fading out ?

failure (break down)

fall (to)

far

fast

feathered

fill (to)

fill (to) a flight plan

final

final approach

fine pitch

fire

five

flag

flag alarm

flap angle

flap angle

flapless landing

flaps

flashing light

flat (tyre)

flat tyre

flight

flight level

flight plan

float chamber

flow meter

fly (to)

fog

fog patches

forecast

forget (to)

forwards

four

freezing level

freight

freight

frequency

from (departure airfield)

fuel

fuel

fuel pressure lights

fullstop landing