| Acronym | Meaning |
 | FL | Feed Lines |
| SCA | Sequence Control Assembly |
| LPTTL | Low Power Transistor-Transistor Logic |
| FERD | Facility And Equipment Requirements Document |
| UP | Upper |
| LVDT | Linear Voltage Differential Transformer |
| OCDU | Optics Coupling Data Unit (G&N) |
| PPF | Payload Processing Facility (USAF) |
| TOW | Tank And Orbiter Weight |
| CR | Control Room |
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