| Acronym | Meaning |
 | CAR | Certification Approval Request |
| TDD | Task Description Document |
| FOD | Flight Operations Directorate (JSC) |
| OD | Outside Diameter |
| PRS | Power Reactant System (Subsystem) |
| VM | Voltmeter |
| CFSTI | Clearinghouse For Scientific And Technical Informatio |
| ESA | European Space Agency |
| OPOV | Oxidizer Preburner Oxidizer Valve |
| LUS | Liquid Upper Stage |
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