| Acronym | Meaning |
| PASS | Primary Avionics Software System |
| T | Total Temperature |
| IWG | Investigator Working Group |
| GUID | Guidance |
| TSRA | Total System Requirements Analysis |
| ESTA | Electronic System Test Equipment |
| DAS | Data Analysis Station |
| NW | Nose Wheel |
| N2O4 | Nitrogen Tetroxide |
| OMB | Office Of Management And Budget |