Abbreviations
This page provides a reference list of common abbreviations and acronyms used throughout the COMAC C919 aircraft documentation. These abbreviations cover major systems, avionics, cockpit indicators, and operational procedures.
💡 This list will be continuously updated as more systems and documents are added.
| Abbreviation | Full Name |
|---|---|
| A/THR | Autothrust |
| ABCU | Alternate Brake Control Unit |
| AC | Alternating Current |
| ACARS | Aircraft Communications Addressing and Reporting System |
| ACP | Audio Control Panel |
| ADS-B | Automatic Dependent Surveillance–Broadcast |
| AFCS | Automatic Flight Control System |
| AFT EAFR | Aft Enhanced Aircraft Flight Recorder |
| AJP | Audio Jack Panel |
| AOA | Angle of Attack |
| AOC | Aeronautical Operational Control |
| AP | Autopilot |
| APU | Auxiliary Power Unit |
| ARINC | Aeronautical Radio Incorporated |
| ASG | APU Starter Generator |
| AT | Autothrottle |
| ATC | Air Traffic Control |
| ATIS | Automatic Terminal Information Service |
| AUX | Auxiliary |
| BATT | Battery |
| BATT CHG | Battery Charger |
| BCMU | Brake Control and Monitoring Unit |
| BIT | Built-In Test |
| CAB | Cabin |
| CAS | Calibrated Air Speed / Crew Alerting System |
| CAT | Category |
| CB | Circuit Breaker |
| CBIC | Circuit Breaker Indication and Control |
| CCD | Cursor Control Device |
| COMM | Communication |
| CVR | Cockpit Voice Recorder |
| DC | Direct Current |
| DCP | Display Control Panel |
| DH | Decision Height |
| DISC | Disconnect |
| DME | Distance Measuring Equipment |
| EAFR | Enhanced Airborne Flight Recorder |
| EFB | Electronic Flight Bag |
| EGT | Exhaust Gas Temperature |
| EICAS | Engine Indicating and Crew Alerting System |
| ELT | Emergency Locator Transistor |
| EMER | Emergency |
| ENG | Engine |
| ESS | Essential |
| ETOPS | Extended Range Twin Engined Aircraft Operations |
| EXT PWR | External Power |
| FADEC | Full Authority Digital Engine Control |
| FCM | Flight Control Module |
| FD | Flight Director |
| FDAS | Flight Deck Alerting System |
| FG | Flight Guidance |
| FMA | Flight Mode Annunciation |
| FMCP | Flight Mode Control Panel |
| FMS | Flight Management System |
| FPV | Flight Path Vector |
| FR | Frame |
| FWD | Forward |
| FWD/AFT | Forward/Aft |
| GA | Go-Around |
| GEN | Generator |
| GLS | GPS Landing System |
| GND | Ground |
| GND SVC | Ground Service |
| GNSS | Global Navigation Satellite System |
| GPS | Global Positioning System |
| GPWS | Ground Proximity Warning System |
| GS | Glideslope / Ground Speed |
| HF | High Frequency |
| HUD | Head-Up Display |
| ICAO | International Civil Aviation Organization |
| ID | Identification |
| IDU | Integrated Display Unit |
| IGLS | ILS/GLS |
| ILS | Instrument Landing System |
| IRS | Inertial Reference System |
| IRU | Inertial Reference Unit |
| ISDT | Information System Display Terminal |
| ISI | Integrated Standby Instrument |
| L | Left |
| L DC | Left DC |
| L PACK | Left Pack |
| L TRU | Left Transformer Rectifier Unit |
| LAV | Lavatory |
| LED | Light Emitting Diode |
| LGCU | Landing Gear Control Unit |
| LGCV | Landing Gear Control Valve |
| LOC | Localizer |
| MAC | Mean Aerodynamic Chord |
| MB | Marker Beacon |
| MFD | Multiple Function Display |
| MKB | Multi-Functional Keyboard |
| MLG | Main Landing Gear |
| MMR | Multi-Mode Receiver |
| N1 | Engine low pressure rotor speed |
| N2 | Engine high pressure rotor speed |
| NACA | National Advisory Committee for Aeronautics |
| NAI | Nacelle Anti-Ice |
| NAV | Navigation |
| NCD | No Computer Data |
| ND | Navigation Display |
| NLG | Nose Landing Gear |
| NWS | Nose Wheel Steering |
| OMS | Onboard Maintenance System |
| OOOI | Out-Off-On-In |
| OVHD | Overhead |
| PF | Pilot Flying |
| PFCS | Primary Flight Control System |
| PFD | Primary Flight Display |
| PTU | Power Transfer Unit |
| PWM | Pulse Width Modulation |
| QAR | Quick Access Recorder |
| R | Right |
| R PACK | Right Pack |
| R TRU | Right Transformer Rectifier Unit |
| RA | Radio Altimeter |
| RAT | Ram Air Turbine |
| RAT GEN | Ram Air Turbine Generator |
| RNP | Required Navigation Performance |
| SAT | Static Air Temperature |
| SATCOM | Satellite Communication |
| SELCAL | Selective Calling |
| SOV | Shut Off Valve |
| SPKR | Speaker |
| STBY | Standby |
| SW | Switch |
| SYS | System |
| TAS | True Air Speed |
| TAT | Total Air Temperature |
| TAWS | Terrain Awareness and Warning System |
| TCAS | Traffic Alert and Collision Avoidance System |
| TCP | Trim Control Panel / Tuning Control Panel |
| TCP/IP | Transport Control Protocol/Internet Protocol |
| TCQ | Throttle Control Quadrant |
| TO | Take-Off |
| TOGA | Take-Off Go-Around |
| TRU | Transformer Rectifier Unit |
| UTC | Universal Time Coordinated |
| VFG | Variable Frequency Generator |
| VHF | Very High Frequency |
| VHF-NAV | Very High Frequency Navigation |
| VOR | VHF Omnidirectional Range |
| VPN | Virtual Private Network |
| VSD | Vertical Situation Display |
| WHC | Windshield Heater Controller |
| WHS | Windshield Heating System |
| WIFI | Wireless Fidelity |
| WLAN | Wireless Local Area Network |
| WOW | Weight On Wheel |
| WXR | Weather Radar |
| XFER | Transfer |
| XPDR | Transponder |