Visible effects (burn spots, fused metal) of an undesired electrical discharge between two electrical connections.
Restricted movement such as tightened or sticking condition resulting from high or low temperature, foreign object jammed in mechanism, etc.
A rough edge or a sharp projection on the edge or surface of the parent material.
Frictional wear damage usually caused by two parts rubbing together with limited motion.
Surface cracks usually caused by heat.
A breaking away of the edge corner or surface of the parent material usually caused by heavy impact (not flaking).
Circuit – Grounded:
Undesired current path to ground (common).
Circuit – Open:
Incomplete electrical circuit due to separation at or between electrical connection points.
Circuit – Shorted:
Undesired current path between leads or circuits that normally are at a different potential.
Gradual destruction of the parent material by chemical action. Often evidenced by oxide build-up on the surface of the parent material.
Material damage to parts (as in the case of crossed threads) or part rendered inoperative (as in the case of crossed wires) as a result of improper assembly.
Part(s) wherein the intended common center is displaced significantly.
Carry away of material by flow of fluids or gases, accelerated by heat or grit.
Permanent deformation beyond tolerance limits usually caused by compression.
Worn into shreds by rubbing action.
Joining together of two materials usually caused by heat, friction, or current flow.
Undesirable development of a hard, glossy surface due to rubbing action, heat or varnish.
Cracks, inclusions, fractures etc. not visible without fluorescent or magnetic penetrants.
Deformation from the o-riginal configuration due to heat, friction or pres-sure as with melted bear-ings or insulation.
Improper association of two or more parts.
Improper installation of a part resulting in damage to the installed part or to associated parts.
Pipe, hoses, tubing, channeling, internal passage etc. which are totally or partially blocked.
Usually applies to operation as opposed to surface finish; i.e. a condition of bearings (which cannot be disassembled further) where during the spin test the rotation is rough.
To move with pressure or friction against another part such as compressor rub.
Sometimes written down when corrosion is found. Applies only to some specific persons. If “rust” is found, no aircraft will ever leave the hangar.
Parts bound together because of expansion or contraction due to high or low temperature, foreign object jammed in mechanism, etc.
Enlargement of a part as a result of exposure to operating conditions.+
A condition usually associated with threads or insulation. Involves removal of material (threads) by force.
Material of part consumed as a result of exposure to operation or usage, beyond the limits given by the manufacturer.
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