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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
EFG
ENGINE FUEL AND CONTROL
Fuel control
The fuel control function computes the Fuel Metering Valve (FMV) demand signal, depending on the engine control laws and operating conditions.
Fuel flow is regulated to control N1 and N2 speed :
- During engine starting and idle power, N2 speed is controlled.
-During high power operations, requiring thrust, N1 speed is controlled and N2 is driven between minimum and maximum limits.
The limits depend on :
-Core speed.
-Compressor discharge pressure (PS3).
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Fuel / air ratio (WF/PS3).
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Fan & core speed rates (accel and decel).
CFM56-5B TRAINING MANUAL
Idle control.
The FADEC system controls the idle speed:
-Minimum Idle will set the minimum fuel flow requested to ensure the correct aircraft ECS pressurization.
-Approach Idle is set at an engine power which will allow the engine to achieve the specified Go-Around acceleration time.
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PWR MAN Page 13
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
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EFG
FUEL DISTRIBUTION
EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL DISTRIBUTION
The purpose of the fuel distribution system is :
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To deliver fuel to the engine combustion chamber.
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To supply clean and ice-free fuel to various servo-mechanisms of the fuel system.
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To cool down engine oil and Integrated Drive
Generator (IDG) oil.
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CTC-201-069-02
EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：TRAINING MANUAL CFM56-5B ENGINE SYSTEMS 培训手册 CFM56-5B 发动机系统(34)
