99 fog
flowmeter /fl.υmit./ noun a device for measuring the flow of a liquid or gas
. The oxygen flowmeter should blink once for each breath.
fluctuate /flkt.ue.t/ verb to vary or change irregularly . The magnetic field will fluctuate at the supply frequency.
fluid /flu.d/ noun a substance which is not solid, whose molecules move freely past one another and that takes the shape of its container . de-icing fluid a liquid for removing ice
fluorescent /flυ.res(.)nt/ adjective
referring to the emission of electromag-netic radiation of visible light . The flu-orescent penetrant process of flaw detection uses a penetrant containing a fluorescent dye which fluoresces in ultra-violet light.
fly /fla./ verb to move through the air or to cause an aircraft to move through the air in a controlled manner . An aero-plane may not fly over a city below such a height as would allow it to alight in the event of an engine failure. . He’s learning to fly. (NOTE: flying – flew – flown) . to fly in formation to fly as a group which maintains a particular pat-tern or arrangement in the air
fly-by-wire /fla. ba. wa../ noun
technology which interprets move-ments of the pilot’s controls and, with the aid of computerised electronics, moves the control surfaces accordingly
. Using fly-by-wire technology, the stalling angle cannot be exceeded regardless of stick input. . The more reliable and quick fly-by-wire system allows a much greater degree of flexi-bility with aircraft stability.
COMMENT: Fighters like the General Dynamics F16 and large transport aircraft such as the Boeing 777 and Airbus A320 have fly-by-wire systems.
flying /fla.../ noun the act of making an aircraft move through the air in a controlled manner
flying boat /fla... b.υt/ noun a sea-plane with a body that acts like a boat’s hull and allows the plane to float on water. Compare floatplane

flying conditions /fla... k.n
d..(.)nz/ plural noun the weather and its suitability for flying
flying controls /fla... k.ntr.υlz/
plural noun the yoke or control column, rudder pedals and other devices used by the pilot in order to manoeuvre the air-craft
flying field /fla... fild/ noun a
small airfield from which light aircraft can operate
flying instructor /fla... .n strkt./ noun a trained person, a pilot, who teaches people how to fly an air-craft