| Acronym | Meaning |
| MPS | Main Propulsion System (Subsystem) |
| OBS | Operational Biomedical System |
| PS | Payload Support |
| KAU | Kilo Accounting Unit |
| S/8 | Standby |
| IMDB | Integrated Maintenance Data Base |
| OFS | OrbiterFunctionalSimulator |
| F/A | Fuel-Air |
| SCFS | Standard Cubic Feed Per Second |
| DRL | Document Requirements List |