| Acronym | Meaning |
 | GCU | General Control Unit |
| OMEWG | Orbiter Maintenance Engineering Working Group |
| HC | Head Count |
| TSU | Time Standard Unit |
| CONUS | Continental United States |
| MT | Mechanical Technician |
| MTU | MobileTrainingUnit |
| ACRV | Assured Crew Return Vehicle |
| I | DAC Integrated Digital-Analog Converter |
| CARID | Customer Acceptance Review Item Disposition |
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