| Acronym | Meaning |
 | PRIM | Primary |
| TCS | Technical Concurrence Sheets |
| CAB | Cabinet |
| OPIS | Orbiter Prime Item Specification |
| MPLN | Maintenance Planning (Data Base) |
| FCTS | Flight Crew Trainer Simulator |
| SOLN | Solution |
| VSI | Vertical Speed Indicator |
| SCOE | Special Checkout Equipment |
| PCMMU | Pulse Code Modulation Master Unit |
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