| Acronym | Meaning |
 | MWG | MMWG Maintenance Analyzer Working Group |
| IPS | IRAR Internal Variable |
| CDB | Central Data Buffer |
| SSO | Subsystem Operation (in Spacelab) |
| RAC | ReliabilitY Action Center |
| FCTB | Flight Crew Training Building |
| FPCA | Forward Power Controller Assembly |
| HUL | Hardware Utilization List |
| PERF | Perform |
| PWR | Power |
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