	Generator Breaker
GCA	Ground Controlled Approach
GCR	Generator Control Relay
GCU	Generator Control Unit
GE	Genral Electric
GEN	Generator
GFR	Generator Field Relay
GLC	Generator Line Contractor
GLY	Galley
GMT	Greenwich Mean Time
GND	Ground
GP	General Purpose
GPCU	Ground Power Control Unit
GPH	Gallons Per Hour
GPM	Gallons Per Minute
GPS	Global Positioning System (Navstar)
GPU	Ground Power Unit
GPWS	Ground Proximity Warning System
GR	Gear / Generator Relay
GRD	Ground
GRND	Ground
GRP	Geographic Reference Point
GRVTY	Gravity
GS	Ground Speed
G/S	Glide Slope
GSE	Ground support equipment
GTOW	Gross Takeoff Weight
GW	Gross Weight

H	Hour, Hot
HA	Halon fire extenguisher
HCU	Hydraulic Control Unit
HDBK	Handbook
HDG	Heading
HDG/S	Heading Select
HDL	Handle
HDWD	Headwind
HF	High Frequency
HG	Heading
HI	High
HIRF	High Intensity Radiated Field
HLD	Hold / Holding
HMG	Hydraulic Motor Generator
HMU	Hydro-Mechanical Unit
HOL	High-Order Language
HOT	High Oil Temperature
HP	High Pressure
HPA	Hectopascals
HPV	High Pressure Valve
HR	Hour
HSI	Horizontal Situation Indicator
HT	Height / Heat
HTR	Heater
HUD	Head Up Display
HUMID	Humidifier
H/Wind	Headwind
HYD	Hydraulics
HZ	Hertz (cycles per second in alternating current)

IAF	Initial Approach Fix
IAS	Indicated Airspeed
IATA	International Air Transport Association
IAW	In Accordance With
I/C	Inspection/Check
ICAO	International Civil Aviation Organization
ICU	Instrument Comparator Unit / Indicator Control Unit
IDENT	Identification
IDG	Integrated Drive Generator
IDS	Integrated Display System
IDU	Interactive Display Unit
I.E.	That Is
IFR	Instrument Flight Rules
IGN	Ignition
ILLUM	Illuminate / Illuminated
ILS	Instrument Landing System
IMBAL	Imbalance
IMC	Instrument Meterorological Conditions
IMM	Immediate
IMP	Imperial
IN	Inch(es)
INB	Inbound
INBD	Inboard
INBO	Inboard
INBRD	Inboard
INC	Incorporated
INCR	Increase
INCREM	Increment
IND	Indicator
INFLT	Inflight
INHB	Inhibit
INIT	Initialization / Initialize
INOP	Inoperative
INPH	Interphone
INR	Inner
INS	Inertial Reference System
INST(S)	Instrument(s)
INSTR	Instrument
INT	Interphone / Initialization / Intensity
INTC	Intercept
INTCP	Intercept
INTPH	Interphone
INV	Inverter
I/O	Input/Output
IOE	Initial Operating Experience
IP	Intermediate Pressure/Input/Intercept Profile/Initial Point
IPC	Intermediate Pressure Check valve
IPPU	Instrumentation Position Pick-off Unit
IR	Infrared / Infrared Radiation
IRS	Inertial Reference System
IRU	Inertial Reference Unit
ISA	International Standard Atmosphere
ISB	Inter-System Bus
ISDU	Inertial Sensor Display Unit
ISLN	Isolation
ISOL	Isolate / Isolated / Isolation (valve)
IVSI	Instantaneous Vertical Speed Indicator
IV&V	Independent Validation and Verification

JAA	Joint Aviation Authorities
JAR	Joint Aviation Regulations
JEPP	Jeppeson
JETT	Jettison
JP(4), (5)	Military Jet Fuel

K,KT,KTS	Knots
KEAS	Knots Equivalent Airspeed
KG(S)	Kilograms(s)
KHZ	Kilohertz
KIAS	Knots Indicated Airspeed
KIFIS	Kollsman Integrated Flight Instrument System
KIAS	Knots Indicated Airspeed
KT	Knot
KTAS	Knots True Airspeed
KVA	Kilovolt-Ampere
KVAR	Kilovolt-Ampere Reactive
KW(S)	Kilowatt(s)

L	Left
LAF	Load Alleviation Function
LAND	Autoland mode annunciation
LAT	Latitude, Lateral
LAT REV	Lateral Revision
LAV	Lavatory
LB(S)	Pound(s) / Left Bank
LBA	Luftfahrt Bundesamt
LCA	Line Check Airman
LCD	Liquid Crystal Display
LCN	Load Classification Number
LD	Load; a unitized cargo loading container, ie LD-3
LDA	Localizer type approach
LDG	Landing
LDG GR	Landing Gear
LDOC	Long Distance Operational Control
LE	Leading Edge
LEC	Lecture
LED	Light Emitting Diode
LF	Low Frequency / Left Front
LFT	Left
LG, L/G	Landing Gear
LGCIU	Landing Gear Control Interface Unit
LGPIU	Landing Gear Position Indicating Unit
LGT	Light
LGW	Landing Gross Weight
LH	Left Hand
LIM	Limit / Limitation
LIS	Localizer Inertial Smoothing
LK	Lock
LKD	Locked
LL	Latitude / longitude
LLG	Lower Lobe Galley
LLS, LLSK	Left Line Select Key
LLWAS	Low Level Wind Shear Alerting System
LM	Low Minimums
LMM	Locator Middle Marker
LMR	Load Monitor Relay
L NAV, LNAV	Lateral Navigation
LNDG	Landing
LO	Low
LOC	Localizer
LOFT	Line Oriented Flight Trainng
LOGO	Logographic
LOM	Locator Outer Marker
LONG	Lontitude
LOP	Line Of Position / Low Oil Pressure
LORAN	Long Range Navigation
LOS	Loss of Signal / Line Oriented Simulation
LN	Left Nose
LP	Low Pressure
LPM	Liter Per Minute
LR	Left Rear
LRC	Long Range Cruise
LRRA	Low Range Radio Altimeter
LRU	Line Replacable Unit
LS	Line Select
L&S	Limits and Specifications
LSB	Lower Side Band
LSK	Line Select Key
LSP	Limit Select Panel
LSU	Lavatory Service Unit
LT(S)	Light(s) / Left
LVL	Level
LVL/CH	Level Change
LW	Left Wing / Landing Weight
LWD	Left Wing Down
LWR	Lower

M	Mach / Machine / Meter / Magenta
MAC	Mean Aerodynamic Chord / Military Airlift Command
M.A.C.	Mean Aeordynamic Chord
MAG	Magnetic
MAG DEC	Magnetic Declination
MAG VAR	Magnetic Variation
MAINT	Maintenance
MALF	Malfunction
MAN	Manual / Manifold
MANFLD	Manifold
MAP	Missed Approach Point
M/AS, MAS	Mach Airspeed
MASI	Mach Airspeed Indicator
MAX	Maximum
MAX CLB	Maximum Climb
MAX DES	Maximum Descent
MAX END	Maximum endurance
MB	Millibar(s)
MCA	Minimum Crossing Altitude
MCDP	Mantenance Control and Display Panel
MCDU	Multifunction Control and Display Unit
MCP	Mode Control Panel
MCT	Maximum Continuous Thrust
MCU	Modular Concept Unit
MCW	Maximum Cruise Weight
MDA	Minimum Descent Altitude
MDH	Minimum Descent Height
MDLF	Minimum Desired Landing Fuel
MEA	Minimum Enroute Altitude
MEC	Main Engine Control
MECH	Mechanic / Mechanical
MED	Medium
MEL	Minimum Equipment List
MEM	Memory
MESC	Mid Electronic Service Center
MEW	ManufactureÕs Empty Weight
MF	Medium Freqency
MFA	Memorized Fault Annunciator
MGMT	Management
MGT	Management
MHZ	Megahertz
MI	Miles
MIC	Microphone
MID	Middle
MIKE	Microphone
MIN	Minimum
MISC	Miscellaneous
MKR	Marker / Range Marks
MLG	Main Landing Gear
MLS	Microwave Landing System
MLW	Maximum Landing Weight
MM	Middle Marker
MMEL	Master Minimum Equipment List
MMO	Maximum Mach Operating Speed
MN	Main / Mach Number / Minute
MOCA	Minimum Obstruction (Obstacle) Clearance Altitude
MOD	Module / Modification
MOM	Momentary Contact
MON	Monitor
MONITR	Monitor
MPH	Miles Per Hour
MPM	Miles Per Minute
MRA	Minimum Reception Altitude
MRC	Maximum Range Cruise
MRIU	Maintenance and Recording Interface Unit
MRM	Maintenance Reporting Manual
MSA	Minimum Safe Altitude
MSG	Message
MSL	Mean Sea Level
MSU	Mode Select Unit
M-SPD	Manual Speed
MSU	Mode Selector Unit
MTBF	Mean Time Between Failure
MTCE	Maintenance
MTG	Miles To Go
MTNCE	Maintenance
MTOGW	Maximum Takeoff Gross Weight
MTOW	Maximum Takeoff Weight
MTRS	Meters
MTW	Maximum Taxi Weight
MU	Management Unit
MUX	Multiplexer / Multiplex
MZ	Melt Zone (Fuse Plug)
MZFW	Maximum Zero Fuel Weight

N	North / Nose / Normal
N	APU or Engine RPM (%)
N1	Low Pressure Compressor
N2	High / Intermediate Pressure Compressor
N3	High Pressure Compressor
N/A, (NA)	Not Applicable
NAC	Nacelle
NACA	National Advisory Committee for Aeronautics
NAI	Nacelle Anti Ice
NAM	Nautical Air Miles
NASA	National Aeronautics and Space Administration
NAV	Navigation
NAVAID	Navigation Aid
NB	Non-directional Radio Beacon
ND	Navigation Display
NDB	Non-directional Radio Beacon / Nav Database
NEG	Negative
NEUT	Neutral
NEG	Negative
NFO	Non Fly Over
NGM	Nautical Ground Miles
NLG	Nose Landing Gear
NM	Nautical Mile(s)
NO.	Number
NOCOM	No Communications
NORM	Normal
NoPT	No Procedure Turn
NORDO	No Radio
NORM	Normal
NOTAM	Notice to Airmen
NOZZ	Nozzle
NTSB	National Transportation Safety Board
NW	Nose Wheel
NWS	Nose Wheel Steering
NXT	Next

O2	Oxygen
OAT	Outside Air Temperature
OBRM	On Board Replacement Module
OBS	Observer
OCA	Oceanic Control Area / Obstacle Clearance Altitude
OEW	Operating Empty Weight
OFF/R	Off Reset
OFST	Offset
OGW	Operating Gross Weight
OHT	Overheat
OK	Okay
OM	Outer Marker
OMC	Observer Member of the Crew
OMNI	Omnidirectional Navigation Radio
ONS	Omega Navigation System
OP	Open / Operating
O/P	Output
OPM	Operating Performance Manual
OPP	Opposite
OPR	Operate
OPRN	Operation
OPT	Optimum
ORIDE	Override
OUTB	Outbound
OUTBD, OUTBRD	Outboard
OUTR	Outer
OVBD	Overboard
OVHD	Overhead
OVHT, OH	Overheat
OVRD	Override
OVRDN	Overridden
OVSPD	Overspeed
OW, O/W	Overwater
OWE	Operating Empty Weight
OXY	Oxygen

P	Panel
PA	Passenger Address
PAC	Pilot at Controls / Pack (airconditioning)
PACK	Airconditioning Package
PAM	Pulse amplitude modulation
PAPR	Paper
PAR	Precision approach radar
PASS	Passenger
PAX	Passengers
PB	Pushbutton
PBE	Protective Breathing Equipment
PCA	Power Control Actuator
PCIP	Precipitation
PCU	Power Control Unit
P-DES	Profile Descent
PDI	Pictorial Deviation Indicator
PDS	Primary Diversion Station
PDU	Pilot Display Unit / Power Drive Unit
PED	Pedestal
PEND	Pendant
PE/PS	Passenger Entertainment/Passenger Service System
PERF	Performance
PERS	Personnel
PES	Passenger Entertainment System / Pitch Enhancement System
PF	Pilot Flying
PFC	Porous Friction Course Overlay (runway Surface)
PFCS	Primary Flight Control System
PFD	Primary Flight Display
PFM	Pulse frequency modulation / Pure Flipping Magic
PHC	Probe Heat Computer
PIC	Pilot In Command
PK	Park
PKS	Packs
PL	Payload
PLAN	EFIS Mode
PLI	Pitch Limit Indicator
PLNG	Planning
PLS	Pitch Limit Symbol
PLT(S)	Pilot(s)
PM	Phase modulation / Afternoon
PMA	Permanent Magnet Alternator
PMC	Power Management Control
PMG	Permanent Magent Generator
PMP	Pump
PMS	Performance Managememt System
PNEU	Pneumatic
PNF	Pilot Not Flying
PNL	Panel
PNR	Point of No Return
PO	Outside Air Pressure
POB	Pressure Off Brake
POD	Point of Descent
POI	Principal Operations Inspector
POS	Position / Positive
POVMC	Planned to Operate in Visual Meteorological Conditions
PPH	Pounds Per Hour
PPOS	Present Position
PPU	Position Pick-off Unit
PR	Pressure
PRED	Prediction
PRECIP	Precipitation
PRESS	Pressure
PREV	Previous
PRI	Primary
PRIM	Primary
PROB	Probable / Probably
PROC	Procedure / Procedural
PROC T	Procedure Turn
PROT	Protection
PROF	Profile
PROG	Progress
PROT	Protection
PROX	Proximity
P/RST	Push To Reset
PRT	Printer
PRV	Pressure Regulating Valve
P/S	Pitot/Static
PSI	Pounds Per Square Inch
PSIG	Pounds Per Square Inch Gauge
P-SPEED	Profile Speed
PSS	Passenger Service system
PSU	Passenger Service Unit
PT(S)	Point(s)
PT2	Engine Inlet Pressure Sensing Probe
PTC	Pitch Trim Compensator
PTN	Procedure Turn
PTH	Path
PTR	Printer
PTT	Push To Talk
PTU	Power Transfer Unit
PVI	Paravisual Indicator
PW	Pratt-Whitney
PWR	Power

QA	Quality Assurance
QAR	Quick Access Record
QC	Quick Change
QEC	Quick Engine Change
QFE	Local Station Barometric Pressure
QNE	Sea Level Standard Atmosphere Pressure
QNH	Sea Level Atmosphere Pressure
QT	Quart (US)
QTR	Quarter
QTY	Quantity

R	Right / Red / Reset
RA	Radio Altitude
RABS	Reverse Actuated Bleed System
RAD	Radial / Radio
RAM	Random Access Memory
RAT	Ram Air Turbine / Ram Air Temperature
RB	Right Bank
RBN	Radio beacon
RCA	Reaching Cruise Altitude
RCCB	Remote Control Circuit Breaker
RCD	Record
RCDR	Recorder
RCL	Recall
RCVD	Received
RCVR	Receiver
RDMI, RDDMI	Radio Distance Magnetic Indicator
REC	Recorder
RECIRC	Recirculate
REF	Reference
REFRIG	Refrigeration
REG	Regulator
REL	Release
REP	Representative / Repellant
REPLNT	Repellant
REQ	Required
REQUAL	Requalifiication
RES	Reserve
RESID	Residual
REST	Restriction
RESTR	Restriction
RESV	Reserve
RET	Retract / Recurrent Emergency Trainng / Return
RETD	Retarded
REV	Reverse
RF	Right Front / Refill / Radio Frequency
RFI	Radio Frequency Interference
RGS	Reference Ground Speed
RGT	Right
RH	Right Hand
R/I	Remove/Install
RLS	Release
RLSK	Right Line Select Key
RLY	Relay
RMI	Radio Magnetic Indicator
RMKS	Remarks
RMP	Radio Management Panel
RN	Right Nose
RNAV	Radio Navigation
RNG	Range
ROC	Rate of Climb
ROT	Rotation
RPM	Revolutions Per Minute
RPT	Report
RPTG	Reporting
RPU	Receiver Processor Unit
RQRD	Required
RQST	Request
RR	Right Rear
RST	Reset
RSV	Reserve(s)
RSVR	Reservoir
RT	Receiver/Transmitter
R/T	Required Time of Arrival
RTCA	Radio Technical Commission for Aeronautics
RTE	Route/Route Data
RTN	Return
RTO	Rejected Takeoff
RUD	Rudder
RVR	Runway Visual Range
RVSR	Reverser
RW	Right Wing / Runway
R/W	Runway
RWD	Right Wing Down
RWY	Runway

S	South / Stern
SAE	Society of Automotive Engineers
SAF	Safety
SAI	Standby Attidude Indicator
SAO	Specification Assiste par Ordinateur, i.e., Computer Aided Specification
SAR	Search And Rescue / Surveillance Approach Radar
SAS	Stability Augmentation System
SAT	Static Air Temperature
SATCOM	Satellite Communication
SC	Single Chime
S/C	Step Climb
SCATANA	Security Control of Air Traffic & Air Navigation Aids
SCHED	Schedule
SD	System Display
S/D	Step Descent
SDAC	System Data Acquisition Concentrator
SDCU	Smoke Detection Control Unit
SEC	Second / Secondary / Sector
SEC	Spoiler Elevator Computer (A320)
SEL	Select / Selector
SELCAL	Selective Call
SECL	SELCAL
SENS	Sensitivity
SERV, SVCE	Service
SETP	Society of Experimental Test Pilots
SFAR	Special Federal Aviation Regulation
SFCC	Slat Flap Control Computer
SFE	Seller Furnished Equipment
SG	Symbol Generator
SHF	Super High Frequency 3000 to 30,000mHz)
SI	Système International
SIC	Second In Command
SID	Standard Instrument Departure
SIGMET	Significant Metorological Advisory
SIM	Simulation / Simulator
SIS	Service Interphone System
SL	Sea level
SLCTD	Selected
SLCTR	Selector
SLO	Slow
SLST	Sea Level Static Thrust
SLT	Slat
SMART	Signal Monitoring and Retracting Technique system
SMK	Smoke
SNGL	Single
SNS	Standby Navigation System
S/O	Second Officer
SOP	Standard Operating Procedures
SOV	Shutoff Valve
SP	Speed / Space (spacebar) / Scratch Pad / Special Purpose
SPD	Speed
SPDBRK	Speedbrake
SPD LIM	Speed Limit
SPLR	Spoiler
SQL	Squlch
SRA	Specific Range Air
SRD	Software Requirements Document
SRS	Speed Reference System
SS	Slow Slew
SSB	Single Side Band / Split System Breaker
STA	Station
STAB	Stabilizer
STAT	Status
STAT INV	Static Inverter
STAR	Standard Terminal Arrival Route
STB	Stabilization
STBY	Standby
STC	Sensitivity Time Control / Standard Type Certificate
STD	Standard
STG	Stage
STR	Steer / Steering / Stretch(ed)
STRG	Steering
STRUCT	Structural
STS	Status / System Status
SUP	Supply
SUPPL	Supplemental
SURF	Surface
SW(S)	Switch(es)
SWLT	Switchlight
SWTG	Switching
SY	System
SYN, SYNCH	Sychronize / Synchronization / Synchronized
SYNC	Sychronous / Sychronize
SYS	System
SYST	System, Synch

T	Turn / True / Total
TA	Traffic Advisory
TACAN	Tactical Air Navigation
TACH	Tachometer
TACT	Tactical
TAF	International Terminal or Alternate weather Forcast
TAI	Thermal Anti-Ice
TAS	True Airspeed
TAT	Total Air Temperature
TBD	To Be Determined
TC	Turbocompressor
T/C	Top of Climb
TCAS	Traffic Alert & Collision Avoidance System
TCC	Turbine Case Cooling
TCH	Threshold Crossing height
T/D	Top of Descent
TDWR	Terminal Doppler Weather Radar
TE	Trailing Edge
TEMP	Temperature
TFC	Traffic
TFR	Transfer
TGT	Target
TH	True Heading
T/HOLD	Throttle Hold
THR	Thrust
THR HOLD	Throttle Hold
THROT	Throttle
THRSH	Threshold
THRU	Through
THS	Trimmable Horizontal Stabilizer
TK	Tank / Track Angle
TKE	Track Angle Error
TLA	Thrust Lever Angle
TLWD	Tailwind
TMA	Thrust Mode Annunciator
TMC	Thrust Management Computer
TMPY	Temporary
TMR	Timer / Triple Modular Redundancy
TMS	Thrust Management System
TMSP	Thrust Mode Select Panel
TO, T/O	Takeoff
TOC	Top Of Climb
TOGA, TO/GA	Takeoff/Go Around
TOGW	Takeoff Gross Weight
TOL	Tolerance
TONNES	Metric Ton
TOW	Takeoff Weight
T/P, TP	Turn Point
TPIS	Tire Pressure Indicating System
TRK	Trace
TR(S)	Transformer Rectifier(s)
T/R	Thrust Reverser / Transmitter Receiver
TRANS	Transition / Transfer
TRANSP	Transponder
TROPO	Tropopause
TRK	Track
TRU	Transformer Rectifier Unit
TS, Ts	Standard Temperature
TT2	Engine Inlet Temperature
TTG	Time to Go
TTL	Total
TURB	Turbine / Turbulence
TURBL	Turbulence
TVOR	Terminal VOR
T/WIND	Tailwind
T/WX	Traffic and Weather Displayed simultaneously (TCAS)

U/D	Upper Deck
UFD	Unit Fault Data
UHF	Ultra High Frequency
ULB	Underwater Locator Beacon
UNLK	Unlock
UNLKD	Unlocked
UNPARLD	Unparalleled
UNSCHD	Unscheduled
UPGR	Upgrade
UPR	Upper
USB	Upper Side Band
UTC	Coordinated Universal Time
UTIL	Utility
UV	Ultraviolet radiation

V	Volt / Velocity or Speed
V1	Critical Engine Failure Speed
V2	Take Off Safety Speed
VAC	Volts Alternating Current
VAL	Valve
VAR	Variation
VASI	Vertical Approach Slope Indicator
V/B	Vertical Bearing
VBV	Variable bypass valve
VCR	Video Cassette Recorder
VDC	Volts Direct Current
VDP	Vertical Descent Point
VEF	Critical Engine Failure Speed
VEL	Velocity
VERT	Vertical
VFE	Maximum Velocity Flaps Extended
VFR	Visual Flight Rules
VFTO	Velocity Final Take-Off (Green Dot)
VG	Vertical Gyro
VHF	Very High Frequency
VHV	Very High Voltage
VIB	Vibration
VIGV	Variable Inlet Guide Vanes
VLF	Very Low Frequency
VLV	Valve
VM	Maneuvering Speed
VMC	Visual Meteorlogical Conditions
VMCG	Minimum Control Speed Ground
VMIN	Minimum Operating Speed
VMO	Maximum Operating Speed
V NAV, VNAV	Vertical Navigation
VOL	Volume
VOLMET	Meteorological information for aircraft in flight
VOLT	Voltage
VOR	VHF Omnidirectional Range
VOR D	VOR-DME
VORTAC	VOR And TACAN Co-Located
VOT	VOR Test Facility
VOX	Voice
VR	Rotation Speed
VREF	Reference Speed
V/S	Vertical Speed
VSI	Vertical Speed Indicator
VSV	Variable Stator Vane
VTK	Vertical Track
VTO	Volumetric Top Off unit

W	White / West / Weight
WAI	Wing Anti Ice
WARN	Warning
WAY PT	Waypoint
WBC	Weight and Balance Computer
W/D	Wiring Diagram
WG	Wing
WGD	Windshield Guidance Display
WGT, WT	Weight
WHC	Window Heat Computer
WHL	Wheel
WHLS	Wheels
WPT	Waypoint
WSHLD	Windshield
WT	Weight
WTB	Wing Tip Brake
WTNG	Waiting
WTR	Water
W/W	Wheel Well
WX	Weather
WXP	Weather Radar Precipitation Mode
WXR	Weather Radar
WXT	Weather Radar Turbulence Mode
WY PT	Way Point

X	Cross (combining prefix, e.g. X-feed)
X-BLD	Cross Bleed
X-FEED	Crossfeed
XCVR	Transceiver
XFER	Transfer
XFR	Transfer
XMISSION	Transmission
XMIT	Transmit
XMTR	Transmitter
XPDR	Transponder
XPNDR	Transponder
XPECT	Expect
XTE	Cross Track Error
XTK	Cross Track / Cross Track Error / Cross Track Distance
XTRK	Cross-track
X/WIND	Crosswind

Y	Yellow
Y/D	Yaw Damper

Z	Zulu Time
ZFCG	Zero Fuel Center of Gravity
ZFW	Zero Fuel Weight
ZFWCG	Zero Fule Weight Center of Gravity

V SPEEDS TABLE
Va	Design Maneuvering Speed
Vb	Design speed for maximum gust intensity
Vc	Design cruising speed
Vd	Design diving speed
Vdf/Mdf	Demonstrated flight diving speed
Vf	Design flap speed
Vfc/Mfc	Maximum speed for stability characteristics
Vfe	Maximum flaps extended speed
Vh	Maximum speed in level flight with maximum continuous power
Vle	Maximum landing gear extended speed
Vlo	Maximum landing gear operating speed
Vlof	Lift-off speed
Vmax	Maximum speed
Vmbe	Maximum brake energy speed
Vmc	Minimum control speed
Vmca	Mimimum control speed airborne
Vmcg	Minimum control speed ground
Vmin	Minimum speed
Vmo Mmo	Maximum operating limit speed
Vmu	Minimum unstick speed
Vne	Never exceed speed
Vno	Maximum structural cruising speed
Vr	Rotation speed
Vref	Reference Speed
Vs	Stalling speed
Vso	Stalling speed in the landing configuration
Vs1	Stalling speed in a specified configuration
Vtd	Touchdown indicated airspeed
Vtoss	Takeoff safety speed for Category A rotocraft
Vx	Speed for best angle of climb
Vy	Speed for best rate of climb
V1	Takeoff decision speed
V2	Takeoff safety speed
V2min	Minimum takeoff safety speed