| Acronym | Meaning |
 | HID | HIM Interface Distributor |
| MDRS | Manufacturing Data Retrieval System |
| PCDU | Payload Command Decoder Unit |
| ID | Identification |
| MU | Multiple Unit |
| MEIG | Main Engine Ignition |
| CSTR | Canister |
| OPPAR | Orbiter Project(s) Parts Authorization Request |
| U/C | Under Current |
| RAPS | Right AFT Propulsion System |
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