CHAPTER
74
ENGINE IGNITION PW
777 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 74 ENGINE IGNITION PW
CHAPTER 74
ENGINE IGNITION PW
CH-SC-SU Subject Page Effectivity
74-00-00 IGNITION -INTRODUCTION 2 BEJ ALL
74-00-00 IGNITION -GENERAL DESCRIPTION 4 BEJ ALL
74-00-00 IGNITION -ENGINE COMPONENT LOCATIONS 6 BEJ ALL
74-00-00 IGNITION -IGNITION EXCITER 8 BEJ ALL
74-00-00 IGNITION -IGNITERS 10 BEJ ALL
74-00-00 IGNITION -FUNCTIONAL DESCRIPTION 12 BEJ ALL
74-00-00 IGNITION -OPERATION 15 BEJ ALL
74-CONTENTS
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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IGNITION -INTRODUCTION
Each engine has two ignition systems that operate independently. They supply electrical sparks in the combustion chamber to start combustion or make sure combustion continues.
The ignition system has automatic and manual operation modes on the ground and in flight.
Abbreviations and Acronyms
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AIMS -airplane information management system
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ACIPS -airfoil and cowl ice protection system
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EDIU -engine data interface unit
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EEC -electronic engine control
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ELMS -electrical load management system
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ERU -engine relay unit
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FSEU -flap slat electronics unit
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OPAS -overhead panel ARINC 629 system
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PW4000 SERIES ENGINES
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IGNITION -INTRODUCTION
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IGNITION -GENERAL DESCRIPTION
The ignition system for each engine contains these components:
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Ignition exciter (2)
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Exciter-to-igniter plug cable (2)
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Igniter plug (2).
These components control the operation of the ignition system:
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Start/ignition selector
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Fuel control switch
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EEC
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Airfoil and cowl ice protection system (ACIPS)
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Flap slat electronics unit (FSEU).
Power
The ignition system gets 115v ac power from the electrical load management system (ELMS). The fuel control switch must be in the RUN position to let ELMS supply ignition power to the engine relay unit (ERU). The EEC controls the ERU. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 发动机点火 ENGINE IGNITION PW 777 AIRCRAFT MAINTENANCE MANUAL
