| Acronym | Meaning |
 | PPF | Payload Processing Facility (USAF) |
| HFTS | Horizontal Flight Test Simulator |
| FDDB | Function Designator Data Base |
| A/L | Air Lock |
| DDR | Design Development Record |
| SCI | Switch Closure In |
| EWA | Estimated Warehouse Arrival |
| D | Delta |
| ICH | Interchanger |
| INT | Intensity |
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