ACAS Airborne Collision Avoidance System
ADC Air Data Computer
ADF Automatic Direction Finder
ADS Air Data System
AFD Adaptive Flight Display
AGL Above Ground Level
AHC Attitude Heading Computer
AHRS Attitude Heading Reference System
AIS Audio Integrating System
AOA Angle of Attack
AP Autopilot
ATC Air Traffic Control
ATT Attitude
BAT Battery
BRG Bearing
CAUT Caution
C/B Circuit Breaker
CCP Cursor Control Panel
CDU Control Display Unit
COM,
COMM
Communications
CPAS Collins Portable Access System
CPCS Cabin Pressure Control System
CWTS Control Wheel Trim Swtches
DBU Database Unit
DCP Display Control Panel
DCU Data Concentration Unit
DG Directional Gyro
DH Decision Height
DME Distance Measuring Equipment
ECS Environmental Control System

ECU External Compensation Unit
EDC Engine Data Concentrator