AAIB
Air Accident Investigation Branch
AAL
Above Airfield Level
AAN
Airworthiness Approval Note
Ac
Altocumulus
AC
Alternating Current
AC
Air Conditioning
AC
Advisory Circular
AD
Airworthiness Directive
ADF
Automatic Direction Finder
ADI
Attitude Director Indicator
ADR
Advisory Route
AGL
Above Ground Level
AH
Artificial Horizon
AI
Attitude Indicator
AIP
Aeronautical Information Publication
Alt
Altitude
AMC
Acceptable Means of Compliance
AME
Authorised Medical Examiner
AMOC
Alternative Method of Compliance
AMSL
Above Mean Sea Level
ANGR
Air Navigation (General) Regulations
ANO
Air Navigation Order
ANR
Active Noise Reduction
AoA
Angle of Attack
AOPA
Aircraft Owners and Pilots Association
API
Actuator Position Indicator
APU
Auxillary Power Unit
ARC
Airworthiness Review Certficate
ASI
Airspeed Indicator
ATA
Actual Time of Arrival
ATIS
Automatic Terminal Information Service
ATPL
Airline Transport Pilots License
ATSIN
Air Traffic Services Information Notice
AUM
All Up Mass
AUW
All Up Weight
Avgas
Aviation Gasoline
BA
Balance Arm
BALPA
British Airline Pilots Association
BCN
Beacon
BEM
Basic Empty Mass
BHAB
British Helicopter Advisory Board
BHP
Brake Horsepower
BKN
Broken (5-7 octas cloud cover)
BOCAS
Base of Controlled Airspace
Brg
Bearing
BT
Bolletino Technico
CAA
Civil Aviation Authority
CAP
Civil Aviation Publication
CAS
Calibrated Airspeed
CB
Cumulonimbus
Cd
Coefficient of Drag
CFI
Chief Flying Instructor
CG
Center of Gravity
CGI
Chief Ground Instructor
CHT
Cylinder Head Temperature
Cl
Coefficient of Lift
CMR
Certificate of Maintenance Review
CofA
Certificate of Airworthiness
Com
Communication
CP
Chief Pilot
CPL
Commercial Pilots License
CRS
Certificate of Release to service
Crs
Course
CTM
Centrifugal Turning Moment
Cu
Cumulus
DA
Decision Altitude
DC
Direct Current
DCT
Direct
DH
Decision Height
DI
Direction Indicator
DME
Distance Measuring Equipment
DOI
Dry Operating Index
DOM
Dry Operating Mass
DR
Dead Reckoning
EAS
Equivalent Airspeed
EASA
European Aviation Safety Agency
ECS
Environmental Control System
EGT
Exhaust Gas Temperature
EICAS
Engine Indication and Crew Alerting System
ELT
Emergency Locator Transmitter
ETA
Estimated Time of Arrival
ETE
Estimated Time Enroute
FAA
Federal Aviation Administration
FAF
Final Approach Fix
FAP
Final Approach Point
FCL
Flight Crew Licensing
FI [R]
Flying Instructor [Restricted]
FL
Flight Level
FM
Flight Manual
FM
Frequency Modulation
FREDA
Fuel, Radio, Engine, Direction, Altitude
FTO
Flying Training Organisation
GA
General Aviation
GHz
Gigahertz
GNC
GPS / Nav / Com
GPH
Gallons Per Hour
GPS
Global Positioning System
GS
Ground Speed
GS
Glide Slope
H24
24 Hour Service
HCGB
Helicopter Club of Great Britain
Hdg
Heading
HISL
High Intensity Strobe Light
HJ
Sunrise to Sunset
HN
Sunset to Sunrise
HO
By Operational Requirements
HoT
Head of Training
HS
During Hours of Scheduled Operations
HSI
Horizontal Situation Indicator
HX
No Specific Working Hours
Hz
Hertz
IAF
Initial Approach Fix
IAS
Indicated Airspeed
ICAO
International Civil Aviation Organization
IF
Instrument Flying
IF
Induced Flow
IFR
Instrument Flight Rules
IGE
In Ground Effect
ILS
Instrument Landing System
IMC
Instrument Meteorological Conditions
Inop
Inoperative
INS
Inertial Navigation System
IPS
Inches Per Second
IR
Instrument Rating
IRS
Inertial Reference System
ISA
International Standard Atmosphere
JAA
Joint Aviation Authorities
JAR
Joint Aviation Regulations
KHz
Kilohertz
KM
Kilometer
LAE
Licenced Aircraft Engineer
LFL
Lower Flammable Limit
LI
Loading Index
LPC
License Proficiency Check
LST
License Skills Test
MAG
Magnetic
MCASD
Military / Civil Air Safety Day
MCC
Multi Crew Cooperation
MCD
Magnetic Chip Detector
MCP
Maximum Continuous Power
MDA
Minimum Descent Altitude
MDH
Minimum Descent Height
MEL
Minimum Equipment List
MHz
Megahertz
MLS
Microwave Landing System
MMEL
Master Minimum Equipment List
MR
Main Rotor
MSDS
Material Safety Data Sheet
MSL
Mean Sea Level
MSLM
Maximum Structural Landing Mass
MZFM
Maximum Zero Fuel Mass
N1
Gas Producer Speed
N2
Power Turbine Speed
NATS
National Air Traffic Services
Nav
Navigation
NDB
Non Directional Beacon
NM
Nautical Mile
NOTAM
Notices To Airmen
NPA
Non Precision Approach
NPA
Notice Of Proposed Amendment
NS
Nimbostratus
NSW
No Significant Weather
NTSB
National Transportation Safety Board
OAT
Outside Air Temperature
OCA
Obstacle Clearance Atlitude
OGE
Out of Ground Effect
OM
Operating Mass
OM
Outer Marker
OML
Operational Multi-Crew Limitation
OPC
Operator Proficiency Check
Ops
Operations
OS
Ordnance Survey
OVC
Overcast (8 octas cloud cover)
PANS-OPS
Procedures for Air Navigation Services, Operations
PAOC
Police Air Operators Certificate
PAPI
Precision Approach Path Indicator
PAR
Precision Approach Radar
PET
Point of Equal Time
PF
Pilot Flying
PFA
Popular Flying Association
PFM
Pilots Flight Manual
PLD
Personnel Licensing Department
PLLM
Performance Limited Landing Mass
PNF
Pilot Not Flying
PNR
Point of No Return
POH
Pilots Operating Handbook
PPL
Private Pilots License
PPO
Prior Permission Only
PPR
Prior Permission Required
QASP
Qualified, Authorized, Supervised and Prepared
QDM
Magnetic Bearing To Facility
QDR
Magnetic Bearing From Facility
QFU
Magnetic Orientation Of Runway
RAF
Relative Air Flow
RAFAT
Royal Air Force Aerobatic Team
RAS
Rectified Airspeed
REIL
Runway End Identifier Lights
RFM
Rotorcraft Flight Manual
RL
Runway (edge) Lights
RLM
Regulated Landing Mass
RMI
Relative Magnetic Indicator
RoC
Rate Of Climb
RoD
Rate Of Descent
RPM
Revolutions Per Minute
RT
Radio Telephony
RT
Rotor Thrust
RTF
Registered Training Facility
RTOM
Regulated Take Off Mass
RVR
Runway Visual Range
SAR
Search And Rescue
SAS
Stability Augmentation System
SB
Service Bulletin
SCT
Scattered (3-4 octas cloud cover)
SID
Standard Instrument Departure
SKC
Sky Clear
SM
Statute Mile
SMI
Scheduled Maintenance Inspection
SOAP
Spectrometric Oil Analysis Programme
SRA
Surveillance Radar Approach
SSR
Secondary Surveillance Radar
STAR
Standard Terminal Arrival
STOL
Short Take Off and Landing
SWP
Settling With Power
TAF
Terminal Area Forecast
TAS
True Airspeed
TBO
Time Between Overhauls
TITS
Tune, Identify, Test, Set
TMG
Touring Motor Glider
TMG
Track Made Good
TOGW
Takeoff Gross Weight
TOM
Take Off Mass
TOP
Takeoff Power
Tq
Torque
TR
Type Rating
TR
Tail Rotor
TRE
Type Rating Examiner
TRI
Type Rating Instructor
TRK
Track
TRT
Total Rotor Thrust
TRTO
Type Rating Training Organisation
TTFTT
Time, Turn, Flap, Throttle, Talk
VAR
Variation
VASI
Visual Approach Slope Indicator
VCFG
Fog In Vicinity
VFR
Visual Flight Rules
Vh
Stabilised Level Flight Speed at MCP
Vi
Velocity of Induced Flow
VMC
Visual Meteorological Conditions
Vne
Velocity Never to be Exceeded
Vno
Maximum Structural Cruise Speed
VRB
Variable
VRS
Vortex Ring State
VSA
By Visual Reference to the ground.
VSI
Vertical Speed Indicator
VSP
Vertical Speed
VTOL
Vertical Take Off and Landing
VV
Vertical Visibility
W&B
Weight And Balance
WB
Weight And Balance
Xpdr
Transponder
ZFM
Zero Fuel Mass