| Abbreviation | Definition |
|---|---|
| FCTB | Flight Crew Training Building |
| FCTF | Fuel Cell Test Facility |
| FCTS | Flight Crew Trainer Simulator |
| FCU | Fluid Checkout Unit |
| FCV | Flow Control Valve |
| FCW | Format Control Word |
| FD | Fault Detection |
| FD | Feed |
| FD | Flight Day |
| FD | Flight Deck |
| FD | Flight Director |
| FD | Freeze Dried |
| FD | Function Designator |
| FDA | Fault Detection and Annunciation |
| FDA | Flight Deck Assembly |
| FDAI | Flight Director Attitude Indicator |
| FDB | Fahrenheit Dry Bulb |
| FDB | Fluid Dynamic Bearing |
| FDD | Flight Definition Document |
| FDD | Flight Dynamics Division |