Abbreviations & Acronyms

A

AA - Acceleration Altitude
AC - Alternating Current
A/C - Aircraft
ACARS - Aircraft Communication Addressing and Reporting System
ACN – Aircraft Classification Number
AD – Airworthiness Directive
ADC – Air Data Computer
ADF – Automatic Direction Finder
ADI – Attitude Director Indicator
ADU – Air Data Unit
AGL – Above Ground Level
AH – Artificial Horizon
AI – Attitude Indicator
AIP – Aeronautical Information Publication
ALS – Approach Lighting System
ALT – Altitude
AMSL – Above Mean Sea Level
AoA – Angle of Attack
AOC – Air Operators Certificate
AOG – Aircraft on Ground
AOM – Aircraft Operating Manual
AP – Auto Pilot
APP – Approach
APT – Airport
APU – Auxiliary Power Unit
ANP – Actual Navigation Performance
ARP – Aerodrome Reference Point
ASDA – Accelerate Stop Distance Available
ASI – Airspeed Indicator
ASR – Airport Surveillance Radar
AT – Auto Throttle
ATC – Air Traffic Control
ATIS – Automatic Terminal Information Service
ATM – Air Traffic Management

B

BA – Braking Action
BCS – Back Course (ILS)
BPR – By-Pass Ratio

C

CA - Captain
CA – Critical Area (ILS)
CAS – Calibrated Air Speed
CAT – Category (ILS)
CAT – Clear Air Turbulence
CAVOK – Ceiling and Visibility OK
CB – Circuit Breaker
CB – Cumulonimbus
CDA – Continuous Descent Approach
CDI – Course Deviation Indicator
CDU – Control Display Unit
CFIT – Controlled Flight Into Terrain
CL – Center Line
CLB – Climb
CMD – Command
CMV – Converted Meteorological Visibility
CoG - Center of Gravity
CON - Contingency Fuel
CON - Continuous Ignition
CON - (MAX) Continuous Thrust
CPT - Captain
CRM - Crew Resource Management
CRZ - Cruise
CTR - Center
CVR - Cockpit Voice Recorder
CWS - Control Wheel Steering

D

DA - Decision Altitude
DALR - Dry Adiabatic Lapse Rate
DC - Direct Current
DER - Departure End (of the) Runway
DH - Decision Height
DI - Direction Indicator
DME – Distance Measuring Equipment

E

EAT – Estimated Approach Time
EET – Estimated Elapsed Time
EFB – Electronic Flight Bag
EFIS – Electronic Flight Information System
EGT – Exhaust Gas Temperature
EGPWS – Enhanced Ground Proximity Warning System
EHSI – Electronic Horizontal Situation Indicator
ELT – Emergency Locator Transmitter
EMR – Emergency
EPR – Engine Pressure Ratio
ET – Elapsed Time
ETA – Estimated Time of Arrival
ETOPS – Extended-range Twin-engine Operational Performance Standards
ETOW – Estimated Take Off Weight
ETP – Equal Time Point
EZFW – Estimated Zero Fuel Weight

F

FA - Flight Attendant
FAA - Federal Aviation Administration
FADEC – Full Authority Digital Engine Control
FAF – Final Approach Fix
FAR – Federal Aviation Regulation
FBW – Fly By Wire
FCOM – Flight Crew Operations Manual
FCTM – Flight Crew Training Manual
FD – Flight Director
FIR – Flight Information Region
FIS – Flight Information Service
FMC – Flight Management Computer
FMS – Flight Management System
FO - First Officer
FOM - Flight Operations Manual
FOM – Fuel of Merit
FOD – Foreign Object Damage
FPA – Flight Path Angle
FPL – Flight Plan
FPM – Feet Per Minute
FREQ – Frequency
FT – Flight Training

G

G – G-force
GA – General Aviation
G/A – Go Around
GND – Ground
GNSS – Global Navigation Satellite System
GP – Glide Path
GPA – Glide Path Angle
GPWS – Ground Proximity Warning System
GS – Ground Speed
GS – Glide Slope

H

HDG - Heading
HF - High Frequency
HIALS - High Intensity Approach Lighting System
HPA - Hectopascal
HP - High Pressure
HPT - High Pressure Turbine
HSI - Horizontal Situation Indicator
HUD - Heads Up Display
HYD - Hydraulics

I

IAP - Instrument Approach Procedure
IAF - Initial Approach Fix
IAS - Indicated Air Speed
IDG - Integrated Drive Generator
IFR - Instrument Flight Rules
ILS – Instrument Landing System
IMC – Instrument Meteorological Conditions
INOP – Inoperative
INS – Inertial Navigation System
IRS – Inertial Reference System
IRU – Inertial Reference Unit
ISA – International Standard Atmosphere

K

IAS – Knots Indicated Airspeed
KM – Kilometers
KTS – Knots

L

LD – Landing Distance
LDA – Landing Distance Available
LDR – Landing Distance Required
LG – Landing Gear
LOC – Localizer
LORAN – Long Range Navigation
LNAV – Lateral Navigation
LP – Low Pressure
LSK – Line Select Key
LT – Local Time
LTP – Landing Threshold Point
LVL – Level
LVP – Low Visibility Procedures
LW – Landing Weight

M

MAA – Missed Approach Altitude
MACG – Missed Approach Climb Gradient
MAP – Missed Approach Point
MCP – Mode Control Panel
MCRIT – Critical Mach Number
MCT – Maximum Continuous Thrust
MDA – Minimum Decent Altitude
MDH – Minimum Decent Height
MEA– Minimum Enroute Altitude
MEL – Minimum Equipment List
MMEL – Master Minimum Equipment List
MET – Meteorological
METAR – Meteorological Aerodrome Report
MLW – Maximum Landing Weight
MM – Middle Marker
MMO – Maximum Mach Number
MOC – Minimum Obstacle Clearance
MORA – Minimum Off Route Altitude
MRW – Maximum Ramp Weight
MSA - Minimum Safe Altitude
MSA - Minimum Sector Altitude
MSL - Mean Sea Level
MTOW - Maximum Take Off Weight
MZFW - Maximum Zero Fuel Weight

N

N1 - Low Pressure Compressor Speed
N2 - High Pressure Compressor Speed
NADP - Noise Abatement Departure Procedure
NAV - Navigation
ND - Navigation Display
NDB - Non-Directional Beacon
NM - Nautical Mile
NOTAM - Notice to Airmen
NWS - Nose Wheel Steering

O

OAT - Outside Air Temperature
OBS - Omni Bearing Selector
OEI - One Engine Inoperative
OEM - Original Equipment Manufacturer
OFP - Operational Flight Plan
OM - Operations Manual
OM - Outer Marker
OTS - Out of Service
OW - Operational Weight
OXY - Oxygen
O2 - Oxygen

P

PA - Public Announcement
Packs - Air Conditioning Units
PAPI - Precision Approach Path Indicator
PAR - Precision Approach Radar
PAX - Passengers
PFD - Primary Flight Display
PIC - Pilot In Command
PIREP - Pilot Report
POH - Pilot's Operating Handbook
PNR - Point of No Return
PSR - Point of Safe Return
PTT - Push To Talk

Q

QFE - Field Elevation (Pressure Setting)
QNH - Regional Pressure Setting
QRH - Quick Reference Handbook
QTY - Quantity

R

RA - Radio Altimeter
RA - Resolution Advisory
RADAR - Radio Detection and Ranging
RAT - Ram Air Turbine
REL - Runway Edge Lights
RESA - Runway End Safety Area
RMI - Radio Magnetic Indicator
RNAV - Area Navigation
RNP - Required Navigation Performance
RTO - Rejected Take Off
RVR - Runway Visual Range
RVSM - Reduced Vertical Separation Minima
RW - Runway
RWY - Runway

S

SADLR - Saturated Adiabatic Lapse Rate
SAT - Saturated Air Temperature
SELCAL - Selective Calling
SHF - Super High Frequency
SIC - Second In Command
SID - Standard Instrument Departure
SIGMENT - Significant Meteorological Advisory
SLP - Sea Level Pressure
SM - Statute Mile
SMR - Surface Movement Radar
SOPs - Standard Operating Procedures
SR - Sunrise
SS - Sunset
STA - Scheduled Time of Arrival
STA - Station
STAR - Standard Terminal Arrival Route
STD - Scheduled Time of Departure
STD - Standard

T

TA - Transition Altitude
TA - Traffic Advisory
TAA - Terminal Arrival Area
TACAN - Tactical Air Navigation
TAF - Terminal Area Forecast
TAS - True Airspeed
TAT - Total Air Temperature
TCAS - Traffic Collision Avoidance System
TCH - Threshold Crossing Height
TDZ - Touchdown Zone
TERPS - Terminal Procedures
TFC - Traffic
THR - Threshold
TL - Thrust Lever
TL - Transition Level
TLA - Thrust Lever Angle
TMA - Terminal Maneuvering Area
T/O - Takeoff
TO/GA - Takeoff/Go Around
TOC - Top of Climb
TOD - Top of Descent
TODA - Takeoff Distance Available
TORA - Takeoff Run Available
TOW - Takeoff Weight
TS - Thunderstorm
TWC - Tailwind Component
TWR - Tower
TWY - Taxiway

U

UA - Unusual Attitude
UAV - Unmanned Air Vehicles
UHF - Ultra High Frequency
UTC - Universal Coordinated Time (Zulu/GMT)

V

VASI - Vertical Approach Slope Indicator
VFR - Visual Flight Rules
VHF - Very High Frequency
VMC - Visual Meteorological Conditions
VNAV - Vertical Navigation
VOR - VHF Omni Directional Radio Range
VRB - Variable
VS - Vertical Speed
VSI - Vertical Speed Indicator
VV - Vertical Visibility

W

WPT - Waypoint
WX - Weather

X

XPDR - Transponder
XWC - Crosswind Component

Z

Z - Zulu Time (UTC/GMT)
ZFW - Zero Fuel Weight