| Acronym | Meaning |
 | PHA | Preliminary Hazard Analyses |
| NOM | Network OutPut Multiplexer |
| CLC | Change Letter Control |
| MS | Master Switch |
| SIS | Serial Input Special |
| DBCI | DB With Respect To A Circular Polarized Antenna |
| FCH | L Flight Control Hydraulics Laboratory |
| OFS | Orbital (Orbiter) Flight System |
| MAEP | Minimum Autoland Entry Point |
| FA/COSI | Final Assembly And Closeout System Installation |
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