The drive shaft assembly (8) rotates at the output shaft
(9)speed connected to the AGB.
During the starting sequence, pawls, installed in the drive
shaft, transfer the starter torque from the hub ratchet to
the drive shaft.
When the engine speed reaches the pawl liftoff speed
(4300 to 4500 rpm), the pawls disengage from the hub
ratchet, due to centrifugal force, thus disconnecting the
turbine wheel and gear set.
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
When the air supply is stopped, the turbine wheel and gear set coast down.
The rotating assembly incorporates a cutter ring
(13) which has 12 cutter pins. In case of bearing failure, the turbine wheel moves axially, comes into contact with the cutter ring and then stops rotating.
A containment ring (14) provides retention of any rotating part within the starter housing.
The lubrication of the starter is a wet sump splash system.
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ENGINE SYSTEMS Jan 03
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CTC-201-165-02
EFFECTIVITY
80-11-10 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
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EFG
IGNITION
EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
IGNITION GENERAL
The purpose of the ignition system is to ignite the air/fuel mixture within the combustion chamber.
The engine is equipped with a dual ignition system, located on the right-hand side of the fan case and both sides of the cores.
The ignition system has two independent circuits consisting of :
-
2 high energy ignition exciters.
-
2 ignition lead assemblies.
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2 spark igniters.
A current is supplied to the ignition exciters and transformed into high voltage pulses. These pulses are sent, through ignition leads, to the tip of the igniter plugs, producing sparks.
EFG
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CTC-201-171-00
EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
IGNITION EXCITERS
The ignition exciters, which are capacitor discharge type, use 115 VAC to produce high voltage pulses to energize the spark igniters .
The ignition exciters transform this low voltage input into repeated 20 KV high voltage output pulses.
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