| Acronym | Meaning |
 | N/C | Normally Closed |
| CIA | Controller Interface Assembly |
| RCR | Retrofit Configuration Record |
| FND | Facility Need Date |
| NORAD | North American Air Defense Command |
| POP | Preflight Operations Procedures |
| PCA | Pneumatic Control Assembly |
| ORI | Operational Readiness Inspection |
| SSSS | Space Shuttle System Specification |
| IMU | Internal Measurement Unit |
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