| Acronym | Meaning |
 | O/D | Outside Diameter |
| PMC | Postmanufacturing Checkout |
| CRC | Contractor Recommended Code |
| SPCU | Simulation Process Control Unit |
| NASCOM | NASA Communications (Network) |
| HPOT | High-pressure Oxidizer Turbopump |
| I-LOAD | Initial-load |
| INSTRUM | Instrumentation Subsystem |
| DRSS | Discrepancy Report SquawkSheet |
| EC | Events Controller |
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