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over-torqued, the threads in the pump assembly can be
damaged. Damaged threads can cause large engine
fuel leaks.
The servo wash filter cleans the fuel that goes to the servo
section of the hydromechanical unit (HMU). There is a bypass
valve for this filter. If contamination clogs the wash filter, the
bypass valve opens. Fuel that goes through the bypass valve to
the HMU servo section does not go through the servo wash
filter. There is no indication to show if the bypass valve opens.
The servo wash filter is not a Line Replaceable Unit (LRU).
NOTE: A manufacturer certified repair facility must open the
fuel pump assembly to inspect or remove and replace
the servo wash filter.
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ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL PUMP ASSEMBLY
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL PUMP ASSEMBLY
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General
The integrated drive generator (IDG) oil cooler cools the IDG oil.
This also heats the engine fuel. Heating the fuel stops the
formation of ice from the water in the fuel. If there is ice in the
fuel, the fuel filter, the servo system components, and the fuel
nozzles could clog.
The IDG oil cooler has a bypass valve in the fuel path of the heat
exchanger. If the heat exchanger clogs, the fuel will bypass the
IDG oil cooler. This lets the engine continue to operate. There
are no direct indications of a clogged IDG oil cooler in the flight
compartment except for IDG disconnect due to oil over
temperature.
Location
The IDG oil cooler attaches to the fan case at the 7:00 position.
See the electrical chapter for more information on the IDG
cooling system. (CHAPTER 24)
ENGINE FUEL AND CONTROL - DISTRIBUTION - IDG OIL COOLER
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ENGINE FUEL AND CONTROL - DISTRIBUTION - IDG OIL COOLER
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General
The servo fuel heater heats the supply of fuel that goes to the
servo system in the hydromechanical unit (HMU). This function
also helps to cool the engine scavenge oil. The servo fuel
heater is a heat exchanger which uses the warmer scavenge oil
temperature to increase the servo fuel supply temperature.
Location
The servo fuel heater attaches to the engine oil/fuel heat
exchanger.
See the engine oil chapter for more information on the oil fuel
heat exchanger. (SECTION 79-20)
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ENGINE FUEL AND CONTROL - DISTRIBUTION - SERVO FUEL HEATER
ENGINE FUEL AND CONTROL - DISTRIBUTION - SERVO FUEL HEATER
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Purpose
The fuel nozzle filter collects contamination from the high
pressure fuel pump and the HMU before it can go to the fuel
nozzles. The inline filter attaches to the fuel flow transmitter
outlet.
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL NOZZLE FILTER
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ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL NOZZLE FILTER
　
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