A  Amber  AOC  Airline Operational Control 
A  Alternate  AP  Autopilot 
A/C  Aircraft  AP/FD  Autopilot/Flight Director 
A/D  Analog/Digital  APPR  Approach 
A/DC  Analog-to-Digital Converter  APPU  Asymmetry Position Pick Off Unit 
A/R  Audio Reproducer  APU  Auxiliary Power Unit 
A/SKID  Anti-Skid  ARINC  Aeronautical Radio Incorporated 
A/THR  Autothrust  ARPT  Airport 
A/XFMR  Autotransformer  ASCII  American Standard Code for Information Interchange 
ABCU  Alternate Braking Control Unit  ASI  Airspeed Indicator 
AC  Alternating Current  ASIC  Application Specific Integrated Circuits 
ACARS  Aircraft Communication Addressing and Reporting System  ASM  Aircraft Schematics Manual 
ACC  Active Clearance Control  ASP  Audio Selector Panel 
ACCEL  Acceleration/Accelerate  ASSY  Assembly 
ACCLRM  Accelerometer  ATA  Air Transport Association of America 
ACCU  ACCUMULATOR  ATC  Air Traffic Control 
ACMM  Abbreviated Component Maintenance Manual  ATE  Automatic Test Equipment 
ACMS  Aircraft Condition Monitoring System  ATLAS  Abbreviated Test Language for All Systems 
ACP  Area Call Panel  ATS  Autothrottle System 
ACP  Audio Control Panel  ATSU  Air Traffic Service Unit 
ACQN  Acquisition  ATT  Attitude 
ACSC  Air Conditioning System Controller  ATTND  Attendant 
ACT  Active  AUTO  Automatic 
ACTR  Actuator  AUX  Auxiliary 
ADC  Air Data Computer  AVAIL  Available 
ADF  Automatic Direction Finder  AVNCS  Avionics 
ADIRS  Air Data/Inertial Reference System  AWM  Aircraft Wiring Manual 
ADIRU  Air Data/Inertial Reference Unit  AWY  Airway 
ADM  Air Data Module  AZ  Azimuth 
ADR  Air Data Reference  B  Blue 
ADS  Air Data System  BARO  Barometric 
ADV  Advisory  BAT  Battery 
AEVC  Avionics Equipment Ventilation Computer  BCD  Binary Coded Decimal 
AF  Audio Frequency  BCL  Battery Charge Limiter 
AFS  Automatic Flight System  BFO  Beat Frequency Oscillator 
AGB  Accessory Gearbox  BGM  Boarding Music 
AGC  Automatic Gain Control  BITE  Built-in Test Equipment 
AGL  Above Ground Level  BMC  Bleed Monitoring Computer 
AGW  Actual Gross Weight  BNR  Binary 
AIL  Aileron  BOT  Begin of Tape 
AIM  Aircraft Integrated Maintenance  BP  Bottom Plug 
AIP  Attendant Indication Panel  BRG  Bearing 
ALI  Airworthiness Limitation Item  BRK  Brake 
ALIGN  Alignment  BRKR  Breaker 
ALT  Altitude  BRKT  Bracket 
ALTM  Altimeter  BRT  Bright, Brightness 
ALTN  Alternate, Alternative  BSCU  Braking/Steering Control Unit 
AM  Amplitude Modulation  BTC  Bus Tie Contactor 
AMM  Aircraft Maintenance Manual  BTMU  Brake Temperature Monitoring Unit 
AMS  Aerospace Material Specification  BTN  Button 
AMU  Audio Management Unit  BTR  Bus Tie Relay 
ANI  Analog Input  BU  Battery Unit 
ANN  Annunciator  BUS  Busbar 
ANN LT  Annunciator Light  BYDU  Back-Up Yaw Damper Unit 
ANO  Analog Output  C  Close , Celsius, Centigrade
ANT  Antenna  C/B  Circuit Breaker Circuit Breaker 
AOA  Angle-of-Attack  C/L  Check List 
CAB  Cabin  CSU  Command Sensor Unit 
CAM  Cabin Assignment Module  CT  Current Transformer 
CAPT  Captain  CTL  Central 
CAS  Calibrated Air Speed  CTL  Control 
CAUT  Caution  CTR  Center 
CAUT LT  Caution Light  CU  Control Unit 
CBMS  Circuit Breaker Monitoring System  CUDU  Current Unbalance Detection Unit 
CBMU  Circuit Breaker Monitoring Unit  CUR  Current 
CCS  Cabin Communications System  CVR  Cockpit Voice Recorder 
CCW  Counter Clockwise  CVT  Center Vent Tube 
CDP  Compressor Discharge Pressure  CW  Clockwise 
CDU  Control and Display Unit  D/D  Engine Out Drift Down Point 
CFDIU  Centralized Fault Display Interface Unit  D/O  Description and Operation 
 
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