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74-EFFECTIVE PAGES
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 74
Ignition
CH-SC-SU Subject Page Effectivity
74-00-00 IGNITION - INTRODUCTION 2 GUN ALL
74-00-00 IGNITION - GENERAL DESCRIPTION 6 GUN ALL
74-00-00 IGNITION - ENGINE COMPONENT LOCATION 10 GUN ALL
74-00-00 IGNITION - FLIGHT COMPARTMENT COMPONENT LOCATIONS 14 GUN ALL
74-00-00 IGNITION - IGNITION EXCITER 18 GUN ALL
74-00-00 IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS 20 GUN ALL
74-00-00 IGNITION - FUNCTIONAL DESCRIPTION 23 GUN ALL
74-00-00 IGNITION - OPERATION 27 GUN ALL
74-00-00 IGNITION - TRAINING INFORMATION POINT 32 GUN ALL
74-CONTENTS
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CHAPTER 74
Ignition
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74-00-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The ignition systems supply electrical sparks in the combustion
chamber for combustion. Each engine has two ignition systems
that operate independently. The ignition system usually
operates manually. However, the ignition systems operate
automatically when the electronic engine control (EEC) sees a
possible engine flameout condition.
You use ignition during these times:
* Ground start
* Takeoff and landings
* In-flight (during heavy turbulence or bad weather)
* In-flight start.
Abbreviations and Acronyms
* CDS - common display system
* CDU - control display unit
* CONT - continuous
* DEU - display electronics unit
* EEC - electronic engine control
* FLT - flight
* FMC - flight management computer
* GRD - ground
* IGN - ignition
* L - left
* R - right
IGNITION - INTRODUCTION
EFFECTIVITY
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74-00-00-001
IGNITION - INTRODUCTION
IGNITION - INTRODUCTION
EFFECTIVITY
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IGNITION - INTRODUCTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These components control ignition:
* Start levers
* Start switches
* Ignition selector switch
* Electronic engine control (EEC).
The start lever controls ignition system power to the EEC. The
start switch and the ignition selector switch supply inputs to the
EEC. The EEC uses these inputs to supply power to the ignition
exciters. The ignition exciters supply power to the spark
igniters.
The engine starting system also uses the switch positions for
control.
See the engine starting chapter for more information.
(CHAPTER 80)
Electrical Power
The engine 1 ignition systems receive 115v ac from ac transfer
bus 1 and the ac standby bus. The EEC has internal switches
that control the 115v ac to the ignition exciters. The ignition
exciters change the 115v ac input to a dc voltage of
approximately 15,000 to 20,000v for the spark igniters. The
spark igniters give a spark for combustion. The ignition systems
of engine 2 receive ac power from ac transfer bus 2 and the ac
　
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