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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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________________
Scale A layer of metallic oxides that forms by a chemical action of oxygen on the outside surface of the metal, usually while hot. Burn
Scratch A long, thin, sharp-cornered impression caused by a sharp object that moves across the surface of the parent material. AbrasionChafeFurrowGroove Score
Seizure A welding or binding of faces prevents more movement. Bound upFrozen Tight Wedged Welded (without external heating)
Shingling A condition when one fan blade mid-span shroud moves on 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 pre-twist that is not there, too much radial movement, etc. Bound upShingledWedged
Spalling Small particles of metal that crack or flake off of the surface, usually in thin layers or specific spots. FlakingFrettingGalling
Unbalance When you put a balanced component out of balance. Usually "imbalance".
Varnish film A hard surface-film of not fully carbonized hydrocarbon, such as oil, which is built up when the part is heated to or above the breakdown-point of the fluid. BandedDiscoloredOxidizedStained
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-00-01
ALL ú ú C01 Page 209 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Terms_____ Definition__________ Associated Terms________________
Wear Related to the slow removal of Abrasion
the parent material in the Attrition
process of operation (not always Brinnelled
visible to the naked eye). Chafed
Chattering
Erosion
Fraying
Fretting
Friction
Galling
Glazing
Groove
Interference
Oxidation
Roughness
Rubbed
Scarfed
Scuffed
Uneven
Weak
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-00-01
ALL ú
ú C01 Page 210
ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
C. Abbreviations
S 912-010-C00
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