Abbreviations
A
Antenna
AA
Antenna assembly
AAIM
Autonomous onboard integrity monitoring
AAS
Aircraft attitude sensor
ABAS
Airborne augmentation system
AC
Alternate current
ACR
Airfield control radar
AdC
Adding circuit
ADM
Antenna drive mechanism
ADP
Antenna directional pattern
ADSM
Antenna driving and stabilization mechanism
AFC
Automatic frequency (tuning) control
AFCS
Automatic flight control system
AFCU
Automatic frequency control unit
AFS
Antenna-feeder system
ADC
Analog-to-digital converter
AGC
Automatic gain (adjusting) control
AGI
Above ground installations
AI
Airborne instrument
AIS
Automatic identification system
AM
Amplitude-modulated
Amp
Amplifier
Anlz
Analyzer
APS
Angular position sensor
APV
Approach procedures with vertical guidance
ARB
Automatic radar beacon
ARC
Automatic radio compasses
ARPS
Automatic radar plotting system
AS
Antenna switch
ASCU
Antenna stabilization and control unit
AT
Auto-tracking
ATC
Air traffic control
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