| Acronym | Meaning |
| DUPLX | Duplex |
| GCOS | Ground Computer Operating System |
| PDC | Predefined Command |
| FHS | Forward Heat Shield |
| MTGW | Maximum Total Gross Weight |
| POWS | Project Operating Work Statement |
| GBL | Government Bill Of Lading |
| UB | Upper Brace |
| RAM | Research And Applications Module |
| TCSSS | Thermal Control Subsystem Segment |