| Acronym | Meaning |
 | TCG | Time Code Generator |
| MT | Mount |
| PO | Personnel Office (KSC Directorate) |
| MACH | Machine |
| PR | PressureRegulator |
| OPO | Orbiter Project(s) Office |
| PRD | ProcurementRequirementsDocument |
| VX | Velocity Along The X-Axis |
| DFCS | Digital Flight Control Software (System) |
| M | Manual |
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