Analog To Digital
Autopilot
Aircraft-Based Augmentation System
ADS Broadcast
Advisory Circular
Airborne Collision Avoidance System
Aircraft Communications Addressing And Reporting System
Area Control Center
Actuator Control Electronics
Aircraft Condition Monitoring System
Aircraft Certification Office (typically FAA, e.g. USA)
Audio Control Panel
Audio Control System
Airworthiness Directive
Air Data And Attitude Heading Reference System
Air Data Computer, or Analog-To-Digital Converter
Automatic Direction Finder
Attitude Director Indicator
Air Data Inertial Reference System
Air Data Inertial Reference Unit
Air Data Module
Airborne Data Reception
Automatic Dependent Surveillance
Automatic Dependent Surveillance-Address
Automatic Dependent Surveillance-Broadcast
Automatic Dependent Surveillance-Contract
Airborne Electronic Hardware
Active Electronically Scanned Array
Automatic Flight Control System
Autopilot Flight Director
Autopilot Flight Director Computer
Autopilot Flight Director System
Avionics Full-Duplex Switched Ethernet
Automatic Ground
Air-Ground Data Link
Attitude Heading Control
Attitude Heading Reference System
Aircraft Integrated Data
Aeronautical Information Manual
Aeronautical Information Publication
Aerospace Information Report
Airmen’s Information System
Assurance Level
Altitude
Acceptable Means of Compliance
Air Management System
Active Noise Cancellation
Annunciator
Active Noise Reduction
American National Standards Institute
Antenna
Aeronautical Operational Control
Airport Operating Plan
Aircraft Owners And Pilots Association
Automatic Pressure Altitude Reporting System
Auto Pilot System
Auxiliary Power Unit
Approach With Vertical Guidance
Aeronautical Radio, Inc.
Aerospace Recommended Practice (via Society of Automotive & Aerospace Engineers)
Aircraft Situation Display
Aeronautical Satellite Data Link
Application Specific Integrated Circuit
Airport Surveillance Radar
All Purpose Structured Eurocontrol Surveillance Information Exchange
Avionics Switching Unit
Auto Throttle
Amended Type Certificate
Air Traffic Control
Air Traffic Control Radar Beacon System
Air Traffic Control Signaling System
Airport Traffic Control Tower
Automated Terminal Information Service
Air Traffic Management
Air Traffic Service
Airborne Traffic Situational Awareness
Air Traffic Services Unit
Attitude
Aviation Electronics
Office Of Aviation System Standards
Advanced Warning And Control Systems
Automated Weather Observation System
For the remainder of this list, B’s through Z’s, request a free download HERE.