CFM56-5B TRAINING MANUAL BASIC ENGINE

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FAN SECTION
The fan section is at the front of the engine and,
downstream from the air inlet cowl, the section includes
the fan and booster module and fan frame module.
The purposes of the fan and booster are :
- to accelerate air overboard to generate thrust.
- to increase the pressure of the air directed to the
High Pressure Compressor (HPC).
After entering the air inlet cowl, the total engine airflow
passes through the fan rotor, which increases the air’s
kinetic energy.
Most of the airflow is ducted overboard producing
approximately 80 % of the total thrust. The remainder is
directed through the booster, where it is pressurized
before entering the HPC.

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kinetic energy 
动能

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fan section

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FAN AND BOOSTER MODULE
The Fan and Booster module consists of :
- a spinner front cone
- a spinner rear cone
- a single stage fan rotor
- a four stage axial booster
The spinner front cone is designed to minimize ice buildup
and is attached to the spinner rear cone.
The spinner rear cone holds the blades axially in position
of the fan disk.
The fan disk supports the mid-span shrouded fan blades
and a booster spool.
The booster spool accommodates booster blade stages,
numbers 2 thru 5.
The booster vane assembly stages, numbers 1 thru 5,
are stacked and mounted on the fan frame.

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fan and booster design

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FAN AND BOOSTER MODULE (CONTINUED)
Spinner front cone
Interference fit and single angular mounting positions are
characteristics of the installation of the front and rear
cone onto the fan disk.
The spinner front cone has an offset hole on its rear
flange, identified by an indent mark, to ensure correct
alignment for installation onto the rear cone front flange.
The rear flange has 6 mounting screw locations and 3
threaded inserts, located every 120°, for installation of
jackscrews used in removal procedures.

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interference fit

过盈

mounting screw 
安装螺钉

jackscrew

起重螺丝

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spinner front 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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rear cone