(2)
Jumper wires

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

 (2)
AMM 78-31-00/201, Thrust Reverser System

 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

 (2)  
Access Panels
 5737L Engine No. 1 - Right Fan Cowl Panel
 5738L Engine No. 1 - Left Thrust Reverser
 5739L Engine No. 1 - Right Thrust Reverser
 5746L Engine No. 1 - Left Fan Cowl Panel
 5837R Engine No. 2 - Right Fan Cowl Panel
 5838R Engine No. 2 - Left Thrust Reverser
 5839R Engine No. 2 - Right Thrust Reverser
 5846R Engine No. 2 - Left Fan Cowl Panel

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////

PLUG D420 4 O'CLOCK POSITION
Engine Start/Igniter Select Switch Test Figure 501
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
D.  Do these Steps to Prepare for the Procedure
 S 865-024-C00
 (1)  AIRPLANES WITHOUT THE ENGINE INSTRUMENT SYSTEMS (EIS); Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center
 1) For engine No. 1:
 a) ENG 1 N2 TACH INDICATION

 2)  For engine No. 2: a) ENG 2 N2 TACH INDICATION
 S 865-027-C00
 (2)  AIRPLANES WITH EIS; Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center
 1) For engine No. 1:
 a) EIS PRIMARY 2 (E1)

 2)  For engine No. 2:
 a) EIS PRIMARY 4 (E2)

 S 865-004-C00
 (3) Close these circuit breakers and attach DO-NOT-OPEN tags:
 (a)  P6 Load Control Center
 1)  For engine No. 1:
 a) ENG 1 R IGN
 b) ENG 1 L IGN
 c) ENG 1 START VALVE

 2)  For engine No. 2:
 a) ENG 2 R IGN
 b) ENG 2 L IGN
 c) ENG 2 START VALVE
 d) INDICATOR SECT 2
 e) INDICATOR SECT 5

 S 015-030-C00
 (4) Open the right and left fan cowl panel (AMM 71-11-02/201).
 S 015-031-C00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURY TO PERSONS OR DAMAGE TO THE EQUIPMENT CAN OCCUR.
 (5) Open the right and left thrust reverser (AMM 78-31-00/201).
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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 ////////////////////////
E. Procedure (Fig. 501)
 S 035-006-C00
 (1)  
Disconnect these plugs, D420 and D1214, on the ignition exciter unit for the applicable engine switch.
　
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