| Acronym | Meaning |
 | FBS | Firefighters Breathing System |
| ESP | Electroshock Protection |
| MDT | Mean Down Time |
| ONBT | Orbiter Neutral Buoyancy Trainer |
| SRR | Site Readiness Review |
| TR | TechnicalReport |
| PDCR | Proprietary Data Control Record |
| LERC | Lewis Research Center (Cleveland |
| TVCS | Thrust Vector Control System |
| OSDH | Orbiter System Definition Handbook |
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