-The exchanger core, or matrix, where heat is
transferred.
- The cover, which supports the fuel lines.
-A screen, which catches particles in suspension in the oil circuit.
Fuel from the pump wash filter enters the unit and passes through aluminium alloy, ‘U’-shaped tubes immersed in the oil flow. The tubes are mechanically bonded to a tube plate, which is profiled to the housing and end cover flanges. The fuel then exits the unit and is directed to the HMU servo mechanism area.
Oil from the lubrication unit enters the case, is filtered, and then passes into the matrix where it circulates around the fuel tubes.
At the matrix outlet, the oil is directed to the main oil/fuel heat exchanger. If the filter is clogged, or if the differential pressure across the filter is too great, a by-pass valve, installed in the main oil/fuel heat exchanger, will open.
Oil will then be directed to the main oil/fuel heat exhanger oil outlet port, pass through the servo fuel heater and go back to the engine oil tank.
Servo fuel heater casing.
At the flanged end of the case, facing outward, there are two square oil inlet/outlet mounting pads.
The flange has threaded inserts to allow the installation of the cover attachment screws.The mounting flange is part of the housing casting, and has 6 holes to accommodate the main oil/fuel heat exchanger securing studs.
A side port chamber is provided to run the oil by-pass flow from the main oil/fuel heat exchanger to the oil outlet line connected to the engine oil tank.
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CTC-201-078-02
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
THIS PAGE INTENTIONALLY LEFT BLANK
EFG
HYDROMECHANICAL UNIT
EFFECTIVITY
73-21-18 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
HYDROMECHANICAL UNIT
The Hydro-Mechanical Unit (HMU) transforms electrical signals sent from the ECU into hydraulic pressures in order to actuate various actuators used in engine control.
It is installed on the aft side of the accessory gearbox at the 7 o’ clock position and mounts directly onto the fuel pump.
EFG
HYDROMECHANICAL UNIT LOCATION
CTC-201-018-00
EFFECTIVITY
73-21-18 Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
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