| Acronym | Meaning |
 | HD | Hydrogen Drain |
| NASA | National Aeronautics And Space Administration |
| SHDN | Shutdown |
| RIT | Request For Interface Tool |
| RBL | Right Buttock Line |
| MIO | Management Integration Office |
| S/M | Structural/Mechanical |
| QAR | Quality Assurance Responsible/Witness |
| OVHT | Overheat |
| WMC | Waste Management Compartment |
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