| Acronym | Meaning |
 | PAD | Propellant Acquisition Device |
| GSO | Ground Systems Operations |
| ESTEC | European Space Technology Center |
| MC | Mission Capability |
| ELMCH | Electromechanical |
| QVT | Qualified Verification Testing |
| SPART | Space ResearchandTechnology |
| GCU | Generator Control Unit |
| OIS | Orbiter Instrumentation Systems |
| ST | Sequential Timer |
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