| Acronym | Meaning |
 | PCC | Payload Control And Checkout |
| FDI | Failure Detector Indicator |
| GSFC | Goddard Space Flight Center |
| OPPL | Orbiter Project Parts List |
| OA | Output Axis |
| USS | United States Ship |
| MEC | Mission Events Controller |
| MF | Midfuselage |
| RPS | Revolutions Per Second |
| FSL | Flight Simulation Laboratory |
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