| Acronym | Meaning |
 | HRT | High Resolution Tracker |
| VOT | VHF Omni Test |
| VASI | Visual Approach Slope Indicator |
| LRSI | Low Temperature Reusable Surface Insulation |
| HCSI | Hughes Communications Services |
| QPSK | Quadrature Phase Shift Key |
| OUT | Orbiter Utilities Tray |
| RDR | Rudder |
| TX | Translation Hand Controller X-Axis Direction |
| DDS | Data Display System |
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