| Acronym | Meaning |
| NCC | Network Control Center (GSFC) |
| QDS | Quality Data System |
| PWM | Pulse-Width Modulation |
| SPAN | Spacecraft Analysis |
| O | Engineering Order |
| VFO | Variable Frequency Oscillator |
| MDTSCO | McDonnell Douglas Technical Services Company |
| MMLS | Model-Modes-Loads-Stresses |
| PSF | Processing And Storage Facility (ET) |
| SCU | Sequence Control Unit |