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Aviation Acronyms

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 -

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
Back to Top

- 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  
Back to Top

- 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
Back to Top

- 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)  
Back to Top

- 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
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) 
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