| Acronym | Meaning |
| TDD | Task Description Document |
| IVAR | Internal Variable |
| SDM | Subsystem Design Manuals |
| NLG | Nose Landing Gear |
| SEADS | Shuttle Entry Air Data System |
| STM | Signal Termination Module |
| MTBR | Mean Time Between Replacement |
| SSFS | Space Shuttle Functional Simulator |
| SPF | Spacelab Processing Facility |
| DAIS | Data Avionics Information System |