| Acronym | Meaning |
| R | Reliability |
| ETLOW | External Tank Lift-Off Weight |
| MCP | Materials Control Plan |
| VEFCO | Vertical Functional Checkout |
| OIA | Orbiter Interface Adapter |
| EXPEN | Expendable |
| RAAB | Remote Amplifier Acquisition And Advisory Box |
| PUCS | Propellant Utilization Control System |
| SDRD | SuPplier Documentation Review Data |
| LS/ST | Light Shield/Star Tracker |