CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
HYDROMECHANICAL UNIT
The HMU has different functions :
-
It provides internal calibration of fuel pressures.
-
It meters the fuel flow for combustion.
-
It provides the fuel shut-off and fuel manifold
minimum pressurization levels.
-
It by-passes unused fuel.
-
It provides mechanical N2 overspeed protection.
-
It delivers the correct hydraulic power source to various engine fuel equipment.
The HMU has :
- Two electrical connectors to ECU channels A and B.
-An electrical connection between the shut-off
solenoid and the A/C.
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CTC-201-019-02
EFFECTIVITY
73-21-18 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
HYDROMECHANICAL UNIT
To manage and control the engine systems and equipment, the HMU houses two different internal subsystems, which are :
-
The fuel metering system, including the fuel metering
valve, the delta P valve, the pressurization valve,
the by-pass valve, and the overspeed governor
system.
-
The servo-mechanism area, including the pressure
regulation system, the servo flow regulation
system, solenoid valves and torque motors to
supply fuel to the various valves and actuators of
the engine.
EFG
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CTC-201-020-02
EFFECTIVITY
73-21-18 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
HYDROMECHANICAL UNIT
General description.
To achieve all the different engine functions, the HMU is fitted with:
6 torque motors (TM) for the control of :
-
FMV.
-
VSV.
-
VBV.
-
TBV.
-HPTCC
-LPTCC.
2 solenoids (S) for :
-BSV controls.
-A/C shut-off valve signal generation.
(this solenoid is not controlled by the ECU, but by the
A/C Master Lever).
1 resolver (R), to track the FMV position.
2 sets of switches (one set for the overspeed governor, one for the pressurizing valve).
Note : The resolver and the switches are dual devices.
i.e. their feedback indication is provided to both ECU channels.
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