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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NOTE: RIGHT SIDE OF BLADE DOVETAIL SHOWN. LEFT SIDE IS EQUIVALENT (SIDE VIEW) A-A
MISSING COATING IS PERMITTED IN THIS AREA
MISSING COATING IS NOT PERMITTED IN THIS AREA S-M56-MM-03254-00-B
Fan Blade Dovetail Inspection
Figure 603
F10111
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CFM56 ENGINES
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a) Up to a maximum of 10% of missing coating is permitted in the contact area if there is no wear of the base
metal.
NOTE: A 1200 cycle maximum service extension is
____ permitted. The blade must be cleaned before the inspection and then relubricated with CFMI recommended product before the installation for extension.
NOTE: Repeated extensions are permitted if dovetail
____ is cleaned, examined and then lubricated before the blade installation.
NOTE: To use this service extension, you must clean
____ the blades before the inspection and the apply lubricant on the blades.
NOTE: You can usually see a step or a line at the
____ top and/or at the end of the pressure faces.
NOTE: The area of the most important wear is usually
____ at the leading edge of the concave side and at the trailing edge of the convex side.
NOTE: Typical appearance of unaffected Cu Ni Indium
____ coating (no wear) associated with molydag coating missing is light grey coloured.
NOTE: Typical appearance Cu Ni Indium coating
____ exhibiting wear is golden coloured.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
b) Over 10% and less than 50% of Cu Ni Indium coating missing in the contact area, a 400 cycle maximum extension is permitted if there is no wear of the base metal.
NOTE: To use this service extension, you must clean
____ the blades before the inspection and the apply lubricant on the blades.
NOTE: No repeated extension is permitted.
____
NOTE: You can usually see a step or a line at the
____ top and /or at the end of the pressure faces.
NOTE: The area of the most important wear is usually
____ at the leading edge of the concave side and at the trailing edge of the convex side.
NOTE: Typical appearance of unaffected Cu Ni Indium
____ coating (no wear) associated with molydag coating missing is light grey coloured.
NOTE: Typical appearance Cu Ni Indium coating
____
exhibiting wear is golden coloured.
c) Missing coating in the non contact areas only are permitted if you obey these limits:
1.
Chipping and flaking on the leading edge is
_ permitted if it is less than 0.08 inch (2.0mm) from the forward edge.
2.
Chipping and flaking on the trailing edge is
_ permitted if it is less than 0.280 inch (7.0 mm) from the aft edge.
3.
Chipping and flaking on the top edge is permitted
_ if it is less than 0.020 inch (0.5 mm) from the top edge.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
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