| Acronym | Meaning |
 | PACAS | Personnel Access Control Accountability System |
| SID | Standard Interface Document |
| ATC | Absolute Time Command |
| PFB | PayloadFeedback |
| FDS | Fluid Distribution System |
| PDB | Power Distribution Box |
| OMRF | Orbiter Modification And Refurbishment Facility |
| MPIIN | Modification Procurement Instrument Identification |
| COMPL | Completed |
| SWT | Sextant |
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