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 74-00-00
 ALL  ú ú C01 Page 509 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IGNITION POWER SUPPLY - DESCRIPTION AND OPERATION
_________________________________________________
 1.  General
_______
 A.  The ignition power supply consists of two independent ignition exciters (Fig. 1) . The exciters provide starting and continuous duty ignition on demand. Each exciter is capable of independent operation and alternate use of ignition circuits is recommended. Selection is made by an engine igniter selector switch in the cockpit.
 2.  Description
___________
 A.  The two independent ignition exciters are mounted on the inlet fan case with resilient shock mounts at the 2 o'clock position. Each exciter has an input and output connector. Two types of exciters are available. Both types are unidirectional.
 B.  The high energy exciter output is 15-20 kv, with a spark rate of 2 sparks per second. Energy delivered is 2 joules per spark.
 C.  The low energy exciter output is 14-18 kv, with a spark rate of 1 spark per second. Energy delivered is 1.2 joules per spark.
 3.  Operation
_________
 A.  The ignition exciters operate on 105 to 122 volts ac, 380 to 420 Hz input. The power is transformed, rectified and discharged in the form of capacitor discharge pulses through the ignition leads to the spark igniters.
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 74-11-00
 ALL  ú ú C02 Page 1 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
JUMPER BOND  ASEE IGNITION EXCITER 
LEFT LEAD IGNITION  EXCITER UPPER IGNITION 
INPUT CONNECTOR ELECTRICAL 
RIGHT CONNECTOR IGNITION LEAD LEAD IGNITION  POWER SUPPLY CABLE 
CONNECTOR IGNITION LEAD  POWER SUPPLY CABLE INPUT CONNECTOR ELECTRICAL 
JUMPER BOND 
EXCITER LOWER IGNITION 
A Ignition Power Supply Figure 1 G-M56-MM-0741(1)-00-B 

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 74-11-00
 ALL  ú ú C01 Page 2 ú Nov 15/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
IGNITION EXCITER - REMOVAL/INSTALLATION
_______________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task removes the ignition exciter and the second task installs the ignition exciter.
 B.  Two ignition exciters are installed on each engine. The removal/installation procedure is the same for the two exciters.
 TASK 74-11-01-004-001-C00
 2.  Remove the Ignition Exciter
___________________________
 A.  References
 (1)  AMM 71-11-02/201, Fan Cowl Panels
 B.  Access
 (1)  
Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 502/503 Fan Cowl Panels - Engine No. 1
 602/603 Fan Cowl Panels - Engine No. 2
 506 Engine No. 1
 606 Engine No. 2

 (2)  
Access Panels
 5737L Engine No. 1 - Right Fan Cowl Panel
 5746L Engine No. 1 - Left Fan Cowl Panel
 5837R Engine No. 2 - Right Fan Cowl Panel
 5846R Engine No. 2 - Left Fan Cowl Panel

 

 C.  Remove the Exciter
 S 864-002-C00
 (1)  If the left (upper) exciter is to be removed, open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6 Load Control Center
 1) L IGN

 S 864-003-C00
 (2)  
If the right (lower) exciter is to be removed, open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  P6 Load Control Center
 1) R IGN

 (3)
　
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