| Abbreviation | Definition |
|---|---|
| ACMS | Aircraft Condition Monitor System |
| ACMS | Aircraft Condition Monitoring System (also: DFDAU, DMU, FDAM) |
| ACN | Aircraft Classification Number |
| ACND | Air Conditioning |
| ACO | Aircraft Certification Office |
| ACO | Aircraft Certification Offices |
| ACOC | Air cooled oil cooler |
| ACP | Accomplished |
| ACP | Audio control panel |
| ACP | US-China Aviation Cooperation Program |
| ACPD | Aviation Consumer Protection Division |
| ACQI | Airport Connectivity Quality Index |
| ACR | Aerodrome Control Radar |
| ACR | Aviation Capacity Resources |
| ACRAD | Aviation Classification Repair Activity Depot |
| ACRB | Aviation Command Retention Bonus |
| ACRIS | Aviation Community Recommended Information Services |
| ACRM | Aviation Chief Radioman Military |
| ACS | Air Control System |
| ACS | AirCraft Spruce |