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B.  Ignition for each engine for a ground start is initiated by placing the start lever to the IDLE position and the start switch in the GRD position (on airplanes with 20-4 Joule DC Starting and Continuous Ignition System).
C.  Continuous ignition for each engine is accomplished by placing the start lever in the IDLE position and the start switch in the LOW IGN position and (on airplanes with 20 Joule AC Twin Pack Ignition System) L IGN or R IGN 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 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.
B.  On airplanes equipped with control stand start drum fuel shutoff switches, one start lever actuated engine fuel shutoff valve switch is provided for each engine. A cam attached to the start drum engages the switch follower causing the switch to open or close (Fig. 1) (Ref 28-22-111).
504 
Jun 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  74-31-0 Page 1 

K90447
Ignition Control System Equipment Location  504 
74-31-0  Figure 1  Jan 20/83 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

EFFECTIVITY
AIRPLANES WITH 20-4 JOULE DC IGNITION SYSTEM

K90475
586  Engine Ignition Control System 
Nov 15/80  Figure 2 (Sheet 1)  74-31-0 
Page 3 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

EFFECTIVITY
AIRPLANES WITH 20 JOULE AC IGNITION SYSTEM

K90479
Engine Ignition Control System  586 
74-31-0  Figure 2 (Sheet 2)  Nov 15/80 
Page 4 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

3.  Operation
A.  Ignition for a ground start of an engine is initiated by closing engine ignition circuit breakers on P6-2 circuit breaker panel, placing the engine start switch, located on the forward overhead panel, in the GRD position, and advancing the start lever, located on the pilots’ control stand, to the IDLE detent. This procedure completes the circuit to the ignition exciter where the voltage is stepped up and directed to two igniter plugs, one each in combustion chambers number four and seven (Fig. 2). When the starter cutout switch breaks the circuit through the starter relay the start switch will return to the OFF position.
B.  Continuous ignition for an engine is accomplished by placing the start lever in the IDLE detent and the start switch in the LOW IGN position (airplanes with 20-4 Joule DC Starting and Continuous Ignition) this configuration supplies low energy ignition and fires only the igniter plug located in combustion chamber number seven. On airplanes with 20 Joule AC Twin Pack Ignition System, the L IGN position provides power to the proper ignition exciter to energize the igniter plug located in the number 7 combustion chamber. The R IGN position provides power to the proper ignition exciter to energize the igniter plug located in the number 4 combustion chamber.
CAUTION:  DO NOT EXCEED DUTY CYCLE OF EACH IGNITION EXCITER DURING INDIVIDUAL OPERATION OR DAMAGE TO EXCITER MAY RESULT.
C.  Ignition for an inflight start of an engine that has been shut down is accomplished by first ascertaining that the ignition circuit breakers are closed. Then by placing the start lever in the IDLE detent and the start switch in FLT position, the circuit is completed to the ignition exciter where the voltage is stepped up and directed to two igniter plugs, one each in combustion chambers number four and seven.
D.  On airplanes with 20-4 Joule DC Starting and Continuous Ignition, after the engine has started, the start switch can be moved to LOW IGN position to maintain continuous ignition. On airplanes with 20 Joule AC Twin Pack Ignition System, after the engine has started, the start switch can be moved to either L IGN or R IGN to maintain continuous ignition.
E.  If continuous ignition is not desired after engine startup the start switch is returned to OFF position.
May 15/79 74-31-0 Page 5
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

START LEVER SWITCHES - REMOVAL/INSTALLATION
1.  Prepare to Remove Start Lever Switches
　
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