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exciters. The ignition exciters supply power to the spark
igniters.
The engine starting system also uses the switch positions for
control.
See the engine starting chapter for more information.
(CHAPTER 80)
Electrical Power
The engine 1 ignition systems receive 115v ac from ac transfer
bus 1 and the ac standby bus. The EEC has internal switches
that control the 115v ac to the ignition exciters. The ignition
exciters change the 115v ac input to a dc voltage of
approximately 15,000 to 20,000v for the spark igniters. The
spark igniters give a spark for combustion. The ignition systems
of engine 2 receive ac power from ac transfer bus 2 and the ac
standby bus.
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
Each engine has a right and a left ignition system. These are the
components of each ignition system:
* Ignition exciter
* Ignition lead
* Air manifold
* Spark igniter.
Component Locations
The ignition exciters are on the right side, lower portion, of the
fan case.
The ignition leads go from the ignition exciters to the spark
igniters on the right and left sides of the engine.
The air manifold goes around the ignition leads. The air
manifold starts in the 6:00 strut and goes to the igniters.
The spark igniters are just forward of the fuel manifold, at the
4:00 position and the 8:00 position.
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EFFECTIVITY
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General
These components which control the ignition system are in the
flight compartment:
* Engine start switches
* Ignition selector switch
* Start levers.
Component Locations
The ignition selector switch and engine start switches are on
the forward overhead panel (P5).
The start levers are on the control stand.
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