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23 Cards in this Set
- Front
- Back
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What is the purpose of the bypass valve in an engine–driven fuel pump? |
The bypass valve allows fuel to flow around the pump for starting and for emergency operation if the pump should fail. |
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On which side of the firewall is the engine fuel shutoff valve located? |
The shutoff valve must be on the opposite side of the engine. |
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What are three purposes for the boost pumps in an aircraft fuel system?
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To provide fuel pressure for starting the engine, to pressurize the fuel lines to prevent vapor lock, and to transfer fuel from one tank to another. |
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What kind of boost pump is used in most aircraft fuel systems?
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Electrically operated centrifugal pumps.
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Where does an engine–driven fuel pump direct the excess fuel from its pressure relief valve? |
Back to the inlet side of the pump. |
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What causes a vapor lock in an aircraft fuel system? |
when the fuel changes from liquid to a gas in the fuel delivery system. cause by the fuel evaporating from heat |
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What is done in most aircraft fuel systems to prevent vapor lock? |
Boost pumps in the fuel tank pressurize the fuel in the lines and force the fuel into the fuel delivery system. |
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What is meant by a compensated relief valve in an engine–driven fuel pump?
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A pressure relief valve that is acted upon by a diaphragm as well as a spring. |
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What is the purpose of the pressurizing and dump valve in the fuel system for a turbine engine?
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When the engine is shut down, the dump valve dumps all of the fuel from the manifold. |
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What should be done to an aircraft reciprocating engine if it has been operated on turbine engine fuel?
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all of the cylinders should be inspected with a borescope. The oil should be drained and the filters carefully examined. |
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What are the two basic types of turbine engine fuel?
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Jet A |
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Why do some turbine engine fuel systems incorporate a fuel heater?
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The fuel heater keeps ice crystals from forming in the fuel |
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What are two reasons Prist is used in turbine engine fuel?
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Prist is an antifreeze agent that is added to the fuel. It also kills the microbial growth in fuel tanks. |
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Why do some aircraft fuel filters have a built–in relief valve?
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This relief valve will open and allow unfiltered fuel to flow to the fuel control device if the filter should become plugged with ice or other contaminants. |
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What is meant by a compensated fuel pump?
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maintains the fuel pressure a specific amount above ambient air pressure |
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What would likely cause a recip equipped with a float carb to hesitate momentarily when the throttle is rapidly advanced from idle to full power?
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Malfunctioning accelerator pump |
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Why do aircraft fuel metering systems for recip have mixture controls?
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The mixture control allows the fuel to be decreased or increased due to altitude |
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What are the two types of fuel injection system used on modern recips?
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TCM and Bendix systems |
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What is used in the TCM fuel injection system to control the amount of fuel sent to the nozzles?
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Engine speed determines the injector pump output pressure. |
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What is used in the Bendix system to control the amount of fuel sent to the nozzles? |
Mass of the air entering the engine |
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Where are the fuel strainers normally located in an aircraft fuel system?
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the tank outlet, located at the lowest point in the system, and strainers in the carb or fuel injection system |
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What are two types of fuel heaters used in a jet transport aircraft?
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Air fuel and oil fuel |
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What kind of fuel boost pumps are normally installed inside the fuel tanks?
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Centrifugal pumps
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