flicker effect nausea, dizziness or vertigo which can be brought on by flickering at certain frequencies of a bright light source such as sunlight or strobe when viewed through a rotating propeller or rotor blades.
FLIR forward-looking infra-red.
FLM foot-launched microlight.
FLPA foot-launched powered aircraft, e.g. powered parachutes.
FM frequency modulation
FMC/S flight management computer/system
FMGC flight management guidance computer
FMS flight management system
FMU flight management unit
FOD foreign object damage, usually to turbine engines through ingestion of runway debris etc.
FPL filed flight plan
fpm feet per minute, a measure of an aircraft's rate of climb or descent. Similarly m/s or mps, metres per second.
FSS Flight Service Station (USA).
FTO flying training organisation
FTS Flying Training School (RAF)
ft/min feet per minute
g the acceleration force of gravity, normally 1g on earth. Zero g (0g) is weightlessness, as experienced by orbiting astronauts. g is expressed as positive (+) and negative (-) values. During a normal loop a pilot experiences positive g, tending to force him down in his seat. In an outside loop, with the pilot's head on the outside of the vertical circle, negative g forces him up against his straps. Aircraft structural load limits are expressed in positive and negative values, the positive limit usually greater than negative, except in specialist aerobatic types.
g-loc g-induced loss of consciousness. Pilot blackouts caused by excessive g or by too-rapid onset of g-forces. Experienced mostly by pilots of high-performance military jets and competition aerobatic aircraft, has led to fatal crashes.
GA general aviation, all flying other than airlines and the military.
GAAC General Aviation Awareness Campaign
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