| Acronym | Meaning |
| LCO | MMCUniform Central Number |
| LUB | Lubricate |
| CICU | Computer Interface Control Unit |
| PMC | Postmanufacturing Checkout |
| ILA | Instrument Landing Approach |
| SPCU | Simulation Process Control Unit |
| IPS | IRD Information Requirements Document |
| OAL | Overall Level |
| HPGS | High Pressure Gas System |
| FID | Failure Identification |