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It controls the engine start sequence and prevents the engine from exceeding starting EGT limits (aircraft on ground).

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It manages the thrust according to 2 modes: manual and autothrust.

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It provides optimal engine operation by controlling compressor airflow and turbine clearances.

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It completly supervises the thrust reverser operation.

-Finally, it controls IDG cooling fuel recirculation to the aircraft tank.

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CTC-201-001-01
EFFECTIVITY
INTRO Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FADEC SYSTEM INTRODUCTION
FADEC components.
The FADEC system consists of :
-An Engine Control Unit (ECU) containing two
identical computers, designated channel A and
channel B. The ECU electronically performs engine
control calculations and monitors the engine’s
condition.

-A Hydro-Mechanical Unit (HMU), which converts
electrical signals from the ECU into hydraulic
pressures to drive the engine’s valves and
actuators.

- Peripheral components such as valves, actuators
and sensors used for control and monitoring.

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FADEC COMPONENTS
CTC-201-002-02
EFFECTIVITY
INTRO Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FADEC SYSTEM  INTRODUCTION
FADEC interfaces.
To perform all its tasks, the FADEC system communicates with the aircraft computers through the ECU.
The ECU receives operational commands from the Engine Interface Unit (EIU), which is an interface between the ECU and aircraft systems.
It also receives:
-Air data parameters (altitude, total air temperature,
total pressure and mach number) for thrust
calculation, from 2 Air Data and Inertial Reference
Units (ADIRU), connected to both ECU channels.

- The position of the Thrust Lever Angle (TLA).
The ECU also interfaces with other aircraft systems, either directly, or through the EIU.

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CTC-201-003-01
EFFECTIVITY
INTRO Page 7

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

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG
FADEC SYSTEM INTRODUCTION
FADEC design.
　
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