| Acronym | Meaning |
 | NSR | Nominal SlowRate |
| ECS | Engine Control SYstem |
| SRD | SYstems Requirements Document |
| FCI | Functional Configuration Identification |
| OTD | Orbiter Test Director |
| DPA | Data Processing Assembly |
| FPOV | Fuel Preburner Oxidizer Valve |
| H | EPAHigh Efficiency Particle Air (Filter) |
| DIPL | Display Initial Program Load |
| FDM | Frequency Division Multiplexing |
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