| Acronym | Meaning |
| FDS | Flight Dynamics Simulator |
| HF | Hot Firing |
| OPI | Orbiter Payload Interrogator |
| HMC | Hybrid Microcircuit |
| N02 | Nitrogen Dioxide |
| RYD | Real Year Dollars |
| RVDT | Rotary Variable Differential Transformer |
| PTIS | Program Test Input System |
| GACU | Ground Avionics Cooling Unit |
| ISC | Johnson Space Center (formerly MSC) |