Acronyms

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

Superseded Acronyms

*AIRPROX	An aircraft comes into such close proximity with another aircraft, terrain, person or object where immediate evasive action was required or should have been taken either airborne or on the ground.
*ALERFA	Alert phase
*ARO	Acts, Regs and Order
*ASIR	Air Safety Incident Report
*ATSB	Australian Transport Safety Bureau
*AusFIC	Australian Flight Information Centre
*AusSAR	Australian Search and Rescue
*BOS	Breakdown of Separation
*CASA	Civil Aviation Safety Authority
*CAVOK	Visibility, cloud and present weather better than prescribed values or conditions
*CENSAR	Centralised SARTIME Database
*DETRESFA	Distress phase
*ESIR	Electronic Safety Incident Report
*ETA	Estimated time of arrival
*ETD	Estimated time of departure
FIR	Flight information region
*ft/min	Feet per minute
*FTC	Failure to Comply
*GAAP	General Aviation Airport Procedures
*INCERFA	Uncertainty phase
*LLZ	Localiser
*MBZ	Mandatory Broadcast Zone
*NAIPS	National Aeronautical Information Processing System
*OASIS	Occurrence Analysis and Safety Information System
*OKTA	Eighths of sky cover
*RFFS	Rescue and fire fighting service
*RIS	Radar Information Service
*SAR	Search and Rescue
*SATCOM	Satellite Communication
*SSR	Secondary Surveillance Radar
*UHF	Ultra high frequency
*VCA	Violation of controlled airspace
*VEC	Visual En-route Chart