| Acronym | Meaning |
 | M/F | Maintenance Factor |
| GSI | Glide Slope Indicator |
| VGOR | Vehicle Ground Operation Requirements |
| ICDU | Inertial CouPling Data Unit |
| OMR | Orbiter Management Review |
| ICAO | International Civil Aviation Organization |
| MTO | Maximum Time Out |
| IPS | IPTCSInternational Pipe Thread |
| HMF | Horizontal Mating Facility |
| OMC | Orbiter Maintenance And Checkout |
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