A
Amber A
Alternate A/C
Aircraft A/D
Analog/Digital
A/DC
Analog-to-Digital Converter A/R
Audio Reproducer
A/SKID
Anti-Skid
A/THR
Autothrust
A/XFMR
Autotransformer
ABCU
Alternate Braking Control Unit AC
Alternating Current
ACARS
Aircraft Communication Addressing and Reporting System
ACC
Active Clearance Control
ACCEL
Acceleration/Accelerate
ACCLRM
Accelerometer
ACCU
ACCUMULATOR
ACMM
Abbreviated Component Maintenance Manual
ACMS
Aircraft Condition Monitoring System ACP
Area Call Panel ACP
Audio Control Panel
ACQN
Acquisition
ACSC
Air Conditioning System Controller ACT
Active
ACTR
Actuator
ADC
Air Data Computer ADF
Automatic Direction Finder
ADIRS
Air Data/Inertial Reference System
ADIRU
Air Data/Inertial Reference Unit
ADM
Air Data Module
ADR
Air Data Reference ADS
Air Data System
ADV
Advisory
AEVC
Avionics Equipment Ventilation Computer AF
Audio Frequency AFS
Automatic Flight System
AGB
Accessory Gearbox
AGC
Automatic Gain Control
AGL
Above Ground Level
AGW
Actual Gross Weight AIL
Aileron AIM
Aircraft Integrated Maintenance AIP
Attendant Indication Panel ALI
Airworthiness Limitation Item
ALIGN
Alignment ALT
Altitude
ALTM
Altimeter
ALTN
Alternate, Alternative AM
Amplitude Modulation
AMM
Aircraft Maintenance Manual
AMS
Aerospace Material Specification
AMU
Audio Management Unit ANI
Analog Input
ANN
Annunciator
ANN LT
Annunciator Light
ANO
Analog Output
ANT
Antenna
AOA
Angle-of-Attack
AOC