| Acronym | Meaning |
 | GH2 | Gaseous Hydrogen |
| SPD | Standard Practice Directive |
| RDS | Rocketdyne Digital Simulator |
| GTCU | Ground Thermal Conditioning Unit |
| RTHC | Rotation-Translation Hand Controller |
| LHE | Liquid Helium |
| SCS | Spacecraft Control System |
| SHTR | Shutter |
| RIF | Relative Importance Factor |
| PHMC | Probe Heater Motor Controller |
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