| Abbreviation | Definition |
|---|---|
| APS | Air Purification System |
| APS | Airway Planning Standard |
| APS | Auxiliary Power System |
| APS | Aviation Performance Solutions |
| APSD | Aircraft Prototype Systems Division |
| APSI | Aircraft Propulsion Subsystem Integration |
| APSI | Aviation Professionals Sharing Information |
| APU | Auxillary Power Unit |
| APUC | APU Controller |
| AQD | Aviation Quality Database |
| AQP | Advanced Qualification Program |
| AQP | Aviation Quality Program |
| AQRD | Aerospace Quality Research & Development |
| AQS | Aviation Quality Services |
| AQT | Aviation Qualification Test |
| AR | Advance Revision |
| AR | Airworthiness Representative |
| AR | Approved Repair |
| AR | As Removed |
| AR | Authorized Representative |