CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CHAPTER 74 - IGNITION
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 IGNITION 74-00-00
________ Description and Operation 1 ALL Trouble Shooting 101 ALL Adjustment/Test 501 ALL
 ELECTRICAL POWER SUPPLY 74-10-00
_______________________
 IGNITION POWER SUPPLY 74-11-00
 Description and Operation 1 ALL
 EXCITER - IGNITION 74-11-01

 Removal/Installation 401 ALL
 Inspection/Check 601 ALL

 DISTRIBUTION 74-20-00
____________ HIGH TENSION DISTRIBUTION 74-21-00 Description and Operation 1 ALL General 1
 IGNITER - SPARK 74-21-02 Removal/Installation 401 ALL Inspection/Check 601 ALL
 LEAD - IGNITION 74-21-01 Removal/Installation 401 ALL Inspection/Check 601 ALL Approved Repairs 801 [*]
 [*] TYPE 3 AND TYPE 4 IGNITION LEAD
 SWITCHING 74-30-00
_________ ENGINE IGNITION CONTROL 74-31-00
 Description and Operation 1 ALL General 1 Start Lever Actuated Switches 1 Operation 1
 SWITCHES - ENGINE START AND 74-31-12 IGNITER SELECT Adjustment/Test 501 ALL
 74-CONTENTS

 CBEJ Page 1 Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IGNITION - DESCRIPTION AND OPERATION
____________________________________
 1.  General
_______
 A.  The ignition system (Fig. 1) consists of an engine start switch, engine igniter selector switch, 2 high energy ignition exciters or 2 low energy ignition exciters, 2 spark igniters and 2 coaxial shielded ignition leads.
 B.  The purpose of the system is to produce an electrical spark to ignite the fuel and air mixture in the engine combustion chamber during the start cycle and to provide continuous ignition during takeoff, landing and operation in adverse weather conditions.
 C.  The left, right or the two spark igniters can be selected during the start cycle or for continuous ignition operation.
 D.  The ignition system consists of the Ignition Power Supply, 74-11-00; High Tension Distribution, 74-21-00; and Engine Ignition Control, 74-31-00.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IGNITION
EXCITERS

UPPER AND LOWER IGNITION EXCITERS
SPARK IGNITER
LEFT IGNITION LEAD
(TO UPPER IGNITION

 EXCITER) 3 O'CLOCK STRUT
SEE A RIGHT IGNITION LEAD (TO LOWER IGNITION
 EXCITER) IGNITION LEAD CONNECTORS G-M56-MM-0173(1)-00B
VIEW IN THE FORWARD DIRECTION
ENGINE START
OFF BOTH OFF
GRD
CONT  GRD CONT
FLT FLT
IGNIGN L
R
1 2
FLIGHT COMPARTMENT
A

Ignition System Component Location
Figure 1

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE IGNITION - TROUBLE SHOOTING
__________________________________
 1. Trouble Shoot the Engine Ignition System
________________________________________
 A. Procedure
 (1)  To trouble-shoot the Engine Ignition system, refer to the trouble-shooting diagrams in Chapter 71 (AMM 71-00-40/101).
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