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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 72
Engine
CH-SC-SU Subject Page Effectivity
72-00-00 ENGINE - INTRODUCTION 2 GUN ALL
72-00-00 ENGINE - GENERAL DESCRIPTION 5 GUN ALL
72-00-00 ENGINE - MAIN ENGINE BEARINGS 8 GUN ALL
72-00-00 ENGINE - ENGINE FLANGE LOCATION 10 GUN ALL
72-00-00 ENGINE - ENGINE AERODYNAMIC STATIONS 12 GUN ALL
72-00-00 ENGINE - ACCESSORY DRIVE - COMPONENT LOCATIONS 14 GUN ALL
72-00-00 ENGINE - FAN BLADES AND SPINNERS 16 GUN ALL
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CHAPTER 72
Engine
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engines supply thrust to the airplane. The engines also
supply power to these airplane systems:
* Electrical
* Hydraulic
* Pneumatic.
Abbreviations and Acronyms
* AGB - accessory gearbox
* HDS - horizontal drive shaft
* HPC - high pressure compressor
* HPT - high pressure turbine
* IDG - integrated drive generator
* IGB - inlet gear box
* LPC - low pressure compressor
* LPT - low pressure turbine
* RDS - radial drive shaft
* TGB - transfer gear box
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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.
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