| Acronym | Meaning |
 | PG | Pressure Gage |
| TC | Thermal Control |
| PREL | Preliminary |
| MECH | Mechanical |
| ORR | Operational Readiness Review |
| GSSC | Ground Support Simulation Computer |
| MTEF | Fluid Maintenance Test Equipment |
| CICU | Communication Interface Control Unit |
| CES | Crew Escape System |
| FSSR | Flight Systems Software Requirements |
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