A
AC Alternating Current
ACARS Aircraft Communications
Addressing and
Reporting System
ACP Audio Control Panel
ACT Active
ADF Automatic Direction
Finder
ADIRS Air Data Inertial
Reference System
ADIRU Air Data Inertial
Reference Unit
ADM Air Data Module
AFDS Autopilot Flight Director
System
AED Automatic External
Defibrillator
AFE Above Field Elevation
AFM Airplane Flight Manual
(FAA approved)
AGL Above Ground Level
AI Anti–Ice
AIL Aileron
ALT Altitude
ALTN Alternate
AM Amplitude Modulation
ANP Actual Navigation
Performance
ANT Antenna
AOA Angle of Attack
A/P Autopilot
APP Approach
APU Auxiliary Power Unit
ARINC Aeronautical Radio,
Incorporated
ARPT Airport
A/T Autothrottle
ATA Actual Time of Arrival
ATC Air Traffic Control
ATT Attitude
AUTO Automatic
AUX Auxiliary
AVAIL Available
B
BAC Back Course
BARO Barometric
B/CRS Back Course
BCS Back Course
BRT Bright

BTL DISCH Bottle Discharge (fire
extinguishers)
B/C Back Course
C
C Captain
Celsius
Center
CANC/
RCL
Cancel/Recall
CAPT Captain
CB Circuit Breaker
CDS Common Display System
CDU Control Display Unit
CG Center of Gravity
CHKL Checklist
CLB Climb
COMM Communication
CON Continuous
CONFIG Configuration
CRS Course
CRZ Cruise
CTL Control