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Flaking
Example: Paint flaking (paint lifting off the surface). Describe if paint is
coming off down to primer or coming off to original surface of the part.
Flame Out
Gas – Turbine engine stop due to lack of fuel.
Fluctuation
Moving or swinging back and forth; often seen as an unstable instrument
indication.
FOD
Foreign object damage
Foreign Particle
or Object
A piece of material not normally found in or around a part or location.
Fouling
Clogging or choking usually caused by a foreign substance
Frayed
Worn into shreds by rubbing action.
Freedom of Motion Operating as intended without binding or excessive friction.
Friction
Rubbing together of two parts, resisting motion, usually causes excessive
wear.
Fused
Joining together of two materials, usually caused by heat, friction or
current flow.
G
Galled
A transfer of metal from one surface to another in an advanced case of
fretting corrosion or pitting.
Gap
An opening, break, space or separation.
Gouged
Scooping out of material, usually caused by a foreign object.
Grooved
Smooth, rounded furrow or furrows of wear, usually wider than scoring,
with rounded corners and smooth on the groove bottom.
Grounded
Undesired current path to ground (common)
(elec. circuit)
H
Hot-Spot
Subjected to excessive temperature, usually evidenced by change in color
and appearance of part. Also called local hot spot.