| Acronym | Meaning |
 | SD | Specification Document |
| PDU | Pressure Distribution Unit |
| SSI | Significant Structural Item |
| VAA | Viewpoint Adapter Assembly |
| DDAS | Digital Data Acquisition System |
| MAB | Master Acquisition Bus |
| MA&T | Manufacturing Assembly And Test |
| CWEU | Caution And Warning Electronics Unit |
| SMB | Space Meteorology Branch |
| OAMS | Orbital Attitude And Maneuvering System |
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