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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The ignition exciters supply power to spark igniters.
General
The ignition exciters change 115v ac to 20,000v dc. The output of
the ignition exciter is 14.5 to 16 joules. The spark igniter uses
this power to ignite the fuel/air mixture in the combustion
chamber. Usually, only one ignition exciter per engine operates
at a time.
Physical Description
A 115v ac electrical connector attaches to the forward face of
the ignition exciter. The ignition lead attaches to the aft face of
the ignition exciter.
The ignition exciters attach to the fan case with four
shockmounts.
Each ignition exciter has a bond jumper that attaches to the
engine.
Training Information Point
WARNING: MAKE SURE THAT THE IGNITION EXCITERS ARE
DE-ENERGIZED FOR A MINIMUM OF FIVE
MINUTES BEFORE YOU START WORK ON THE
IGNITION SYSTEM. THE IGNITION SYSTEM
VOLTAGE IS DANGEROUSLY HIGH. DO NOT
TOUCH THE ELECTRICAL CONTACTS. THE
IGNITION EXCITERS CAN HAVE AN ELECTRICAL
CHARGE EVEN WHEN NOT ENERGIZED. IF YOU
DO NOT OBEY THIS STEP, INJURY TO PERSONS
CAN OCCUR.
IGNITION - IGNITION EXCITER
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
74-00-00-005
IGNITION - IGNITION EXCITER
IGNITION - IGNITION EXCITER
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
74-00-00-005
Purpose
The spark igniters supply an electrical spark to ignite the fuel/
air mixture in the combustion chamber.
The ignition leads transmit power from the ignition exciters to
the spark igniters.
General Description
Each spark igniter has its own ignition lead. Air goes around
each ignition lead to decrease the temperature of the lead.
Ignition Lead Cooling
Each ignition lead goes into an air manifold at the 6:00 position
at the aft end of the fan case. Booster air (low pressure
compressor exhaust air), makes each ignition lead cool. The
booster air goes into the air manifold and moves around the
inner part of the ignition lead shroud. Booster air comes out of
the spark igniter end of the ignition lead to cool the spark
igniter.
Spark Igniters
Each spark igniter installs into an adapter at the 4:00 and 8:00
positions on the engine. The spark igniter electrode is inside the
combustion chamber.
IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS
EFFECTIVITY
GUN ALL 74-00-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
74-00-00-006
IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS
IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS
EFFECTIVITY
GUN ALL 74-00-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
74-00-00-006
THIS PAGE IS INTENTIONALLY LEFT BLANK
IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS
74-00-00
Page 22
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the components that operate the ignition system:
* Start levers
* Engine start switches
* Ignition selector switch
* EEC.
The ac transfer bus 1 supplies 115v ac electrical power to the
EEC for the left ignition exciter. The ac standby bus supplies
115v ac electrical power to the EEC for right ignition exciter. The
left ignition exciter for engine 2 uses power from ac transfer bus
2. The right ignition exciter uses the ac standby bus.
The EEC controls power to the ignition exciters. Input from the
flight compartment components give manual control. The EEC
has internal logic for automatic ignition system control.
Manual Control
The EEC and the CDS/DEUs monitor the position of these flight
compartment components:
* Ignition selector switch
　
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