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See the engine fuel and control chapter for more information on
the fuel nozzles. (CHAPTER 73)
High Pressure Turbine (HPT)
The HPT is a single-stage turbine. It changes the energy of the
hot gases into a mechanical energy. The HPT uses this
mechanical energy to turn the HPC rotor and the accessory
drive.
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Low Pressure Turbine (LPT)
The LPT is a four-stage turbine. It changes the energy of the hot
gases into a mechanical energy. The LPT uses this mechanical
energy to turn the fan and booster rotor.
Accessory Drive
The accessory drive has these components:
* Inlet gear box (IGB)
* Radial drive shaft (RDS)
* Transfer gear box (TGB)
* Horizontal drive shaft (HDS)
* Accessory gear box (AGB).
The N2 shaft turns the AGB through these shafts and
gearboxes:
* IGB
* RDS
* TGB
* HDS.
The AGB holds and operates the airplane accessories and the
engine accessories. They are described later in this section.
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General
Five main engine bearings hold the N1 shaft and the N2 shaft.
Numbers from 1 to 5 identify the engine bearings. Ball bearings
absorb the axial and the radial loads from the shafts. Roller
bearings absorb only radial loads.
The main engine bearings are in two sump cavities. The sump
cavities are the forward sump and the rear sump.
Main Engine Bearings
The number 1 and the number 2 bearings hold the front of the
N1 shaft.
One ball bearing and one roller bearing are the number 3
bearing assembly. Both number 3 bearings hold the front of the
N2 shaft.
The number 4 bearing holds the rear of the N2 shaft.
The number 5 bearing holds the rear of the N1 shaft.
The number 1, 2, and 3 bearings are in the forward sump. The
number 4 and 5 bearings are in the rear sump.
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General
The engine has 16 flanges. The flanges are identified with an
alphanumeric designation. The flanges hold various
accessories and components. You use the alphanumeric
designations to find the position of components on the engine.
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General
There are probes or sensors at these 5 aerodynamic stations
on the CFM56-7.
* Station 0 (ambient air)
* Station 12 (fan inlet)
* Station 25 (high pressure compressor inlet)
* Station 30 (high pressure compressor discharge)
* Station 49.5 (stage 2 low pressure turbine stator).
See the engine fuel and control chapter for more information on
engine fuel and control. (SECTION 73-00)
See the engine indicating chapter for more information on the
probes and sensors. (SECTION 73-21)
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