| Acronym | Meaning |
| MEIU | Main Engine Interface Unit |
| KEAS | Knots Equivalent Airspeed |
| SRO | Supervisor Range Operations |
| RCPT | Receptacle |
| IP | Instrumentation/pulse Code Modulation Master Unit Data Bus |
| CPCL | Computer Program Control Library |
| GPU | Ground Power Unit |
| PLGSS | Payload Ground Support Systems |
| OXY | Oxygen |
| HXIS | Hard X-ray Imaging Spectrometer |