The following list of Aviation Acronyms are the most common in the aviation industry. Please select the first letter of the word from the list above to jump to appropriate section of the glossary.

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

- A -

Aviation Acronym	Description
A/C / ACFT	Aircraft
A/P	Autopilot
A/T	Auto Throttle
AAPS	Atmospheric Absolute Pressure Sensor
AC	Alternating Current
ACC	Air Conditioning Controller
ACCEL	Accelerometer(s)
ACCESS	Accessory
ACCUM	Accumulator
ACM	Air Cycle Machine
ACP	Audio Control Panel
ADF	Automatic Direction Finder
ADI	Alttitude Display Indicator
ADM	Air Data Module
ADS	Air Data System
AEDO	Aircraft Engineering District Office (FAA)
AEG	Aircraft Evaluation Group (FAA)
AFC	Automatic Frequency Control
AFCS	Automated Flight Control System
AFGCS	Automatic Flight Guidance and Control System
AFIS	Airborne Flight Information System
AFM	Aircraft Flight Manual
AGC	Automatic Gain Control
AGL	Above Ground Level
AGM	Advanced Graphics Module
AH	Artificial Horizon
AHDG	Alternate Heading
AHRS	Attitude Heading Reference System
AHRU	Attitude Heading Reference Unit
AHTMS	Aircraft Health & Trend Monitoring
AI	Anti-Icing
AIL	Aileron
AIOP	Actuator Input Output Processor
AIU	Audio Interface Units
ALI	Airworthiness Limitation Items
ALN	Align
ALRT	Alert
ALT	Alternate
ALT	Alternate, Altitude, Altimeter or Alternator
ALTM	Altimeter
ALTNR	Alternator
AM	Amplitude Modulation
AMM	Aircraft Maintenance Manual
AMN	Advanced Material Notice
AMP / Amp / amp	Ampere
AN	Air Force-Navy Aeronautical Standard
ANN	Annunciator
ANNUN	Annunciator
ANP	Annunciator Panel
ANSI	American National Standards Institute
ANT	Antenna
AOA	Angle of Attack
AOG	Aircraft on Ground
AP	Autopilot
APE	Autopilot Engage
API	Angle Position Indicator
APM	Aircraft Personality Unit
APP	Approach
APPT	Approach Track
APR	Approach or Automatic Power Restoration
APS	Altitude Pre-select
APU	Auxillary Power Unit
AQL	Acceptance Quality Level
ARINC	Aeronautical Radio Incorporated
ARL	Automatic Range Limiting
ARM	Armed
ARN	Airborne Radio Navigation
ARSA	Airport Radar Service Area
ARTU	Airborne Radio Telephone Unit
AS	Airspeed
ASC	Aircraft Service Change
ASCB	Avionics Standard Communication Bus
ASCII	American Standard Code for Information Interchange
ASI	Aviation Safety Inspector (FAA)
ASL	Above Sea Level
ASSY	Assembly
AT	Antenna
ATA	Air Transport Association of America
ATC	Air Traffic Control
ATC	Air Traffic Controller Transponder
ATG	Aural(Audio) Tone Generator
ATIS	Automatic Terminal Information Service
ATP	Acceptance Test Procedures
ATS	Air Turbine Starter
ATT	Attitude or Attitude Mode
AUTO	Automatic
AUX	Auxiliary
AZ	Azimuth

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- B -

Aviation Acronym	Description
B/A	Bank Angle
B/CU	Battery/Charger Unit
BAC	Bleed Air Control
BAG / BAGG	Baggage
BARO	Barometric
BARO CORR	Barometer Correction
BATT / BATTS	Battery / Batteries
BBW	Brake-By-Wire
BC	Bus Controller, Back Course
BCD	Binary-Coded Decimal
BCN	Beacon
BCP	Best Computed Position
BCS	Brake Control System
BCU	Brake Control Unit
BCU	Bus Coupler Unit
BD429	Bi-Directional Arinc 429
BDI	Bearing Distance Indicator
BEER	Baggage Electronic Equipment Rack
BFCU	Backup Flight Control Unit
BFL	Balanced Fuel Load
BFL	Balanced Field Length
BFO	Beat-Frequency Oscillator
BIN	Binary
BIT	Built-In-Test
BITE	Built-In Test Equipment
BIU	Battery Interface Unit
BL	Butt Line
BLD	Bleed
BLISK	Blended Disk
BMU	Battery Module Unit
BNR	Binary
BOT	Bottom
BOW	Basic Operating Weight
BPCU	Bus Power Control Unit
BPD	Bypass Duct
BRG	Bearing
BRK	Brake
BRT	Bright(ness)
BTL	Bottle
BTMS	Brake Temperature Monitoring System
BYTE	A Single Group or Parallel Binary Bits

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- C -

Aviation Acronym	Description
C	Capacitance, Centigrade, Celsius, Caution or Coulomb
C of A	Certificate of Airworthiness (FAA)
C/W	Comply or Complied With
CAB (Quality)	Corrective Action Board
CAB	Customer Advisory Board
CAM	Content Addressable Memory(AssociativeStorage)
CAMP	Computerized Aircraft Maintenance Program
CAP	Capture
CAR (Quality)	Corrective Action Request
CAS	Crew Alerting System
CAS	Calibrated Air Speed
CB	Circuit Breaker
CB	Customer Bulletin
CBPC	Cabin Bus Power Control
CCA	Circuit Card Assembly
CCD	Charge Coupled Device
CCD	Cursor Control Device
CCM	Cruise Control Manual
CCW	Counter-Clockwise
CD	Cabin Display or Control Display Unit
CDI	Course Deviation Indicator
CDU	Control Display Unit
CE	Course Error
CFI	Certified Flight Instructor
CFII	Certified Flight Instructor/Instrument
CFR	Code of Federal Regulations (FAA)
CFRP	Carbon Fiber Reinforced Plastics
CG	Center-of-Gravity
CH	Channel
CHAN / CHNL	Channel
CHG	Change
CHGR / CHRGR	Charger
CHI	Communication+Navigation+Identification
CIO	Control Input Output
CIR	Conformity Inspection Record (FAA 8100-1)
CKPT	Cockpit
CKT	Circuit
CLAW	Control Law
CLB	Climb
CLK	Clock
CLR	Clear
CLS	Contractor Logistic Support
CLSD	Closed
CM	Configuration Management
CMC	Central Maintenance Computer
CMD	Command
CMM (Quality)	Coordinate Measuring Machine
CMM	Component Maintenance Manual
CMOS	Complimentary Metal Oxide Semiconductor
CMP	Computerized Maintenance Program
CMPT	Composite or Compacted
CMPTR	Computer
CMR	Certification Maintenance Requirement
CMS	Central Management System
CND	Could Not Duplicate
CNTOR	Contactor
^oC	Degrees Celcius (or Centigrade)
CO₂	Carbon Dioxide
COBOL	Common Oriented Business Language
COM	Command
COM	Common
COMB	Combined
COMM	Communication(s)
COMP	Compass, Comprehensive, Compensation or Comparator
COMPT	Compartment
COMSEC	Communications Security
CONFIG	Configuration
CONT	Continuous
CONT / CTL / CTRL	Control
CONV	Converter
CORR	Correction
CP	Coupler or CrossPointer
CPAM	Cabin Pressure Acquisition Module
CPC	Cabin Pressure Controller
CPCP	Corrosion Prevention Control Program
CPCS	Cabin Pressure Control System
CPDLC	Controller Pilot Datalink Communication
CPI	Cabin Pressure Indicator
CPL	Couple(d)
CPLR	Coupler
CPM	Cycles Per Minute
CPS	Cycles Per Second
CPU	Central Processor Unit
CQA	Certified Quality Auditor
CRC	Cyclic Redundancy Check
CRS	Course
CRT	Cathode Ray Tube
CRZ	Cruise
CSD	Constant Speed Drive
CSDB	Comnercial Standard Digital Bus
CSO	Communications System Operator
CT	Control,Center Tap or Control Transformer
CTL	Control
CTLR	Controller
CTR	Center
CVR	Cockpit Voice Recorder
CW	Clockwise
CW	Continuous Wave or Clockwise

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- D -

Aviation Acronym	Description
DA	Drift Angle
DADC	Digital Air Data Computer
DADS	Digital Air Data System
DAFCS	Digital Automatic Flight Control System
DAMP	Damper
DAR	Designated Airworthiness Representative (FAA)
DAS	Designated Alteration Station (FAA)
DAU	Data Acquisition Unit(s)
DBDI	Digital Bearing/Distance Indicator
DC	Display Control(ler) or Direct Current
DCV	Directional Central Valve
DDRMI	Dual Digital Remote Magnetic Indicator
DDU	Display Drive Unit
DEC	Decrease
DECEL	Deceleration
DEFL	Deflection
DEFLT	Default
DEG	Degree or Degraded
DEL	Delete
DEMOD	Demodulator
DEP	Data Entry Plug (FADEC)
DER	Designated Engineering Representative (FAA)
DES	Descent
DESEL	Deselect(ed)
DEST	Destination
DET	Detent, Detector or Detachment
DETECT	Detection
DEV	Deviation or Deviate
DFDR	Digital Flight Data Recorder
DFRN	Differential
DGIO	Dual Generic Input Output
DGP	Dual Gauging Probe
DGRAD	Degraded (Accuracy-or-Performance)
DH	Decision Height
DIA	Diameter
DIFF	Differential
DIFM	Due In For Maintenance
DIP	Dual In-Line Package
DIR	Direct(to)
DIS	Display(ed)
DISC	Disconnect
DISCH	Discharge
DISCH / DSCHG / DISCHD	Discharge, Discharged
DISP	Display
DISPL	Displacement
DIST	Distance
DITS	Digital Information Transfer System
DL	Data Loader
DLMU	Dataloading Management Unit
DMA	Direct Memory Access
DME	Distance Measuring Equipment
DMIR	Designated Manufacturing Inspection Representative(s) (FAA)
DMT	Discrepant Material Tag
DN	Down
DOPI	Drop Out Pull In
DOT	Department of Transportation
DP	Digital Processor,Data Processing
DPDT	Double Pole Double Throw
DPI	Differential Pressure Indicator
DPST	Double Pole Single Throw
DR	Dead Reckoning
DRC	Dual Remote Compensator
DS	Detail Specification
DSPL	Display
DSPLSEL	Display Select(or)
DSR	Desired
DTA	Damage Tolerance Analysis
DTMF	Dual-Tone Multiple Frequency
DTO	Direct To
DU	Display Unit(s)
DUP	Duplicate
DV	Direct Vision
DVM	Digital Voltmeter

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- E -

Aviation Acronym	Description
E	East or Electromotive Force
E2PROM	(EEPROM)Electronically Erasable Programmable Read Only Memory
EB	Electric Backup
EBHA	Electrical Backup Hydrostatic Actuator
EBU	Engine Build Up
ECM	Electronic Control Module or Electronic Counter Measures
ECS	Environmental Control System
ECU	Electronic Control Unit
ED	Environmental Damage / Edge Distance
EDS	Electronic Display System
EDT	Electronic Data Transfer
EEC	Electronic Engine Control
EED	Emergency Exit Door
EER	Electronic Equipment Rack
EFFECT	Effectivity
EFIS	Electronic Flight Instrument System
EGPWM	Enhanced Ground Proximity Warning Module
EGPWS	Enhanced Ground Proximity Warning System
EGT	Exhaust Gas Temperature
EHSA	Electro Hydraulic Servo Actuator
EHSI	Electronic Horizontal Situation Indicator
EHSV	Electro-Hydraulic Servo Valve
EI	Engine Instrumentation
EICAS	Engine Instrument-Crew Advisory System
E-INV	Emergency Inverter
EIS	Entry Into Service
El	Engine Instrument
ELEV	Elevator
ELINT	Electronic Intelligence
ELT	Emergency Locator Transmitter
E-LTG	Emergency Lighting
EMC	Electromagnetic Compatibility
EMG / EMER / EMERG	Emergency
EMI	Electromagnetic Interference
ENG	Engaged
ENG	Engine
ENR	Enroute
ENT	Enter
EO	Easy-On or Engineering Order
EOL	End of Life
EP	Electro-Pneumatic
EPBP	Emergency Power Battery Pack
EPMP	Electric Power Management Panel
EPR	Engine Pressure Ratio
EPROM	Erasable Prom
EPS	Electrical Power System
EQUIP	Equipment
EROPS	Extended Range Of Operations
ESAD	Equivalent Still Air Distance
ESDSD	Electro-Static Discharge Sensitive Devices
ESM	Electronic Surveillance Measures
ESS	Essential
ET	Elapsed Time
ETA	Estimated Time of Arrival
ETC / etc	Et cetera (and the like)
ETD	Estimated Time of Departure
ETE	Estimated Time Enroute
EVAC	Evacuate
EVM	Electronic Vibration Monitoring or Engine Vibration Monitor
EVS	Enhanced Vision System
EXC	Exceedance
EXC	Excluding
EXLOC	Expanded Localizer
EXT	External or Extended
EXT	Extinguisher

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- F -

Aviation Acronym	Description
F	Fahrenheit
F&R	Function and Reliability
F/D	Frequency to Digital
FAA	Federal Aviation Administration
FADEC	Full Authority Digital Engine Control
FAF	Final Approach Fix
FAI	First Article Inspection
FAR	Federal Aviation Regulations (FAA)
FAV	Fan Air Valve
FBS	Front Beam Station
FBW	Fly By Wire
FCC	Flight Controls Computer
FCS	Flight Control System
FCS	Fuel Characteristics Sensor
FCU	Flush Control Unit
FCU	Fuel Control Unit
FD	Fatigue Damage
FDCU	Fire Detector Control Unit
FDR	Flight Data Recorder
FECU	Flaps Electronic Control Unit
FGC	Flight Guidance Computer
FGS	Flight Guidance System
FLIR	Forward Looking Infrared
FMC	Flight Management Computer
FMEA	Failure Modes & Effect Analysis
FMS	Flight Management System
^oF	Degrees Fahrenheit
FOD	Foreign Object Damage
FPGA	Field Programmable Gate Array
FPM	Feet Per Minute
FPS	Feet Per Second
FQI	Fluid Quantity Indication
FQSC	Fuel Quantity Signal Conditioner
FRACAS	Failure Reporting Analysis and Corrective Action System
FS	Fuselage Station
FSDO	Flight Standards District Office
FSECU	Flap Stab Electronic Control Unit
FTS	Fuel Temperature Sensor
FWD	Forward

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- G -

Aviation Acronym	Description
GAMPS	Gulfstream Aerospace Manufacturing Process Specifications
GCMS	Gulfstream Cabin Management System
GCU	Generator Control Unit
GFI	Ground Fault Interruption
GLA	Gust Load Alleviation
GND	Ground
GPS	Global Positioning System
GPWS	Ground Proximity Warning System
GSCP	Ground Service Control Panel

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- H -

Aviation Acronym	Description
HA	Hydraulic Actuator
HAPS	Hydrostatic Absolute Pressure Sensor
HCM	Hydraulic Control Module
HCM	Heater Control Module
HF	High Frequency (3-30 mhz)
HID	High Intensity Discharge
HIRF	High Intensity Radiated Fields
HLS	High Level Sensor
HMG	Hydraulic Motor Generator
HPA	High Power Amplifier
HPC	High Pressure Compressor
HPT	High Pressure Turbine
HSA	Horizontal Stab Actuator
HSCU	Horizontal Stabilizer Control Unit
HSTA	Horizontal Stab Trim Actuator
HSTS	Horizontal Stabilizer Trim System
HTR	Heater
HUD	Head Up Display
HV	Height-Velocity
HVOF	High Velocity Oxygen Fuel
HYD	Hydraulic
Hz	Hertz (cycles per second)

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- I -

Aviation Acronym	Description
I/0	Input/Output
IAS	Indicated Airspeed
IAW	In Accordance With
IB	Iron Bird (Hydraulic Simulation Facility)
IBIT	Initiated Build-In-Test
ICAO	International Civil Aviation Organization (FAA)
ICD	Interface Control Document
ICS	Inter-Communication(s) System
ICU	Interface Control Unit (TR)
ICU	Isolation Control Unit
ID	Identification
IDG	Integrated Drive/Generator
IDS	Intrusion Detection System
IETM	Interactive Electronic Technical Manual
IF	Intermediate Frequency
IFR	Instrument Flight Rules
IFSD	In-Flight Shut Down(Rate)
IGN	Ignition
ILS	Instrument Landing System / Integrated Logistics Support
IM	Inner Marker
IMC	Instrument Meteorological Conditions / Interim Message Change
IMPA	Integrated Motor Pump Assembly
IN	Input
INBD	Inboard
INC	Increase
IND	Indicator or Independent
INIT	Initialize/Initiate
INS	Inertial Navigation System
INSP	Inspection
INSTL	Installation
INT	Internal
INTGL	Integral
INTL	International
INTLK	Interlock
INU	Inertial Navigation Unit
INV	Inverter or Invert
IOC	Initial Operational Capability
IP	Intermediate Pressure/Initialization Point/Instructor Pilot
IPC	Illustrated Parts Catalog
IPCA	Intermediate Pressure Cooling Air
IR	Infrared
IRAN	Inspect and Repair as Necessary
IRC	Instrument Remote Controller
IRDS	Infrared Detection System
IRS	Inertial Reference System(s)
IRU	Inertial Reference Unit
IS	Inspection Schedule
ISA	International Standard Atmosphere
ISC	Industry Steering Committee
ISDU	Inertial System Display Unit
ISO	Isolation/lsochronal
ISO	International Standards Organization
ISS	Information Systems and Services
ITF	Integrated Test Facility
ITU	International Telecommunications Union
IVV	Instantaneous Vertical Velocity

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- J -

Aviation Acronym	Description
JAA	Joint Aviation Authorities
JAR	Joint Aviation Regulations (European FAR)
JCT	Junction
Jmp	Jumper(Wire)
JSA	Job Safety Analysis

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- K -

Aviation Acronym	Description
K	Kilo(1Thousand)
KCAS	Knots Calibrated Airspeed
Kg	Kilogram(s)
KHz	Kilohertz
KIAS	Knots Indicated Airspeed
KTAS	Knots True Airspeed
Kts	Knots

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- L -

Aviation Acronym	Description
L	Left
L/D	Lift-To-Drag(Ratio)
LAN	Local Area Network
LAT	Latitude or lateral
LB	Pound(s)
LBL	Left Butt Line
LBS	Lateral Beam Sensor
LCD	Liquid Crystal Display(s)
LCV	Lock Command Valve (TR)
LDG	Landing
LDP	Landing Decision Point
LED	Light-Emitting Diode(s)
LEER	Left Electronic Equipment Rack
LGCIS	Landing Gear Control and Indication System
LGCS	Landing Gear Control System
LH	Left Hand
Li-ON	Lighium Ion (Battery)
LLTV	Low-Light Television
LLWAS	Low Level Wind Shear Advisory System
LNAV	Lateral Navigation
LOC	Localizer
LOHM	Resistive Unit of Liquids
LONG	Longitude
LOX	Liquid Oxygen
LP	Low Pressure
LPC	Low Pressure Compressor
LPT	Low Pressure Turbine
LPV	Localizer Performance with Vertical Guidance
LPV	Latched Power Valid
LRC	Long Range Cruise
LRM	Line Replaceable Module
LRN	Long Range Navigation or Loran
LRU	Line Replaceable Unit
LSB	Lower Side Band or Least Significant Bit
LSC	Least Significant Character
LSWD	Low Speed Warning Device
LT(s)	Light(s)
LTG	Lighting
LV	Lower Voice
LVC	Line Voltage Compensation
LVDT	Linear Variable Differential Transducer(Transformer)
LWR	Lower

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- M -

Aviation Acronym	Description
M	Manual,Magnetic(Heading) or MEGA(1 Million)
M/T	Mach Trim
MAAS	Maximum Allowable Airspeed
MAC	Minimum Acceptable Control
MAC	Mean Aerodynamic Chord
MAD	Magnetic Anomaly Detector
MAG	Magnetic
MAINT	Maintenance
MAN	Manual
MAP	Missed Approach Point,Maximum Aerodynamic Pressure
MAR	Maritime
MAU	Modular Avionics Unit
MAX	Maximum
MCD	Magnetic Chip Detector
MCDU	Multi-Function Control Display Unit
MCE	Motor Control Electronics
MCL	Multiple Channel
MCSP	Mission Completion Success Probability
MCU	Modular Concept Unit
MDA	Minimum Decision Altitude
MED	Main Entry Door
MEL	Minimum Equipment List
MEPS	Manufacturing Engineering Process Standard
MFD	Multi Function Display
MG	Multi-Function Symbol Generatoror Motor/Generator Unit
MGT	Management
MH	Magnetic Heading
MHz	Megahertz
MIC(s)	Microphone(s)
MIDO	Manufacturing Inspection District Office (FAA)
MIL	Master Index List
MIL	Master Inspection List
MIL SPEC	Military Specification
MIN	Minimum or Minute(s)
MISO	Manufacturing Inspection Satellite Office (FAA)
MKR	Marker Beacon
MLA	Maneuver Load Alleviation
MLG	Main Landing Gear
MLS	Microwave Landing System
MM	Middle Marker or Maintenance Manual
MMEL	Master Minimum Equipment List
MMF	Manufacturer's Maintenance Facility (FAA)
MMO	Maximum Allowable Mach Number
MNPS	Minimum Navigation Performance Specifications
MOA	Memorandum of Agreement
MOB	Maintenance Operating Base
MOM	Momentary
MON	Monitor
MOS	Metal Oxide Semiconductor
MOSFET	MOS Field Effect Transistor
MOU	Memorandum of Understanding
MPEL	Maximum Permissible Exposure Level
MPP	Maintenance Program Proposal
MPT	Modular Power Tile
MRB (Quality)	Material Review Board
MRB	Maintenance Review Board
MRIP	Manufacturer's Recommended Inspection Program
MRR	Material Review Report
MS	Military Standard/Military Specification
MSB	Most Significant Bit
MSC	Most Significant Character
MSG	Message
MSG-3	Maintenance Steering Group 3rd Task Force Aircraft Maintenance Program
MSI	Maintenance Significant Item
MSL	Mean Sea Level
MSP	Maintenance Service Plan
MSR	Maximum Specific Range
MSU	Mode Select Unit
MTBF	Mean Time Between Failure
MTBM	Mean Time Between Maintenance
MTBR	Mean Time Between Removals
MTBUR	Mean Time Between Unscheduled Removals
MTOGW	Maximum Take-Off Gross Weight
MTT	Mach Trim Test
MVP	Moisture Vapor Protective

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- N -

Aviation Acronym	Description
N	North or Newton(s)
N/A	Not Applicable,Not Available
N2	HP Compressor Shaft Speed
NACA	National Advisory Committee for Aeronautics
NAP	Noise Abatement Program
NAS	National Aircraft Standard
NAS	National Aerospace Standard
NASA	National Aeronautics and Space Administration
NAT	North Atlantic
NATA	National Air Transportation Association
NATO	North Atlantic Treaty Organization
NAV	Navigate or Navigate Mode
NBAA	National Business Aircraft Association
NC	No Connection or Normally Closed
NC	Numerical Control
NCD	No Computed Data
NCFR	No Cause For Rejection
ND	Navigation Display
NDB	Non-Directional Beacon or Navigation Data Base
NDI	Non-Destructive Inspection
NDT	Non-Destructive Test
NDU	Navigation Display Unit
NFF	No Fault Found
NFPA	National Fire Protection Association
NGV	Nozzle Guide Vane
NHA	Next Higher Assembly
NIC	Network Interface Computer
NICAD	Nickel Cadmium
NIM	Network Interface Module
NIST	National Institute for Standards and Technology
NL	LP Compressor Shaft Speed
NLG	Nose Landing Gear
NM	Nautical Mile(s)(6,080feet)
NMC	Not Mission Capable
NMR	Nonconforming Material Report
NMS	Navigation Management System
NO	Normally Open
NOC	Nav On Course
NORM	Normal
NOTAM	Notice to Airmen (FAA/CAA)
NPRM	Notice of Proposed Rulemaking (FAA)
NRDY	NAV Ready (Ready to Navigate)
NRV	Non-Return Valve
NRZ	Non-Return to Zero
NSRDC	Naval Ship Research and Development Center
NTE	Not to Exceed
NTO	Notice to Operators
NTSB	National Transportation Safety Board
NTSC	National Television Systems Committee
NVM	Non Volatile Memory
NWS	Nose Wheel Steering
NWSU	Nose Wheel Steering Unit
NX	Next
NZ	Navigation Computer

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- O -

Aviation Acronym	Description
O/C	On Condition or On Course
OAT	Outside Air Temperature
OBS	Omni Bearing Selector
OC	On Course
ODAR	Organizational Designated Airworthiness Representative(s) (FAA)
OHP	Overhead Panel
OIS	Operational Information Supplement
OLN	Operating Limitations Note
OM	Outer Marker
OPP	Opposite
OPT	Optimum
OS	Original State
OSC	Oscillator
OSS	Over Station Sensor
OSU	Overspeed Splitter Unit
OTH	Over-The-Horizon
OUT	Output
OUTBD	Outboard
OUTBD	Outboard
OVBD	Overboard
OVHD	Overhead
OVHT	Overheat
OVSP	Overspeed
OWE	Operating Weight Empty
OXY	Oxygen

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- P -

Aviation Acronym	Description
P	Pressure or Pitot
PAH	Production Approval Holder (FAA)
PAMA	Professional Aviation Maintenance Association
PAR	Precision Approach Radar
PASS	Passengers
PAX	Passengers
PB	Pushbutton
PBIT	Power On Built In Test
PBX	Private Branch Exchange
PC	Performance Computer
PC	Production Certificate (FAA)
PCB	Production Certificate Board (FAA)
PCN	Pavement Classification Number
PCO	Production Change Order
PCS	Performance Computer System
PCW	Previously Complied With
PCWS	Pitch Control Wheel Steering
PDB	Power Distribution Bus
PDU	Power Drive Unit
PED	Pedestal
PERF	Performance
PFCS	Primary Flight Control System
PFD	Primary Flight Display(s)
PFDT	Primary Flight Display Transfer
PGM	Program
PGS	Pages
PI	Engine Inlet Total Pressure
PI	Principal Inspector (FAA)
PIR	Pulsed Infrared
PIS	Pitot-Static or Pitot Switch
PIT	Pitch
PIV	Peak Inverse Voltage
PIV	Pack Inlet Valve
PJ	Pre-Program Planning
PK	Peak
PLA	Power Lever Angle
PLA	Primary Lock Actuator
PLR	Production Limitation Record (FAA)
PLS	Point Level Sensor
PM	Phase Modulation
PMA	Parts Manufacturer Approval
PMI	Principal Maintenance Inspector (FAA)
PND	Pilot's Numerical Display
PNL	Panel
POA	Purchased on Assembly
POR	Point of Regulation
POS	Position
PPH	Pounds Per Hour
PPI	Plan-Position Indicator
PPOS	Present Position
PRE	Preset
PRESS	Pressure
PREV	Previous
PRF	Pulse Repetition Frequency
PRI	Primary
PROC	Processor
PROC	Processor
PROF	Profile
PROG	Progress
PROM	Programmable Read Only Memory
PRR	Pulse Repetition Rate
PRT	Port
PSE	Principal Structural Element
PSI	Pound(s) Per Square Inch
PSIG	Pound(s) Per Square Inch Gauge
PSR	Primary Surveillance Radar
PRV	Pressure Relief Valve
PSU	Passenger Service Unit
PTS	Points
PTT	Push-to-Talk or Push-To-Test
PV	Power Valid
PW	Pulse Width
PWM	Pulse Width Modulation
PWR	Power
PZ	Performance Computer

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- Q -

Aviation Acronym	Description
QCDR	Quality Control Discrepancy Report
QFE	StandardHeight Above Field Elevation
QFP	Quiet Flying Procedures
QNE	Standard Pressure Altitude of 29.92/1013
QNH	Standard Height Above MSL
QRH	Quick Reference Handbook
QTP	Qualification Test Program/Procedure
QTR	Qualification Test Report
QTY	Quantity
QUAL	Quality or Qualify

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- R -

Aviation Acronym	Description
R	Remote,Return,Right or Resistance
R/A	Radio Altimeter or Radio Altitude
R/T	Receiver-Transmitter,Radio Altimeter or Rate of Turn
RAD	Radial,Radiate or Radiation
RAD/BAR	Radio and Barometric Altimeter
RAIM	Receiver Autonomous Integrity Monitoring
RAM	Random Access Memory
RAT	Ram Air Turbine
RBL	Right Butt Line
RBS	Rear Beam Station
RC	Rate of Climb (or Change)
RCL	Recall
RCPT	Receptacle
RCT	Rain Echo Attenuation Compensation Technique(React)
RCU	Remote Control Unit
RCVR	Receiver
RCWS	Roll Control Wheel Steering
RDA	Remote Diagnostic Analyzer
RDC	Remote Data Concentrator
RDR	Radar
REER	Right Electronic Equipment Rack
REF	Reference
RES	Resolution
RET	Return
RETR	Retract
REU	Remote Electronics Unit
REV	Revision,Reversion or Reverse
RF	Radio Frequency
RFI	Radio Frequency Interference
RH	Right Hand
RIU	Remote Interface Unit
RM&A	Reliability Maintainability and Availability
RMA	Remote Diagnostic Analyzer
RMI	Radio Magnetic Indicator
RMR	Recommended Maintenance Requirements
RMT	Remote
RNAPP	RNAV Approach Mode
RNAV	Area Navigation
RNG	Range
RNP	Required Navigation Performance
ROL	Roll
ROM	Read Only Memory
RON	Remain Overnight
RPM	Revolutions Per Minute
RPS	Remote Power Supply
RQAAT	Reliability Quality Availability Action Team
RRS	Radio Reference Sensor
RSU	Radio Select Unit
Rt	Right
RTB	Return to Base
RTCA	Radio Technical Commission Fo rAeronautics
RTO	Rejected Take Off
RTU	Radio Tuning Unit
RTV	Room Temperature Vulcanization
RUD	Rudder
RVDT	Rotary Voltage Displacement Transducer
RVDT	Rotary Variable Differential Transducer
RVR	Runway Visual Range
RVSR	Reversers (Thrust)
RVT	Rotary Variable Transducer
RX	Receiver
RZ	Return to Zero

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- S -

Aviation Acronym	Description
S	South or Static
S/O	Shutoff
SAE	Society of Automotive Engineers
SAR	Search-and-Rescue or Synthetic Aperture Radar
SAT	Static Air Temperature
SAT	Supplier Access Team
SATCOM	Satellite Communications
SAV	Starter Air Valve
SB	Service Bulletin
SBW	Steer By Wire
SC	Source Controller or Single Cue
SCAT	Speed Command of Attitude and Thrust
SCI	Serial Control Interface
SCR	Silicon Controlled Rectifier
SCS	Single Channel Select
SCU	Signal Conditioning Unit
SD	Service Digital
SDADC	Selected DADC
SDD	Sensor Display Driver(s)
SDI	Source Destination Index or Strategic Defense Initiative
SDLC	Synchronous Data Link Control
SDU	Satellite Data Unit
SEC	Second(s) or Secondary
SEL	Select
SELCAL	Selective Calling System
SFC	Specific Fuel Consumption
SG	Symbol Generator(s)
SGIO	Single Generic Input Output
SGP	Single Gauging Probe
SHN	Shown
SHP	Shaft Horse Power
SID	Standard Instrument Departure
SIFCU	Sub-Idle Fuel Control Unit
SIG	Signal
SIM	Simultaneous or Simulator
SIN	Sine
SING	Single
SIPO	Serial In-Parallel Out
SLV	Slave
SMC	Standby Multifunction Controller
SOV	Shut Off Valve
SP	Space
SPASE	Single-Point-Exclusive-Audio-System-Earth
SPC	Statistical Process Control
SPD	Speed
SPDS	Secondary Power Distribution System
SPK	Speaker
SPR	Single Point Refueling
SQ	Squelch
SR	Soft Ride
SRM	Structural Repair Manual
SRN	Short Range Navigation
SSB	Single Side Band
SSEC	Static Source Error Correction
SSI	Structurally Significant Item
SSM	Sign Status Matrix
SSPC	Solid State Power Controller
SSR	Secondary Surveillance Radar
SSU	Signal Switching Unit
STAB	Stabilization or Stabilizer
STAEL	Station Elevation
STAR	Standard Terminal Arrival Route
STBY	Standby
STC	Supplemental Type Certificate
STCS	Single Trim Channel Select
STIC	System Text Includes Component
STP	Steep
STR	Steering
SUBQ	Subsequent
SVO	Start Valve Open
SVS	Service
SW	Switch or Software
SWC	Stall Warning Computer
SYNC	Synchronous or Synchronize(d)
SYNC	Synchronization
SYS	System
SYSDSPL	System Display

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- T -

Aviation Acronym	Description
T	TRUE(Heading),Temperature or Transistor
T/CAS	Traffic Alert/Collision Avoidance System
T/R	Thrust Reverser
TACH	Tachometer
TAMB	Temperature at Ambient
TARSYN	Three Axis Reference Sensor
TAS	TRUE Air Speed
TAT	TRUE Air Temperature or Total Air Temperature
TAT	Total Air Temperature
TC	Type Certificate (FAA)
TCAS	Traffic Alert and Collision Avoidance System
TCS	Touch Control Steering
TCTO	Time Compliance Technical Order
TDP	Takeoff Decision Point
TEMP	Temperature
TGT	Targetor Turbine Gas Temperature
THD	Total Harmonic Distortion
TI	Intake Total Air Temperature
TIT	Turbine Inlet Temperature
TJ	Terminal Junction
TK	Track or Turn Knob
TK/GS	Track Angle/Ground-Speed
TKE	Track Angle Error
TKOD	Turn Knob Out Of Detent
TLA	Torque Limit-Aileron
TLE	Torque Limit-Elevator
TLSV	Tertiary Lock Solenoid Valve (TR)
TLV	Tertiary Lock Valve (TR)
TLX	Telex
TM	Trim Servo Actuator
TMS	Thrust Management System(orSettings)
TO	Take-Off
TOC	Top-of-Climb
TOD	Top-of-Descent
TOGA	Take-Off/Go Around
TOT	Turbine Outlet Temperature
TP	Testpoint
TQA	Throttle Quadrant Assembly
TRANS	Transistion or Transmit
TRK	Track
TRS	Thrust Reference System(orSettings)
TRT	Takeoff Rated Thrust
TROV	Thrust Recovery Outflow Valve
TRU	Transformer-Rectifier Unit(s)
TSLV	Tertiary Solenoid Lock Valve
TSN	Time Since New
TSO	Technical Standard Order/Time Since Overhaul
TTG	Time-To-Go
TTL	Tuned to Localizeror Transistor-Transistor Logic
TURB	Turbine
TX	Transmitter
TXWRNEN	Transmitter Warning Enable

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- U -

Aviation Acronym	Description
UART	Universal Asynchronous Receiver-Transmitter
UD	Upper Data
UDI	Universal Digital Interface
UHF	Ultra High Frequency (300+ mhz)
UPR	Upper
UPS	Uninterruptable Power Supply
USB	Upper Side Band
USB	Universal Serial Bus
UTIL	Utility
UTM	Universal Trans-Mercator(GridProjection)
UUT	Unit Under Test
UV	Upper Voice or Ultra Violet

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- V -

Aviation Acronym	Description
V&V	Verification and Validity
V/IPS	Volts/Inch Per Second
VA	Volt Ampere
VAC	Volt(s)Alternating Current
VAL	Valid
VANG	Vertical Angle
VAPP	VOR Approach Mode
VAR	Variable or Variation
VASl	(FMSVNAV)Altitude Preselect
VBS	Vertical Beam Sensor
VCO	Voltage Controlled Oscillator
VERT	Vertical
VFlCH	(FMSVNAV)Flight level Change
VFR	Visual Flight Rules
VG	Vertical Gyroscope
VHF	Very High Frequency (30-300 mhz)
VIRS	Voted IRS
VLD	Valid
VlF	Very low Frequency
VM	Voltmeter
VMC	Visual Meteorological Conditions
VMO	Maximum Allowable Airspeed
VNAV	Vertical Navigation
VOL	Volume
VOR	VHF Omni Range
VOR	Very High Frequency Omnidirectional Range Radio
VORTAC	Collocated VOR and Tacan Stations
VPTH	(FMSVNAV)Vertical Path
VRT	Vertical
VS	Vertical Speed
VSI	Vertical Speed Indicator
VSM	Vehicle Software Management
VSV	Variable Stator Vane
VSWR	Voltage Standing Wave Ratio
VVI	Vertical Velocity Indicator
VWS	Vacuum Waste System

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- W -

Aviation Acronym	Description
W	West,Watts,or Warning
W/	With
W/O	Without
WAAS	Wide Area Augmentation System
WAI	Wing Anti Ice
WAT	Weight,Altitude,Temperature
WC	Weather Radar Controller
WL	Wings level or Waterline
WLAN	Wireless Local Area Network
WO	Wash Out
WOW	Weight On Wheels
WPT	Waypoint
WR	Weather Radar
WRN	Warning
WSHLD	Windshield
WSS	Wheel Speed Sensor
WT	Weight
WTBF	Wing to Body Faring
WWS	Water/Waste System
WX	Weather
WXPD	Weather Radar Picture Data
WXR	Weather Radar

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- X -

Aviation Acronym	Description
X-FER	Transfer
XFMR	Transformer
XFR	Transfer