| Acronym | Meaning |
 | IFTM | In-Flight Test Maintenance |
| E&D | Engineering And Development |
| OM | RS Operations And Maintenance Requirements Specification |
| E-MUX | Electrical Multiplex |
| STD | Shuttle Test Director |
| B/A | Barometric Altimeter |
| HCSL | Hybrid Computation And Simulation Laboratory |
| MWG | MMWG Maintenance Analyzer Working Group |
| SSE | Subsystem Element |
| BTC | Bus Tie Contractor |
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