| Acronym | Meaning |
 | TP | Transition Period (T.P. Preferred) |
| PMS | Performance Monitoring System |
| DMC | Data Management ComPuter |
| RPS | Record And Playback System (Subsystem) |
| DCS | Data Control System |
| GTA | Ground Test Access |
| HFDS | Hydrogen Fluid Distribution System |
| ISS | Installation Support Services |
| PPM | Pulse Per Minute |
| EPS | Electrical Power System |
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