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CTC-201-073-01
EFFECTIVITY
79-21-20 Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG
MAIN OIL FUEL HEAT EXCHANGER
The connections with the other systems are:
- An oil IN port from the servo fuel heater.
-An oil OUT tube to the oil tank.
- Two fuel ports connected with the fuel pump.
-A fuel return line from the HMU, through the IDG oil cooler.
The mechanical interfaces are the mating flanges with the fuel pump, the servo fuel heater, plus one other with a fuel tube.
Heat exchanger core.
The heat exchanger is a tubular design consisting of a removeable core, a housing and a cover.
The core has two end plates, fuel tubes and two baffles.
The fuel tubes are attached to the end plates and the baffles inside lengthen the oil circulation path around the fuel inlet tubes.
Sealing rings installed on the core provide insulation between the oil and fuel areas.
Heat exchanger housing.
The housing encloses the core, and the following items are located on its outer portion :
-An oil pressure relief valve, which by-passes the oil when the differential pressure across the oil portion of the exchanger is too high.
-A fuel pressure relief valve, which by-passes the fuel when the differential pressure across the fuel portion of the exchanger is too high.
- A drain port, for fuel leak collection from inter-seal cavities, that prevent oil cavity contamination.
-An optional fuel-out temperature probe port.
- Two attachment flanges; one with the fuel pump which also provides fuel IN and OUT passages, and one with the servo fuel heater which also provides oil IN and OUT tubes.
-One fuel IN port for fuel from the HMU, via the IDG oil cooler.
Maintenance practices
If there is fuel contamination in the oil, both the servo fuel heater and main oil/fuel exchanger must be replaced.

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CTC-201-075-01
EFFECTIVITY
79-21-20 Page 5
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
SERVO FUEL HEATER

EFFECTIVITY
73-11-20 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG
SERVO FUEL HEATER
The servo fuel heater is a heat exchanger which uses engine scavenge oil as the heat source to warm up fuel in the fuel control system. This prevents ice particles entering sensitive servo mechanisms.
　
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