Let us learn about the abbrevations used in aviation, aerospace and aeronautical sector

A
Abrev Term
A/C aircraft
ACAS Airborne Collision Avoidance System
ACARS Aircraft Communication and Addressing Reporting System
ACMS Aircraft Condition Monitoring System
ACC Active Clearance Control
AD Airworthiness Directive
ADC Air Data Computer
ADF Automatic Direction Finder
ADI Attitude Director Indicator
ADS Automatic Dependent Surveillance
AFCS Automatic Flight Control System
AFDS Autopilot Flight Director System
AFS Aeronautical Fixed Service
A/D aerodrome
agl Above ground level
AHRS Attitude Heading Reference System
AIP Aeronautical Information Publication
ALS Approach Lighting System
AMSL Above Mean Sea Level
ANSP Air Navigation Service Provider
AOA Angle of Attack
AOC Air Operator's Certificate
AOM Airport/Aerodrome Operating Minima
APU Auxiliary Power Unit
A/P airplane (US), aeroplane (ICAO)
ARINC Aeronautical Radio Inc.
ARTCC Air Route Traffic Control Centers
ASDA Association for Scientific Development of Air Traffic Management in Europe
ASAS Airborne Separation Assurance System
ASI Airspeed Indicator
asl Above sea level
ASM Airspace management
ATA Air Traffic Association
ATC Air Traffic Control
ATFM Air Traffic Flow Management
ATIS Automatic Terminal Information Service
ATM Air Traffic Management
AT-One Strategic Alliance between DLR and NLR on ATM research and development
ATPL Airline Transport Pilot Licence
ATS Air Traffic Services

B
Abrev Term
BC Back Course
BFH Big F*cking Hammer

C
Abrev Term
CAA Civil Aviation Authority
CAS Calibrated airspeed
CFIT Controlled Flight Into Terrain
CG Center of Gravity
CMV Converted Meteorological Visibility
CPDLC Controller Pilot Data Link Communications
CTAF Common Traffic Advisory Frequency
CVR Cockpit Voice Recorder

D
Abrev Term
DA/H Decision Altitude / Height (rel. to THR) See Instrument Landing System
DER Departure End of Runway
DG Directional Gyro
DLR German Aerospace Center / Deutsches Zentrum für Luft- und Raumfahrt e.V.
DME Distance Measuring Equipment
DR Dead reckoning

E
Abrev Term
EAS Equivalent airspeed
ECAM Electronic Centralised Aircraft Monitor
ECET End of civil evening twilight
EICAS Engine Indicator and Crew Alert System
E-LSA Experimental light-sport aircraft
ELT Emergency Locator Transmitter
EPR Engine Pressure Ratio
ESA Emergency Safe Altitude
EFIS Electronic Flight Instrument System

F
Abrev Term
FADEC Full Authority Digital Engine Control
FAF Final Approach Fix
FANS Future Air Navigation System
FAP Final Approach Point
FEP Final End Point
FDR Flight Data Recorder (also known as black box)
FIR Flight Information Region
FL Flight Level
FMC Flight Management Computer (same as FMS)
FMS Flight Management System
FPL Filed Flight Plan
FMC Flight Management Computer
FSF Flight Safety Foundation
FSS Flight Service Station

G
Abrev Term
GCA Ground-controlled approach
GLOC g-Induced Loss of Consciousness, where g is acceleration relevant to the acceleration caused by gravity
GND Ground
GP Glide Path
GPS Global Positioning System
GPWS Ground Proximity Warning System
EGPWS Enhanced Ground Proximity Warning System
GA Go-Around
GS Glideslope
GSE Ground Support Equipment

H
Abrev Term
H Heavy
HDG Heading
HL Height Loss
HPA Human Powered Aircraft
HSI Horizontal Situation Indicator
HUD Head-up display

will be continued