| Acronym | Meaning |
 | IPDR | Incremental Preliminary Design Review |
| RA | Range Area |
| RBN | Radio Beacon |
| SSPD | Shuttle System Payload Definition (Study) |
| SPAF | Simulation Processor And Formatter |
| CFP | Conceptual Flight Profile |
| RECRC | Recirculate |
| LC | LaunchCountdown |
| PM | PMAPPerformance Monitor Annunciation Panel |
| P | Primary |
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