| Acronym | Meaning |
| PCU | Process Control Unit |
| NET | PositivNet Positive Suction Pressure |
| CONUS | Continental United States |
| DAS | Data Acquisition System |
| MTGW | Maximum Total Gross Weight |
| TSRA | Total System Requirements Analysis |
| CBC | Complete Blood Count |
| EDU | Engineering DeveloPment Unit |
| TDRSS | Tracking And Data Relay Satellite System |
| NI | NNi Nickel |