| Acronym | Meaning |
 | PBDF | Payload Bay Door FWD |
| Q | Dynamic Pressure |
| TT | Total Temperature |
| VU | VolumeUnit |
| FCS | Federal Communications System |
| CDSC | Communications Distribution And Switching Center |
| COMR&DSAT | Communication Research And Development Satellite |
| IPACS | Integrated Power And Attitude Control System |
| BSI | Basic Shipping Instructions |
| ISC | Johnson Space Center (formerly MSC) |
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