| Acronym | Meaning |
 | MTTF | Mean Time To Failure |
| EC | Engine Control |
| SPFA | Single Point Failure Analysis |
| OAFTO | Orbiter Atmospheric Flight Test Office |
| SCDR | Software Critical Design Review |
| EL | Electronic Interface |
| FRT | Flight Readiness Training |
| MEIU | Main Engine Interface Unit |
| PAD | Propellant Acquisition Device |
| UF | Microfarad |
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