BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Terms_____ Definition__________ Associated Terms________________
High metal Metal that moves and is adjacent to a defect such as a scratch, nick or gouge, which is lifted above the surrounding area. Burr
Imbalance The state of being out-of-balance. Apply a weight that is not equal about the axis it turns, which usually results in vibration.
Inclusion Unwanted material in the metal
when it becomes solid, or made by subsequent reaction of the solid metal.
Indication Defects in a material that you can see or the defects you can not see with the naked eye.
Looseness A part that moves unusually, or a part that is not attached correctly. Backed outExcessive playExcessive backlash Insufficient torque Shaky Sloppy Unbottomed
Unpinned Unwired
Misalignment A part that is not made right or is not aligned has one of the two: prevents the correct assembly or results in the faulty operation and ultimate failure. EccentricOut-of-roundOut-of-squareMismatchedUnmatched
Nick A surface that is pushed in with sharp corners or at the bottom, is usually caused by pressure or a hit from a sharp-edged object. The parent material is displaced, but usually none is separated. ChipDentNotch
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Terms_____ Definition__________ Associated Terms________________
No Apparent Depth Term used to describe surfacedefects that you can see but can not felt with your fingernail or a scriberpoint.
Noise An unusual sound that includes parts that move, usually an increase in volume or a change of pitch. Bumps (sound)ChattersClicksGrates (usually gears) Grinds
Hums
Rattles
Rubs
Scrapes (sound) Screeches
Thumps Whistles
Obstruction Prevents a free flow of fluid (air, oil, fuel, water) because of unwanted material in the flowpath or shape of the part. CloggedContaminatedPluggedRestricted
Oil-canning (Snapping action) A move or click displacement of sheet metal when held at itsedges like a diaphragm, wall or bottom of an oil can. Buckling
Parent Metal All material in a single part that does not include the weld, braze filler or heat damaged zone (within 1/8 inch (3.175 mm) of the fusion line).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-00-01
ALL ú
ú C01 Page 207
ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Terms_____ Definition__________ Associated Terms________________
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