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
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IGNITION - DESCRIPTION AND OPERATION
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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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74-00-00
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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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74-00-00
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE IGNITION - TROUBLE SHOOTING
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1. Trouble Shoot the Engine Ignition System
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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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74-00-00
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