Burr
Backed outExcessive play Excessive back-lash Insufficient torque Shaky Sloppy Unbottomed Unpinned Unwired
EccentricOut-of-roundOut-of-squareMismatchedUnmatched
ChipDentNotch
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No apparent Term used to describe surface
Depth defects that can be seen but not felt with fingernail or scriberpoint.
Noise An abnormal sound involving moving parts, usually an increase in volume or a change of pitch.
Obstruction Prevention of free flow of a fluid (air, oil, fuel, water) because of foreign material in the flowpath or malformation of the part.
Oil-canning Snapping or popping displacement
(Snapping of sheet metal when restrained at
action) its edges like a diaphragm, wall, or bottom of an oil can.
Parent Metal All material in a single part except the weld, braze filler, or heat-affected zone (within 1/8 inch (3.175 mm) of the fusion line).
Pickup Transfer of one material into or onto the surface of another in contact with it, usually as a result of friction-heating.
Bumps (sound)ChattersClicks Grates (usually gears) Grinds Hums Rattles Rubs Scrapes (sound) Screeches Thumps Whistles
CloggedContaminatedPluggedRestricted
Buckling
BurrGallImbedmentInclusion Pile-up Protrusion Metallization
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of the parent material, caused by pressure. CompressedFlattened Seized
Smashed (without separation into pieces) Squashed Squeezed
Pit A minute depression or cavity having no sharp, high-stress corners in the surface of the material. Pits are usually caused by chemical reaction (rusting, chemical corrosion). CorrosionCraterElectrolytic cavityInclusionPerforationPinholes Pock-marked
Porosity Areas containing numerous pits or pinholes. PitPinholes
Rub A surface depression or displacement caused by two surfaces moving while in contact with each other. If impression is shallowand smooth, see "Wear".If impression is sharp,see "Scratch".
Scale A layer of metallic oxides formed by chemical action of oxygen on the exposed surface of the metal, usually while hot. Burn
Scratch A long, narrow, sharp-cornered impression caused by the movement of a sharp object across the surface of the parent material. AbrasionChafeFurrowGroove Score
Seizure A welding or binding of faces which prevent further movement. Bound upFrozen Tight Wedged Welded (without external heating).
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Shingling A condition when one fan blade mid-span shroud moves over the other (usually when something hits the fan). The condition can also occur to the blade tip shrouds on the LPT rotor (Stg. 3 and 4). The condition on the LPT is usually caused by a loss of pre-twist, too much radial movement, etc.
Spalling Cracking off or flaking off of small particles of metal from the surface, usually in thin layers or localized spots.
Tear A physical separation by tearing, pulpulling apart by force, or wrenching of metal.
Unbalance The act of putting a balanced component out of balance. Usually "imbalance" is meant.
Varnish film A hard surface-film of partially carbonized hydrocarbon, such as oil, which is built up when the part is heated to or above the breakdown-point of the fluid.
Wear Relatively slow removal of parent material in the process of operation (not always visible to the naked eye).
Wedged Bound up Shingled
FlakingFrettingGalling
BandedDiscoloredOxidizedStained
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