| Acronym | Meaning |
 | PSID | Pounds Per Square Inch Differential |
| HWWS | Hyperfiltration Wash Water Recovery System |
| DISENG | Disengage |
| PVA | Propellant Valve Actuator |
| RPM | Revolutions Per Minute |
| PR | ProblemReport |
| DISC | Discrete |
| PRD | Procurement Regulation Directive |
| ELMS | Elastic Loop Mobility System |
| FSW | Flight Software |
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