| Acronym | Meaning |
 | ELF | Extremely Low Frequency (1 Hz To 3 KHz) |
| SCFM | Standard Cubic Feet Per Minute |
| DFI | Development Flight Instrumentation |
| PIP | Plant Instrumentation Program |
| PDCR | Proprietary Data Control Record |
| PCMD | Pulse-Code Modulation |
| FSS | Flight Support System |
| OME | Orbital Main Engine |
| SPA | Signal Processor Assembly |
| E | LSSEmergency Life Support System |
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