| Acronym | Meaning |
 | LC | Intercom (Orbiter To Ground Via Hardline) |
| SRS | Specification Revision Sheet |
| DFS | Directional Finding System |
| IPS | Inches Per Second |
| GCA | Ground Controlled Approach |
| ECB | Engineering Change Board |
| CAS | Command Augmentation System |
| CRC | Cost Reduction Curve |
| CRS | Course |
| PEM | Plant Engineering And Maintenance |
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