| Acronym | Meaning |
 | IDO | InterdivisionalOperations |
| SE&I | System Element |
| PFCS | Primary Flight Control System |
| GPI | Ground Position Indicator |
| DRG | Digital Ranging Generator |
| REO | Require |
| CFI | Card Format Identifier |
| PDS | Power Distribution System (Subsystem) |
| EAC | Energy Absorbing Capacity |
| UPLK | Uplink |
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