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INTRO Page 11
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
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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
ELECTRONIC CONTROL UNIT
ECU Location.
The ECU is a dual channel computer housed in an aluminium chassis, which is secured on the right hand side of the fan inlet case.
Four mounting bolts, with shock absorbers, provide isolation from shocks and vibrations.
Two metal straps ensure ground connection.
ECU Cooling System.
To operate correctly, the ECU requires cooling to maintain internal temperatures within acceptable limits.
Ambient air is picked up by an air scoop, located on the right hand side of the fan inlet cowl. This cooling air is routed up to the ECU internal chamber, around channel A and B compartments, and then exits through an outlet port in the fan compartment.

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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ELECTRONIC CONTROL UNIT
ECU architecture.
The ECU has three compartments :
-The main compartment houses channel A and
channel B circuit boards and a physical partition
separates them. The motherboard, accessed
through the front panel, accomodates :

-Electrical connectors.
-Ignition relays.
-Hardwired lightning protection assemblies.

- Two pressure subsystem compartments house
pressure transducers. One subsystem is dedicated
to channel A, the other to channel B.

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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ELECTRONIC CONTROL UNIT
Front Panel Electrical Connectors.

There are 15 threaded electrical connectors located on the front panel.
Each connector features a unique key pattern which only accepts the correct corresponding cable plug.
The connectors are identified through numbers from J1 to J15 marked on the panel.
All engine input and command output signals are routed to and from channels A and B, through separate cables and connectors.
　
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