| Acronym | Meaning |
 | GSA | General Services Administration |
| SSA | Shuttle Simulation Aircraft |
| MSBLS | Microwave Scanning Beam Landing System |
| PLDI | Payload Data Interleaver |
| FS | Fail To Sync |
| OS | OPtics Subsystem |
| EVSC | Extravehicular Suit Communications |
| M | ITTSE Mobile Lgor Tracking Telescope System |
| VOMD | VAFB Operations And Maintenance Documentation |
| LV | Loading Valve |
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