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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
72-00-00-000
ENGINE - INTRODUCTION
ENGINE - INTRODUCTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
72-00-00-000
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ENGINE - INTRODUCTION
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The CFM56-7 is a high bypass, dual rotor, axial flow turbofan
engine. The engine fan diameter is 61 inches (1.55 meters). The
bare engine weight is 5257 pounds (2385 kilograms).
The engine has these sections:
* Fan and booster
* High pressure compressor (HPC)
* Combustor
* High pressure turbine (HPT)
* Low pressure turbine (LPT)
* Accessory drive.
The fan and booster rotor and the LPT rotor are on the same
low pressure shaft (N1).
The HPC rotor and the HPT rotor are on the same high pressure
shaft (N2).
Fan and Booster
The fan and booster is a four-stage compressor.
The fan increases the speed of the air. A splitter fairing divides
the air into these two air flows:
* Primary
* Secondary.
The primary air flow goes into the core of the engine. The
booster increases the pressure of this air and sends it to the
HPC.
The secondary air flow goes in the fan duct. It supplies
approximately 80 percent of the thrust during take-off.
High Pressure Compressor (HPC)
The HPC is a nine-stage compressor. It increases the pressure
of the air from the LPC and sends it to the combustor. The HPC
also supplies bleed air for the aircraft pneumatic system and
the engine air system.
Combustor
The combustor mixes air from the compressors and fuel from
the fuel nozzles. This mixture of air and fuel burns in the
combustion chamber to make hot gases. The hot gases go to
the HPT.
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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EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
72-00-00-010
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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D633A101-GUN Oct 10/2002
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
72-00-00-010
ENGINE - GENERAL DESCRIPTION
ENGINE - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
72-00-00-010
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
　
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