CFM56-5B TRAINING MANUAL BASIC ENGINE

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fan blades

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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 disk front flange

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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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rear cone

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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)
Spinner rear cone
The front flange of the spinner rear cone has 6 line
replaceable, crimped, self-locking nuts.
The inner rear flange has 12 mounting screw holes, for
installation onto the fan disk, and there are a further 6
threaded holes for the installation of jackscrews used in
rear cone removal procedures.
Both front and rear flanges have an offset hole to ensure
correct installation and they are identified by indent
marks.
The rear cone also has an integrated air seal that is
glued to its inner rear flange.

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spinner front cone

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interference fit

过盈

mounting screw 
安装螺钉

jackscrew

起重螺丝