ANN LT  Annunciator Light 
ANNCE  Announce 
ANNCMT  Announcement 
ANO  Analog Output 
ANPT  Aeronautical National Taper Pipe Threads 
ANSA  At Nearest Suitable Airport 
ANSI  American National Standards Institute 
ANSU  Aircraft Network Server Unit 
ANT  Antenna 
ANU  Aircraft Nose Up 
AO  Access Opening 
AOA  Angle Of Attack 
AOAS  Angle of Attack Sensor 
AOC  Airline Operational Control 
AOC  Air Operator's Certificate 
AOD  Audio on Demand 
AOG  Aircraft On Ground 
AOHX  Air/Oil Heat Exchanger 
AOLS  Airbus On-Line Services 
AOM  Aircraft Operating Manual 
AOMT  Airbus Onboard Maintenance Tool 
AOP  Airbus Operational Plan 
AOT  All Operator Telex 
AP  Airbus Procedure 
AP  Autopilot 
AP  Airborne Printer 
APASHE  Aircraft Publication Automated Shipping Expedite 
APC  Area Positive Control 
API  Application Programming Interface 
APLC  Aircraft Power Line Conditioner 
APM  ARINC Processing Module 
APM  Airport Planning Manual 
APM  Aircraft Performance Monitoring Program 
APP  Approach Control-Approach Control Office 
APP  Appearance 
APPL  Application 
APPR  Approach 
APPROX  Approximately 
APPU  Asymmetry Position Pick Off Unit 
APQ  Airline Pre-Qualification 
APS  Aircraft Prepared for Service 
APS  Auxiliary Power Supply 
APS  Avionic Printing Specification 
APS  Absolute Pressure Sensor 
APU  Auxiliary Power Unit 
APU AFE  APU Automatic Fire Extinguishing Control Unit 
AP/FD  Autopilot/Flight Director 
AQP  Advanced Qualification Program 
AR  As Required 
AR  Audio Reproducer 
ARC  Air Refueling Computer 
ARG  Arresting Gear or Hook 
ARINC  Aeronautical Radio Incorporated 
ARM  Airworthiness Review Meeting 

ARM  Aircraft Recovery Manual 
ARMD  Armed 
ARMG  Arming 
ARMT  Armament 
ARN  Aircraft Registration Number 
ARND  Around 
ARO  After Receipt Order