| Acronym | Meaning |
 | ATCS | Active Thermal Control System |
| VL | Expendable Vehicles (KSC VO Dir.) |
| MEC | Mission Events Controller |
| HMC | Hypergolic Maintenance And Checkout |
| HPU | Hydraulic Power Unit |
| DRB | Design Requirements Baseline |
| MYTA | MMYTAMaintainability Task Analyses |
| HRS | Hours |
| PSP | Payload Support Plan |
| CNTR | Counter |
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