| Acronym | Meaning |
| LPD | Launch Procedure Document |
| TDRS | Tracking And Data Relay Satellite |
| MU | Multiple Unit |
| INTERFACE | Tool |
| TWTA | Traveling Wave Tube Amplifier |
| MTBR | Mean Time Between Replacement |
| RISKAC | Risk Acceptance |
| OPPL | Orbiter Project Parts List |
| IU | Instrument Unit |
| GCDC | Ground Checkout Display And Control |