| Acronym | Meaning |
| VOR | VHF Omnidirectional Radio Range |
| TE | Timing Electronics |
| BP | C/RCommutation Rate |
| PGNCS | Primary G&N And Control System (Subsystem) |
| HFX | High Frequency Transceiver |
| EAM | Electrical Accounting Machine |
| MCC-H | Mission Control Center-Houston |
| CMACS | Central Monitor And Control System |
| MAB | Mechanical Automation Breadboard |
| PFK | Payload Function Key |