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13 Cards in this Set
- Front
- Back
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What is the purpose of a bypass valve in an engine driven fuel pump? |
To allow the fuel to go around the engine driven pump in the case of an emergency operation should the pump fail |
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On which side of the firewall is the engine fuel shut off valve located? |
On the side away from the engine |
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What are three purposes for the boost pumps in an aircraft fuel system? |
Pressurize fuel in the fuel lines for starting, prevent vapor lock, and to transfer fuel from one tank to the other |
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What kind of boost pumps is used in most aircraft fuel systems? |
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 vapor lock in an aircraft system? |
When the fuel becomes too hot enough that it boils and vaporizes to form a lock in the fuel lines preventing the flow of the liquid fuel |
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What is done in most aircraft fuel systems to prevent vapor lock |
The use of boost pumps to pressurize the fuel in the lines and force the fuel into the fuel metering system |
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What is meant by compensated relief valves in an engine driven fuel pump? |
A relief valve that is acted upon by a diaphragm and a spring to keep the pump discharge pressure at a given amount higher than the pressure of the air entering the carburetor |
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What is done to an aircraft reciprocating engine if it has been operated on turbine engine fuel? |
It should be drained, and refilled with the proper fuel, perform a compression check, all cylinders undergo a borescope inspection, drain out the oil and filters examined, give the engine a complete run-up check |
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What are 2 main types of turbine engine fuel? |
Jet A, A1 kerosine base and jet B gasoline base |
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Why do some turbine engine fuel systems incorporate a fuel heater ? |
To keep the fuel warm enough so it's moisture content will not freeze and clog the filter |
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What are 2 reasons prist is used in turbine engine? |
As antifreeze and antibacterial agent |
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Why do some aircraft fuel filters have a built in relief valve?⁶ |
To allow unfiltered fuel to flow to fuel control device should the filter clog with ice or other contaminants |
