| Acronym | Meaning |
 | PCA | Pneumatic Control Assembly |
| US | United States |
| OES | Orbiter Emergency Site |
| N/C | Normally Closed |
| ODES | Optical Discrimination Evaluation Study |
| N&G | Navigation And Guidance (G&N Preferred) |
| SESC | Shuttle Events Sequential Control |
| VEFCO | Vertical Functional Checkout |
| CSD | LCharles Stark Draper Laboratory (MIT) |
| PRESS | Pressurant |
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