| Acronym | Meaning |
 | RPA | Request For Procurement Action (Authorization) |
| UL | Upper Limit |
| EIFA | Element Interface Functional Analysis |
| PROM | Progammable Read-only Memory |
| FCOS | Flight Computer Operating System (Orbiter) |
| NTO | NitrogenTetroxide |
| EETB | Electronic Electrical Termination Building |
| WAD | Work Authorization Document/Shop Order |
| GATT | Gate Assisted Turnoff Thyristor |
| PARAM | Parameter |
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