| Acronym | Meaning |
| TFCS | Triplex Flight Control System (Subsystem) |
| INTF | Interface |
| ELV | Electrically Operated Valve |
| CRC | Cost Reduction Curve |
| MMES | MSFC Mated Element Systems |
| RF | Communications Support |
| SP-FGS | Flight And Ground Systems Office (KSC Shuttle) |
| MMC | Mission Management Center |
| PPCO2 | Partial Pressure CO2 |
| LIMRC | LRU Identification And Maintenance Requirements Catal |