| Acronym | Meaning |
 | OCH | Orbiter Common Hardware |
| FNT | Failure Notification Telex |
| MED | Medium |
| FCP | Fuel Cell Power Plant |
| KDU | Keyboard And DisPlay Unit |
| SW | Switcher (Switch) |
| OSE | Orbiter Support Equipment |
| SCF | Standard Charge Factor |
| SYNCOM | Synchronous Communication Satellite (Hughes) |
| OMD | Operations And Maintenance Documentation |
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