| Acronym | Meaning |
 | OBS | Observe |
 | UNDK | Undock |
 | PSIA | Pound Per Square Inch Absolute |
 | IITCS | Igloo Internal Thermal Control Section |
 | FM | Flight Model |
 | ALAE | Atmospheric Lyman Alpha Experiment |
 | MPS | Main Propulsion System (Subsystem) |
 | SGLS | Space-ground Link System |
 | OESS | Orbiter/ET Separation Subsystem |
 | FP | Freezing Point |