| Acronym | Meaning |
 | DFRN | PRESSDifferential Pressure |
| F | Forward |
| EP | Environmental Protective Plan |
| RECT | Rectifier |
| SEC | Sequential Events Controller |
| BP | C-BDC-Band |
| VOR | VHF Omnidirectional Radio Range |
| MTCU | Magnetic Tape Control Unit |
| SIA | Shuttle Induced Atmosphere |
| LOR | Lunar Orbit Rendezvous |
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