| Acronym | Meaning |
 | PM | PMADPerformance Monitor Annunciation Driver |
| HRPS | Hazard Reduction Precedence Sequence |
| MTEO | Optical Maintenance Test Equipment |
| TESH | Technical Shop |
| ESRO | European Space Research Organization |
| IAL | Immediate Action Letter |
| FVV | Facility Verification Vehicle |
| IGOR | Intercept Ground OPtical Recorder |
| RTG | Radioisotope Thermoelectric Generator |
| OBS | Observe |
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