| Acronym | Meaning |
| SIPS | Small Instrument Pointing System |
| MPSR | Mission Profile Storage And Retrieval |
| GNCS | GuGNCSGuidance And Navi-oation Control System |
| LPW | Lumens Per Watt |
| DCU | Digital Computer Unit |
| RV | Relief Valve |
| MAD | Maintenance Analysis Data |
| PCOT | Payload Center Operations Team |
| CTSD | Coordinate Transformation SYstem |
| M50 | Mean Of 1950 (Coordinate System) |