| Acronym | Meaning |
 | OMC | Orbiter Maintenance And Checkout |
| G&NS | Guidance And Navigation Subsystem |
| PCB | Product Configuration Baseline |
| FIIG | Federal Item Identification Guide |
| BAC | Boeing Aircraft Company |
| EKG | Electrocardiogram (Record) |
| IE | Industrial Engineering |
| MCA | Master ControlAssembly |
| PCZ | Physical Control Zone |
| RTCS | Real-Time Computer System |
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