| Acronym | Meaning |
 | SID | Shuttle Integration Device |
| OCC | Office Of Contract Compliance |
| SPCC | STS Processing Control Center |
| PSI | Pounds Per Square Inch (Static Pressure) |
| TCS | Technical Change Summary |
| MCA | Maximum Crossing Altitude |
| PDC | Predefined Command |
| CM | Configuration Management |
| HIU | Headset Interface Unit |
| LPS/CDS | LPS/Central Data Subsystem |
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