| Acronym | Meaning |
 | I | LAS Instrument Landing Approach System |
| PRTLS | Powered Return To Launch Site |
| SRSS | Shuttle Range Safety System |
| IGM | Interactive Guidance Mode |
| PWA | Private Write Area |
| OCC | Operations Control Center |
| LSSRC | Life Sciences Shuttle Research Centrifuge |
| IOB | InPut/Output Buffer |
| SFPPL | Short Form Provisioning Parts List |
| SA | Subaccount |
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