| Acronym | Meaning |
 | HDST | Headset |
| SSDS | Space Station Data System |
| CALC | Calculate |
| ELS | Earth Landing System (Subsystem) |
| CKRA | Cape Kennedy Reference Atmosphere (Changed To CCR |
| OPDAR | OPtical Detection And Ranging |
| FD | Fault Detection |
| ET | Elapsed Time |
| OPF | Orbiter Processing Facility |
| OLSP | Orbiter Logistics Support Plan |
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