| Acronym | Meaning |
 | VSO | Very Stable Oscillator |
| SRCB | Software Requirements Change Board |
| DFCS | Digital Flight Control Software (System) |
| OEAS | Orbital Emergency Arresting System |
| EHS | Environmental Health Services |
| PMPL | Preferred Mechanical Parts List |
| MDS | Malfunction Detection System |
| SR | Scan Ratio |
| HYD | Hydraulic Subsystem |
| RFA | RF Authorization (Frequency) |
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