| Acronym | Meaning |
 | IGM | Interactive Guidance Mode |
| PMU | PCM Master Unit |
| VERLORT | Very Long Range Tracking Radar |
| PAC | Probe Aerodynamic Center |
| TD&SA | Telephone |
| SRF | Shuttle Refurbishment Facility |
| MDA | Maintainability Design Approach |
| ACRC | Assured Crew Return Capability - Now ACRV |
| OAS | Orbiter Aeroflight Simulator |
| CICU | Computer Interface Control Unit |
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