| Acronym | Meaning |
 | GCOS | Ground Computer Operating System |
| R/S | RedundantSet |
| S&AD | Science And Applications Directorate |
| PCT | Percent |
| OMMH | Orbiter Maintenance Man-Hours |
| MMSE | Multiuse Mission Support Equipment |
| MAT | Meteorological Atmospheric Turbulence |
| W/O | Without |
| PDR | Processed Data Recorder |
| DCIU | Digital Control And Interface Unit |
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