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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
THIS PAGE IS INTENTIONALLY LEFT BLANK
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 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機維護手冊 發動機點火 ENGINE IGNITION PW 777 AIRCRAFT MAINTENANCE MANUAL
