74-21-00
 ALL  ú ú C01.1 Page 3 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CERAMIC
SHELL
INSULATION
PIN ELECTRODES
WASHER ELECTRODE

WASHER TYPE ELECTRODE

GMM-1077427-03-B
Ignition Lead and Spark Igniter Figure 1 (Sheet 3)
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 74-21-00
 ALL  ú ú C01 Page 4 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IGNITION LEAD - REMOVAL/INSTALLATION
____________________________________
 1.  General
_______
 A.  This procedure is for the removal and installation of Type 3 and Type 4 ignition leads.
 TASK 74-21-01-004-001-C00
 2.  Remove the Ignition Lead
________________________
 A.  Equipment
 (1)  Tool - Ignition Lead Nut Removal,
 No. 856A2007P01,
 (Required for Type 3 ignition lead only)
 CFM International,

 P.O. Box 15514
 Cincinnati, OH 45215

 B.  References
 (1)  
AMM 71-11-02/201, Fan Cowl Panels

 (2)  
AMM 74-21-02/401, Spark Igniter

 (3)  
AMM 78-31-00/201, Thrust Reverser Systems

 C.  Access
 (1)  Location Zones 503 Engine No. 1 - Forward Side of the Accessory Gearbox at the 9 o'clock position 504 Engine No. 1 - Forward Side of the Accessory Gearbox at the 9 o'clock position 505 Engine No. 1 - Forward Side of the Accessory Gearbox at the 9 o'clock position 502 Engine No. 1 - Forward Side of the Accessory Gearbox at the 9 o'clock position 603 Engine No. 2 - Forward Side of the Accessory Gearbox at the 9 o'clock position 604 Engine No. 2 - Forward Side of the Accessory Gearbox at the 9 o'clock position 605 Engine No. 2 - Forward Side of the Accessory Gearbox at the 9 o'clock position
 602  Engine No. 2 - Forward Side of the Accessory Gearbox at the 9 o'clock position
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 74-21-01
 ALL  ú ú C01 Page 401 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
UPPER AND LOWER 
IGNITION EXCITERS 
CLAMPS 
CLAMPS 
SEE  C 
LEFT IGNITION LEAD  SEE  D  CLAMPS 
(TO UPPER IGNITION 
EXCITER) 
SEE  B 
3 O'CLOCK STRUT 1 
RIGHT IGNITION LEAD 
(TO LOWER IGNITION 
EXCITER) 
O-RINGS 
VIEW IN THE FORWARD DIRECTION 
A
BOLT  CLAMPS 
O-RINGS 

STRUT 3 O'CLOCK  CLAMPS  C 
B 
1  SEALANT REQUIRED  G-M56-MM-0150(1)-01-B 
Ignition Lead Installation Figure 401 (Sheet 1) 

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 74-21-01
 ALL  ú ú C01 Page 402 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CLAMPS
CLAMP
CLAMP CLAMP  LEFT IGNITION LEAD 
LEAD CONNECTOR RIGHT IGNITION SEE E F  RIGHT SIDE D  CLAMP IGNITION LEAD RIGHT FWD 
CLAMPS 
LEFT IGNITION LEAD 
CLAMP 
CLAMP 
FWD LEFT SIDE Figure 401 (Sheet 2) Ignition Lead Installation D G-M56-MM-0172(1)-02-B LEAD CONNECTOR LEFT IGNITION E FSEE 

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