| ACAS /TCAS |
Airborne or Traffic Collision Avoidance System. These will have a further descriptor of 'RA' - Resolution Advisory or 'TA' - Traffic Advisory |
| ADS-B/C |
Automatic Dependent Surveillance - Broadcast / Contract |
| AGL |
Above Ground Level |
| AHRS |
Attitude & Heading Reference System |
| AMSL |
Above Mean Sea Level |
| APU |
Auxiliary Power Unit |
| ATC |
Air Traffic Control |
| ATIS |
Automatic Terminal Information Service |
| CPDLC |
Controller Pilot Data Link Communications |
| CTA |
Control Area |
| CTAF |
Common Traffic Advisory Frequency |
| CTR |
Control Zone |
| DME |
Distance Measuring Equipment |
| ECAM |
Electronic Centralised Aircraft Monitor |
| E/GPWS |
Enhanced / Ground Proximity Warning System |
| EICAS |
Engine Indicating and Crew Alerting System |
| ELT |
Emergency Locator Transmitter (sometimes referred to as an ELB - Emergency Locator Beacon or PLB - Personal Locator beacon) |
| FDR |
Flight data recorder |
| FL |
Flight Level |
| FMS |
Flight Management System (covers FMCG & FMC) |
| ft |
Feet |
| GPS |
Global Positioning System |
| GNSS |
Global Navigation Satellite System |
| HF |
High Frequency |
| IAS |
Indicated Air Speed |
| IFR |
Instrument Flight Rules |
| ILS |
Instrument Landing System |
| IMC |
Instrument Meteorological Conditions |
| IVA |
Independent Visual Approach |
| kt |
Knots |
| LAHSO |
Land and Hold Short Operations |
| m |
Metres |
| MAYDAY |
Radio transmission from flight crew indicating potential life threatening emergency |
| MEL |
Minimum Equipment List |
| MFD |
Multi-Function Display |
| NDB |
Non Directional Beacon |
| NM |
Nautical Mile |
| NOTAM |
Notice to Airmen |
| NVFR |
Night Visual Flight Rules |
| NVG |
Night Vision Goggles |
| OCTA |
Outside Controlled Airspace |
| PAL |
Pilot Activated Lighting |
| PAN |
Radio transmission from flight crew indicating an uncertainty or alert |
| PAPI |
Precision Approach Path Indicator |
| PFD |
Primary Flight Display |
| RNAV |
Area Navigation |
| RNP |
Required Navigation Performance |
| RPA/S |
Remotely Piloted Aircraft / System |
| RPM |
Revolutions Per Minute |
| RVSM |
Reduced Vertical Separation Minima |
| SARTIME |
Latest expected arrival at destination as planned by flight crew |
| SID |
Standard Instrument Departure |
| STAR |
Standard Arrival Route |
| STCA |
Short Term Conflict Alert |
| TAAATS |
The Australian Advanced Air Traffic System |
| TAF |
Terminal Area Forecast |
| VFR |
Visual Flight Rules |
| VHF |
Very High Frequency |
| VMC |
Visual Meteorological Conditions |
| VOR |
VHF Omni-directional Radio Range |
