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 B.  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) (AMM 28-22-12).
 3.  Operation
_________
 A.  To initiate ignition for a ground start of an engine, close L IGN and R IGN circuit breakers on the P6-2 circuit breaker panel for the applicable engine (Fig. 2). Move the applicable engine start switch located on the pilot's overhead panel to the GRD position, engine igniter selector switch to IGN L, IGN R or BOTH position. Advance the applicable start lever on the pilot's control stand to the IDLE detent. This procedure closes the circuit to the selected ignition exciter where the voltage is stepped-up and directed to the spark igniters. At starter cutout speed, power to the ground start holding solenoid is removed and the start switch returns to the OFF position automatically.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ASEE 
ENGINE START 
LEVERS 
ENGINE START  SEE  B 
LEVER ACTUATED 
SWITCHES ACCESS 
PANEL 
ENGINE START 
LEVERS 
FWD 
IGNITION 
CAMS 
PILOTS' CONTROL STAND
IGNITION AND FUEL  A 
SHUTOFF CAMS 
FUEL 
SHUTOFF 
SWITCHES  START CONTROL DRUM 
1 
S91 
S90 
S89 
S88 

FWD
115V AC
IGNITION 1 REF 28-22-12/401
SWITCHES B
Engine Ignition Control System Equipment Location
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE STARTING 1
SYSTEM- D&O,(80-11-00/001, FIG.6)
GRD
SEE A(80-11-00/001, FIG.6)
OFF
CONTFLT
115V AC
STBY BUS
ENGINE 2
R IGN

CUTOFF
INTERNALS SAME AS RIGHTIGNITION EXCITER
NOT CUTOFF
115V AC
TRANS
ENG 2 START LEVER
LEFT IGNITION
LEFT IGNITERBUS 2
8 O'CLOCK
ENGINE 2

M421 LEFT IGNITION EXCITER (UPPER UNIT)
SWITCH
POSITION L IGN
CUTOFF
NOT CUTOFF
ENGINE 2 START SWITCH
ENG 2 START LEVERRIGHT IGNITIONSWITCH
RIGHT IGNITERP8 AFT CONTROL STAND
(80-11-00/001,
4 O'CLOCK
FIG. 6)
POSITION
L IGN
BOTH

M118 RIGHT IGNITION EXCITER (LOWER UNIT)
R IGN
ENGINE STARTING
1 ENGINE NO. 2
SYSTEM- D&O,(80-11-00/001, FIG.6)
GRD
ENGINE START
OFF
OFFBOTH OFF
GRD CONTGRD CONT
FLT FLT IGN IGN
LR
CONT
FLT
12
CUTOFF
NOT CUTOFF
A
115V AC
IGNITER PLUG
STBY BUS
ENG 1 START LEVER
LEFT IGNITION
INTERNALS
ENGINE 1
SAME AS  IGNITION
SWITCH
R IGN
ENGINE NO. 2 EXCITERS
ENGINE IGNITION SWITCH
115V AC
TRANS
POWER
BUS 1
CUTOFF
MANAGEMENT
ENGINE 1
CONTROL
L IGN
OIL TANK
NOT CUTOFF
ENG 1 START LEVER ENGINE NO. 1RIGHT IGNITIONSWITCH
ENGINE 1 START SWITCH  1 SWITCH MAGNETICALLY HELD IN GROUND
P6-2 LOAD CONTROL CENTER
P8 AFT CONTROL STAND
START POSITION UNTIL N2 REACHES 46.33% RPM
P5 FORWARD OVERHEAD PANEL
Engine Ignition Control System Schematic
Figure 2

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