| Acronym | Meaning |
| DWV | Dielectric Withstanding Voltage |
| FCSS | Fuel Cell Servicing System |
| DI | Discrete Input |
| NO | Not For Off -KSC Distribution |
| FEP | Front End Processor |
| TCTI | Time Compliance Technical Instruction |
| POP | Preflight Operations Procedures |
| R/T | Real Time |
| MSE | Mechanical Support Equipment |
| IFU | InterfaceUnit |