| 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 |