| Acronym | Meaning |
 | IOB | InPut/Output Buffer (if Bus |
| R | Redundant |
| GCHX | Ground Cooling Heat Exchanger |
| RVDT | Rotary Variable Differential Transducer |
| MDS | Malfunction Detection System |
| GPA | General Purpose Amplifier |
| NDTF | Nondestructive Test Facility |
| HEAO | High Energy Astronomy Observatory |
| CFMF | Crip Flow Management Facility |
| MMU | Manned Maneuvering Unit |
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