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ECES E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E 5. IDG Oil Cooler Assembly
Location of Servo Fuel Heater on Engine Figure 008
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Servo Fuel Heater Figure 009
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Main Oil/Fuel Heat Exchanger and Servo Fuel Heater Figure 010
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A. General
(Ref. Fig. 011)
(1) The purpose of the cooler assembly is to cool oil coming from the Integrated Drive Generator (IDG). The heat generated is transferred to the fuel coming from the HMU and returning to the oil/fuel heat exchanger. The IDG oil cooler is located approximately at the 9:00 o'clock position, left-hand side of the fan inlet case and between Flanges E and F (above the oil tank).
B. Description (Ref. Fig. 012) The IDG oil cooler has a cylindrical shape. It is composed of an oil housing, a fuel housing and a matrix.
(1) The oil housing has:
- One OIL-IN port and one OIL-OUT port.
- One oil DRAIN port.
- Two mounting lugs
(2) The fuel housing has:
- One FUEL-IN port.
- One FUEL-OUT port.
- One fuel pressure-relief valve connected in parallel with the fuel inlet and outlet ports. If the matrix is clogged, the pressure relief valve opens and bypasses the fuel flow to the fuel tank, via the FRV.
(3) The matrix It contains a tubeplate, 7 baffles and aluminium alloy fuel tubes (U-shaped). The fuel tubes are attached to the plate. The matrix permits 8 oil flow paths and 2 fuel flow paths.
C. Operation
(Ref. Fig. 012)
(1) Oil flow path The oil flows through the tube bundle where, by thermal conduction, it releases its calories to the fuel tubes. The temperature range at the oil outlet is -40 deg.F (-40 deg.C) to 367 deg.F (186 deg.C).
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Location of IDG Oil Cooler
Figure 011
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INTENTIONALLY BLANK
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IDG Oil Cooler Figure 012 (SHEET 1)
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IDG Oil Cooler Figure 012 (SHEET 2)
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(2) Fuel flow path.
- The fuel flows inside the fuel tubes and takes away the heat released by the oil. If the differential pressure between the inlet and the outlet of the matrix is more than 14.5 psi (100 kPa):
- the pressure relief valve opens,
- the fuel flow bypasses the matrix and returns to the fuel tank via the FRV.
6. Fuel Return Valve Assembly
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A. General
(Ref. Fig. 013)
PRE SB CFM 73-0096
(1) The purpose of the fuel return valve is to return fuel back to the tank. It mixes hot fuel flowing from the IDG fuel/oil heat exchanger and cold fuel from the LP fuel pump. It is controlled by the ECU based on engine oil temperature which is correlated with the IDG oil temperature. It provides a stop function for the recirculated fuel, when no recirculation is commanded by the ECU or when the engine is shut down through HMU hydraulic signal.
END OF PRE SB CFM 73-0096
POST SB CFM 73-0096
(2) The purpose of the fuel return valve is to return fuel back to the tank. It mixes hot fuel flowing from the IDG fuel/oil heat exchanger and cold fuel from the LP fuel pump. It is controlled by the ECU based on engine oil temperature which is correlated with the IDG oil temperature. It provides a stop function for the recirculated fuel, when no recirculation is commanded by the ECU.
END OF SB CFM 73-0096
(3) The fuel return valve is located on the left-hand side of the fan inlet case, at the 10:00 o'clock position and between flanges E and F (above the IDG oil cooler). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM 发动机燃油和控制 ENGINE FUEL AND CONTRO(19)
