Boeing 737-800 - Engine Start and Ignition System Schematic

737 Flight Crew Operations Manual
Engines, APU -
Engine System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
7.20.12 D6-27370-866-EGP
Engine Start and Ignition System Schematic
YK981 - YQ456
N2 ROTATION BELOW STARTER CUTOUT SPEED.
ENGINE BEING STARTED
CONDITION:
FUEL
BLEED AIR
AIR SYSTEM
FROM BLEED
AIR DRIVEN
STARTER
ENGINE START
R
IGN
L
IGN
BOTH
CONT
FLT
OFF
GRD
1
CONT
OFF
GRD
FROM FUEL
SYSTEM
RELAY
HOLDING
SWITCH
HIGH
SWITCH
CUTOUT
STARTER
IGNITER
RIGHT
CUTOFF
IDLE
FLT
COMBUSTOR
VALVE
START
ENGINE
BLEED
VALVE
IGNITER
LEFT
ENGINE
ELECTRONIC
CONTROL
N2
N
2
LOW
N
2
AIR
S
HMU
START VALVE
OPEN
September 15, 2016