| 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 |