| Acronym | Meaning |
 | F/C | Fuel Cells |
| MIL | GSFC Spaceflight Tracking And Data Network Station |
| FTA | Fault Tree Analysis |
| ORB | 1 -g Orbiter One-g (trainer) |
| I | ECO Inboard Engine Cutoff |
| PCB | Printed Circuit Board |
| CAD | Computer Aided Design |
| HSF | Hypergot Servicing Facility |
| EC | Element Contractor |
| MMC | Martin Marietta Corporation |
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