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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
D633W101-BEJ May 05/2003
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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Page 1 D633W101-BEJ Sep 05/2002
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 * AIMS -airplane information management system
* ACIPS -airfoil and cowl ice protection system
* EDIU -engine data interface unit
* EEC -electronic engine control
* ELMS -electrical load management system
* ERU -engine relay unit
* FSEU -flap slat electronics unit
* OPAS -overhead panel ARINC 629 system
EFFECTIVITY BEJ ALL 74-00-00 Page 2 D633W101-BEJ Sep 05/2002
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
IGNITION -INTRODUCTION
EFFECTIVITY BEJ ALL 74-00-00 Page 3 D633W101-BEJ Sep 05/2002
IGNITION -GENERAL DESCRIPTION
The ignition system for each engine contains these components: * Ignition exciter (2)
* Exciter-to-igniter plug cable (2)
These components control the operation of the ignition system: * Start/ignition selector
* Fuel control switch
* Airfoil and cowl ice protection system (ACIPS)
* Flap slat electronics unit (FSEU).
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. 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
