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18 Cards in this Set
- Front
- Back
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What is meant by pressure cooling of an aircraft engine? |
when air is forced to flow through baffles and cylinder fins by a pressure differential across the engine. |
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What is the purpose of an augmentor tube in the cooling system of an aircraft reciprocating engine? |
The augmentor tube uses exhaust gases to create low pressure on one side of the engine which helps pull cooling air through it. |
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Where is the highest temperature located in a turbine engine? |
At the inlet to the high–pressure turbine.
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How are the turbine inlet guide vanes and the first–stage turbine blades in some turbine engines cooled?
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High–pressure compressor bleed air flows through the hollow guide vanes and hollow turbine blades. |
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Which side of an air–cooled engine cylinder has the greatest amount of cooling fins?
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The side with the exhaust valve |
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What should be done to repair a bent cooling fin in a cast aluminum cylinder head?
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It is normally best to leave a bent cast fin alone if it does not restrict the flow of air. Cast fins are brittle and could break off.
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What is used in a helicopter to increase the amount of cooling air that flows over the engine cylinders?
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A belt–driven fan.
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What should be the position of the cowl flaps on a reciprocating engine when it is run on the ground?
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They should be wide open |
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What is the function of the majority of the air that passes through a turbine engine?
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Most of the air is used for cooling. |
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How does metallic sodium in an exhaust valve aid in transferring heat?
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transfers heat from the valve head to the stem |
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How is the structure around a turbine engine protected from excessive heat from the engine?
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An insulating blanket |
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What is the function of blast tubes that are installed in a pressure cooling system of a reciprocating engine?
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they direct cooling air to the magnetos and the generator. |
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Of what material is the insulation blanket made that is used to protect the aircraft structure from the heat produced by a turbine engine?
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Fiberglass sandwiched between sheets of metal foil.
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What must be inspected on the cooling system of an air–cooled engine?
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All baffles and air seals |
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Why should an air–cooled engine not be run up to high power without the cowling installed? |
The engine depends on the cowling to force air through the cylinders fins to remove the excess heat |
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Why do some air–cooled engine installations have cowl flaps? |
To produce a low pressure on one side of the engine to pull air through the cooling fins on the cylinders
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Where can you find what is the maximum amount of cylinder fin area that can be removed in order to clean out a damaged area?
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Engine overhaul manual
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What document describes the proper use of cowl flaps on an air–cooled engine?
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Pilot's Operating Handbook |
