| 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 |