| Acronym | Meaning |
| TS | Timing System |
| DMSS | Data Management System Simulator (CVT) |
| IPS | IRD Information Requirements Document |
| USRA | Universities Space Research Association |
| OP | Oxygen Purge |
| TAP | Total Air Pressure |
| VSTAG | Vandenberg Shuttle Turnaround AnalYsis Group |
| LV | Lift Vector |
| SLEMU | SPacelab Engineering Model Unit |
| ECD | Estimated Completion Date |