| Acronym | Meaning |
 | OPR | Oxygen Pressure Regulator |
| ILC | Initial Launch Capability |
| SECS | Shuttle Events Control |
| FCEF | Flight Crew Equipment Facility |
| EIU | Engine Interface Unit |
| R | Rankine |
| SCIU | Spacecraft Interface Unit |
| RDC | Reference Designator Code |
| LSID | Launch Sequence And Interlock Document |
| SDP | Supplier Data Package |
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