| Acronym | Meaning |
| OPL | Operational |
| DCS | Detail Checkout Specification(s) |
| IFRU | In-Flight Replacement Unit |
| MTBM | Mean Time Between Maintenance |
| MAPS | Measurement Of Air Pollution From Satellites |
| RFL | Reflect |
| PBS | Protective Breathing System |
| NSR | Nominal SlowRate |
| FEP | Fluorinated Ethylene Propylene |
| USEC | Microsecond |