flus - frei
- flush light
- flush-mounted antenna
- flushed intake
- flutter
- flutter failure
- flutter-preventive weight
- flux distribution
- flux gate
- flux gate detector
- fluxgate compass
- fly
- fly boy
- fly-around
- fly-by portion of the spacecraft
- fly-by-light
- fly-by-wire
- fly-by-wire aircraft
- fly-by-wire guidance
- fly-by-wire system
- fly-down indication
