| Abbreviation | Decode |
|---|
| AAIB | Air Accident Investigation Branch |
| AAL | Above Airfield Level |
| AAN | Airworthiness Approval Note |
| Ac | Altocumulus |
| AC | Air Conditioning |
| AC | Advisory Circular |
| AC | Alternating Current |
| 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 | Frequency Modulation |
| FM | Flight Manual |
| 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 | Glide Slope |
| GS | Ground Speed |
| 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 |
| LODA | Letter Of Design Approval |
| LPC | License Proficiency Check |
| LST | License Skills Test |
| MAG | Magnetic |
| MCASD | Military / Civil Air Safety Day |
| MCC | Multi Crew Cooperation |
| MCD | Magnetic Chip Detector |
| 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 |
| PMA | Parts Manufacturer Approval |
| 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 | Rotor Thrust |
| RT | Radio Telephony |
| RTF | Registered Training Facility |
| RTOM | Regulated Take Off Mass |
| RVR | Runway Visual Range |
| SAIB | Special Airworthiness Information Bulletin |
| 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 |
| SOAP | Spectrographic Oil Analysis Program |
| SRA | Surveillance Radar Approach |
| SSR | Secondary Surveillance Radar |
| STAR | Standard Terminal Arrival |
| STC | Supplemental Type Certificate |
| 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 |
| TODR | Take Off Distance Required |
| TOGW | Takeoff Gross Weight |
| TOM | Take Off Mass |
| TOP | Takeoff Power |
| TOSR | Take Off Space Required |
| Tq | Torque |
| TR | Tail Rotor |
| TR | Type Rating |
| TRE | Type Rating Examiner |
| TRI | Type Rating Instructor |
| TRK | Track |
| TRT | Total Rotor Thrust |
| TRTO | Type Rating Training Organisation |
| TSO | Technical Standard Order |
| 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 |