| Acronym | Meaning |
| I | FIntermediate Frequency |
| DD | Data Display |
| STSOPO | Shuttle Transportation Systems Operations Program |
| FB | Final Braking |
| IOB | InPut/Output Box |
| PCA | Pneumatic Control Assembly |
| IUE | Interface Unit Error Count Table |
| ISP | Instrumentation Support Plan |
| CEI | Configuration End Item |
| HDS | Hardware DescriPtion Sheet |