SEE A
FUEL CONTROL SYSTEMS- D&O 2
(73-21-00/001)

CUTOFF
NC

INTERNALS SAME AS RIGHT
IGNITION EXCITER

NO
NOT CUTOFF
ENG 2 START LEVER
LEFT IGNITION

LEFT IGNITER
SWITCH

8 O'CLOCKPOSITION
LEFT IGNITION EXCITER (UPPER UNIT)
CUTOFF
NC

NO
NOT CUTOFF
ENG 2 START LEVER
RIGHT IGNITION SWITCH

P8 AFT CONTROL STAND RIGHT IGNITER4 O'CLOCKPOSITION
ENGINE STARTING
RIGHT IGNITION EXCITER (LOWER UNIT)
1
SYSTEM- D&O,
(80-11-00/001, FIG.6)
ENGINE NO. 2
ENGINE START
OFFBOTH OFF
GRD CONTGRD CONT
FLT
FLT IGN IGN
CUTOFF
L R
NC
NO 12
NOT CUTOFF
ENG 1 START LEVER INTERNALSLEFT IGNITION
SAME AS  A
IGNITER PLUG
SWITCH ENGINE NO. 2
IGNITION
CUTOFF
EXCITERS
NC
POWER
NO
MANAGEMENTNOT CUTOFF CONTROL
ENG 1 START LEVER ENGINE NO. 1RIGHT IGNITION OIL TANKSWITCH
P8 AFT CONTROL STAND
1  SWITCH MAGNETICALLY HELD IN GROUNDSTART POSITION UNTIL N2 REACHES 46.33% RPM
FUEL CONTROL SYSTEMS- D&O 2
(73-21-00/001) 2 AIRPLANES WITH ENGINE IDLE INDICATION

GRDOFF (80-11-00/001, FIG.6)
CONTFLT
(80-11-00/001, FIG.6)
L IGN
BOTH

GRD
R IGN OFFCONTFLT
ENGINE IGNITION SWITCH ENGINE 1 START SWITCHP5 FORWARD OVERHEAD PANEL
Engine Ignition Control System Schematic
Figure 2A

115V AC
STBY BUS ENGINE 2R IGN
115V AC
TRANS
BUS 2

ENGINE 2L IGN 115V AC
STBY BUS ENGINE 1R IGN
115V AC
TRANS
BUS 1

ENGINE 1L IGN
P6-2 LOAD CONTROL CENTER
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 74-31-00
 ALL  ú ú C01 Page 4 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B.  To maintain combustion during flight, one or two spark igniter can be energized by moving the applicable engine start switch to CONT position and engine igniter selector switch to IGN L, IGN R or BOTH position and start lever to the IDLE detent. The IGN L position provides power to the proper ignition exciter to energize the spark igniter located at the engine 8 o'clock position. The IGN R position provides power to the proper ignition exciter to energize the spark igniter located at the engine 4 o'clock position. The BOTH position provides power to the 2 ignition exciters to energize the two spark igniters.
 C.  To initate ignition for an inflight start of an engine which has been shut down, check that L IGN and R IGN circuit breakers on the P6-2 circuit breaker panel for the applicable engine are closed. Place the applicable engine start switch in the FLT position and advance the start lever to the IDLE detent. After engine startup, the engine start switch is returned to the OFF position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 74-31-00
 ALL  ú ú C01 Page 5 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE START/IGNITER SELECT SWITCHES - ADJUSTMENT/TEST
______________________________________________________
 1.  General
_______
 A.  This test checks to make sure all switches, solenoid, cams, springs, etc., within the four position engine start switch and the three position igniter select switch function correctly.
 B.  This test examines the circuitry between the start switch and the interface with the engine.
 C.  This test is applicable to either engine.
 TASK 74-31-12-705-001-C00
 2.  Test the Engine Start and Igniter Select Switches
_________________________________________________
 A.  Equipment
　
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