| Acronym | Meaning |
| HR | Hour |
| MBC | Maximum Breathing Capacity |
| NJP | NNJP Network Job Processing |
| MTS | Metric Time System |
| LCA | Launch Control Amplifier |
| IUS | Interim/intermediate UPper State |
| DBGMP | DBURData Bank Update Request |
| MD | Master Dimension |
| CAPS | Crew Altitude Protection System |
| HFX | High Frequency Transceiver |