| Acronym | Meaning |
 | FQ | Flight Qualification |
| ICDR | Incremental Critical Design Review |
| MSC | Manned Spacecraft Center (changed To JSC) |
| T/R | Transmit/Receive |
| PSST | Periodic Significant Scheduled Tasks |
| MSS | Mechanical Support Systems |
| GNCS | GuGNCSGuidance And Navi-oation Control System |
| FPBOV | Fuel Preburner And Oxidizer Valve |
| OLOW | Orbiter Lift-off Weight |
| OMS | Orbital Maneuvering System |
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