74-21-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
(b)  Remove residue using shop air.
 S 026-010-C00
 (8)  
Remove the spark igniter (AMM 74-21-02/401).

 S 216-011-C00

 (9)  
Examine the spark igniter shell as follows:

 (a)  
Look for worn areas where the combustion chamber ferrule
 touches the spark igniter.
 1) No more than 0.02 inch (0.51 mm) in depth is permitted.

 (b)  
Wear completely through the shell is not permitted.

 (c)  
Holes in the shell from internal arcs are not permitted.

 (d)  
If the limits in the steps above are exceeded, replace the
 spark igniter.

 S 216-012-C00
 (10) Examine the spark igniter tips as follows:
 (a)  Washer type electrode:
 1) Washers that are loose or not there are not permitted.
 2) Examine the outer shell as follows:

 a) Dimension X can not be more than 0.30 inch (7.62mm). b) Dimension Y can not be less than 0.10 inch (2.54 mm). 3) The depth of the electode tip can not be more than
 0.25 inch (6.35 mm).
 (b)  Pin Type electrode:
 1) Pins that are loose or not there are not permitted.
 2) Measure the depth of the electrode tip.

 a) If the electrode tip depth is more than 0.25 inch
 (6.35 mm), replace the spark igniter. 3) No carbon buildup on the electrode tip or the gap area is
 permitted. 4) Holes burned through the shell are not permitted. 5) Cracked or chipped areas on the ceramic insulator are not
 permitted. 6) Tips that have a crack or are damaged are not permitted.
 (c)  If the limits above are exceeded, replace the spark igniters.
 S 426-013-C00
 (11) Install the spark igniter (AMM 74-21-02/401).
 S 416-014-C00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU CLOSE THE
_______ THRUST REVERSER. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (12)
 Close the right and left thrust reverser (AMM 78-31-00/201).

 (13)
 Close the right and left fan cowl panel (AMM 71-11-02/201).

 S 416-015-C00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
ENGINE IGNITION CONTROL - DESCRIPTION AND OPERATION
___________________________________________________
 1.  General
_______
 A.  The ignition system for each engine is energized through an engine start switch, engine igniter selector switch, and start lever actuated switches. The start levers are located on the control stand (Fig. 1). The start lever actuated switches are below the control stand. The engine start switches and engine igniter selector switch is located on the forward overhead panel (Fig. 2). When the ignition system is energized, the ignition exciter produces a high voltage pulsating current to the spark igniters. The spark produced between the spark igniters electrodes vaporizes fuel droplets. The fuel-air mixture is brought to the proper temperature that is required for ignition.
 B.  Ignition for each engine for a ground start is initiated by moving the start lever to IDLE position, engine igniter selector switch to IGN L, IGN R or BOTH position and the start switch to GRD position.
 C.  Ignition for one engine igniter is accomplished by moving the start lever to IDLE position, engine start switch to GND or CONT and engine igniter selector switch to IGN L or IGN R position.
 D.  To initiate ignition for an inflight start of an engine which has been shut down, check that ignition circuit breakers are closed. The start lever is placed in IDLE detent and the start switch in FLT position.
 2.  Start Lever Actuated Switches
_____________________________
 A.  There are two start lever actuated ignition switches for each engine. The switches are mechanically actuated by the operation of the start levers. Two cams attached to a drum over which the start lever cable passes actuate the switches. As the cable is actuated by the start lever, the cam engages a follower on the switch actuating arm causing the switches to open or close.
　
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