| Acronym | Meaning |
 | MSI | Maintenance Significant Items |
| PDI | Payload DePloyment And Retrieval System |
| SCM | System Control Module |
| MAT | Meteorological Atmospheric Turbulence |
| MCU | Mission Control Unit |
| FCS | Flight Control System |
| BLK | Block |
| FDA | Fault Detection And Annunciation |
| SDF | Safing And Deservicing Facility |
| ACRC | Assured Crew Return Capability - Now ACRV |
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