CFM56-5B TRAINING MANUAL BASIC ENGINE

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FAN AND BOOSTER MODULE (CONTINUED)
Spinner rear cone (continued)
The rear cone prevents axial disengagement of spacers
used in the fan blade retention system.
It also supports a series of balancing screws that are
installed on its outer diameter. There are two sets of
balancing screws available and the screws in each set
are identified as either P01 to P07 or, P08 to P14. The
numbers, which are engraved on the screw heads, are
equivalent to various weights.
An indent mark is located in between two balancing
screws for correct installation of the rear cone onto the
fan disk and for identification of fan blade No.1.

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rear cone

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FAN AND BOOSTER MODULE (CONTINUED)
Fan disk
The fan disk outer rim has 36 dovetail recesses for the
installation of the fan blades.
The inner front flange has an imprint to identify an offset
hole for rear cone installation.
There are also two identification marks engraved on
either side of blade recesses No.1 and 5.

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fan disk front flange

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FAN AND BOOSTER MODULE (CONTINUED)
Fan blades
There are 36 titanium alloy, mid-span shrouded fan
blades.
Each blade has a dovetail base that slides into a recess
on the fan disk outer rim.
A retainer lug, machined at the rear end of the blade
root, engages the forward flange of the booster spool
and limits axial movements.
A spacer, installed underneath each blade, limits the
radial movement.

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fan blades

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FAN AND BOOSTER MODULE (CONTINUED)
Fan blades (continued)
Each blade has specific indications engraved on the
bottom of the root :
- Part number
- Serial number
- Momentum weight
- Manufacturer code
The fan blade root faces have an anti-friction plasma
coating (Cu-Ni-In) and a top coat of cured molybdenumbase
film varnsh, which acts as a lubricant.
Lubrication of blade roots is further improved by the
application of solid molybdenum-base lubricant before
installation on the fan disk.
The mid-span shroud contact surfaces have a tungstencarbide
coating. They are also lubricated with solid
molybdenum-base lubricant at blade installation.

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molybdenum
D.J.[məˈlibdinəm]
K.K.[məˈlɪbdənəm]
n.
钼

 

tungsten carbide 
碳化钨,硬质合金

 

sub-contractor 
分承包人;副承包商

 

hard coat 
硬膜

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fan blade root

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mounting flange 
安装用法兰