| Acronym | Meaning |
 | IED | Interacting Equipment Documents |
| SF | Safe |
| ISTA | Intertank Structural Test Assembly |
| RMF | RCS Module Forward |
| OMRF | Orbiter Modification And Refurbishment Facility |
| MB | Millibar |
| NCR | Nonconformance/Failure Report |
| HEAO | High Energy Astronomy Observatory |
| VCU | Video Control Unit |
| FMEC | Forward Master Events Controller |
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