A
A/C Air Conditioning
A/G Air/Ground
A/ICE Anti-ice
A/P Autopilot
A/S Airspeed
A/SKID Anti-skid
ABS Absolute
AC Alternating Current
ACARS ARINC Communications
Addressing and Reporting
System
ACCEL Acceleration, accelerate(d),
accelerometers
ACM Air Cycle Machine
ACMP Alternating Current Motor
Pump/Electric Hydraulic
Pump
ACPC Alternating Current Power
Center
ACSC Air Conditioning System
Controller
ACT Active
ACU Air Conditioning Unit
ACV Air Control Valve
ADC Air Data Computer
ADDR Address
ADF Automatic Direction Finder
ADI Attitude Director Indicator
ADS Air Data System
AFCS Automatic Flight Control
System
AFT Aftward
AGL Above Ground Level
AHC Attitude Heading Computer
AIL Aileron
ALIGN Aligning, alignment
ALPHA alpha
ALT Altitude, Altimeter
ALT Altitude Hold (PFD/FD)
ALT CAP Altitude Capture (PFD/FD)
ALT HOLD Altitude Hold
ALTN Alternate
ALTS Selected Altitude Arm/Abort
(PFD/FD)
AM Amplitude Modulation
AMB Ambient
AMP Amperes
ANNUN Annunciator
ANT Antenna
AOA Angle of Attack
AP Autopilot
APC Auxiliary Power Control
APP, APR Approach
APPROX Approximately
APU Auxiliary Power Unit
ARINC Aeronautical Radio
Incorporated
ARP Air Data Reference Panel
ASCB Avionic Standard
Communication Bus
ASYM Asymmetrical
AT Auto Throttle
ATA Air Transport Association
ATC Air Traffic Control
ATS Air Turbine Starter
ATT Attitude
ATTD Attitude
ATTND Attendant
AUTO Automatic
AUTO BAL Automatic Balance
AUTO XFER Automatic Transfer
AUX Auxiliary
AV Avionics
AVAIL Available
AZ Azimuth

B
B/AIR Bleed Air
B/C, BC Back Course
B/CRS Back Course
BCU Brake Control Unit
B/LEAK Bleed Leak
BARO Barometric
BAT Battery
BATT Battery
BDI Bearing Distance Indicator
BIT Built-In-Test
BITE Built-In-Test Equipment
BLD Bleed
BMC Bleed Management
Controller
BOOM Headset microphone
BRG Bearing
BRK Brake
BRKR(s) Breaker(s)
BRT Bright
BTL Bottle
BTMS Brake Temperature
Monitoring System
BTMU Brake Temperature
Monitoring Unit
BYPS Bypass
C
C Center, Caution, Cabin
CAA Civil Aviation Authority (UK)
CAI Cowl Anti-Ice
CAIMS Central Aircraft Information
Maintenance System
CAL Calibrate
CAP Capture
CAPT Captain
CAS Calibrated Air Speed, Crew
Alerting System
CAT Category
CAT II Category II
CB, C/B Circuit Breaker
CBP Circuit Breaker Panel
CCBP Cockpit Circuit Breaker Panel