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The 2 ignition exciters are installed on the fan case, between the 3 and 4 o’clock positions.
A stainless steel protective housing, mounted on shock absorbers and grounded, encloses the electrical exciter components.
The housing is hermetically sealed, ensuring proper operation, whatever the environmental conditions.
The components are secured mechanically, or with silicon cement, for protection against engine vibration.
The ignition exciter electrical circuit consists of :
-An input circuit.
-
A rectifier and storage circuit.

-
A discharge circuit.

The A/C alternating input voltage is first rectified and then stored in capacitors.
In the discharge circuit, a spark gap is set to break down when the capacitors are charged, delivering a high voltage pulse at a regular rate.
Input voltage:  105-122 VAC  (115Vnominal). 
380-420Hz  (400 Hz nominal). 
Output voltage:  15-20KV  at the end of the 
ignition lead. 

EFG

 

CTC-201-173-02
EFFECTIVITY
74-00-00 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
IGNITION DISTRIBUTION SYSTEM
The purpose of the distribution system is to transmit the electrical energy delivered by the ignition exciters to produce sparks inside the combustion chamber.
The main elements of distribution are :
-
2 ignition lead assemblies, from the exciters to the
combustor case, at each spark igniter location.

-
2 spark igniters, located on the combustor case at
4 and 8 o’clock.

 

The two ignition lead assemblies are identical and interchangeable, and each connects one ignition exciter to one spark igniter.
A single coaxial electrical conductor carries the high tension electrical pulses to the igniter plug.
The portion of the lead assembly along the core, as well as the outer portion of the igniter, is cooled by booster discharge air.

EFG

 

CTC-201-175-02
EFFECTIVITY
74-00-00 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
IGNITION DISTRIBUTION SYSTEM
The ignition lead assembly consists of an elbow, an air inlet adapter, an air outlet and terminals that are interconnected with a flexible conduit assembly.
The flexible conduit consists of an inner copper braid, a convoluted conduit, and a nickel outer braid. Within this metal sleeve is a stranded, silicon-insulated wire.
Booster air is introduced at the air adapter assembly, into the cooled section of the conduit, and exits at the connection with the igniter.

EFG

IGNITION LEAD
　
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