| Acronym | Meaning |
 | PRSD | Power Reactant Supply And Distribution |
| SDPC | Shuttle Data Processing Complex |
| PSA | PowerServoAssembly |
| EPDU | Electrical Power Distribution Unit |
| ESVS | Escape Suit Ventilation System |
| PCIN | Program Change Identification Number |
| R | Ratio |
| IOB | InPut/Output Box |
| DODD | Department Of Defense Directive |
| ODR | OutPut Data Redundancy |
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