| Acronym | Meaning |
 | TVCA | Thrust Vector Control Actuator |
| IDU | Interface Demonstration Unit |
| MSW | Microswitch |
| MIT | Master InstructionTape |
| BOS | Backup Operating System |
| OUT | Orbiter Utilities Tray |
| DM | DeveloPmental Instrumentation MDM.Mid |
| CCS | Console Communication System |
| WOW | Weight On Wheels |
| CDF | Circuit Design Fabrication |
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