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12 Cards in this Set
- Front
- Back
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What is meant by pressure cooling of an aircraft engine? |
Cooling air is forced through baffles and cylinder fins due to pressure difference in the low-pressure section and high-pressure section of the engine |
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What is the purpose of an augmentor tube in the cooling system of a reciprocating engine? |
It uses the velocity of exhaust gases to produce low-pressure on one side of the engine that is used to pull cooling air through the engine |
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Where is the highest temperature located in a turbine engine? |
The inlet of the high-pressure turbine |
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How are the turbine inlet guide vanes and the first stage blades in some turbine engines cooled? |
High-pressure compressor bleed air flows through them |
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Which side of an air-cooled engine cylinder has the greatest amount of cooling fins? |
The side where the exhaust valve is located |
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What should be done to repair a bent cooling fin in a cast aluminum cylinder head? |
Normally if it doesn't restrict air flow, nothing, because attempting to straighten can break it easily |
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What should be the position of the cowl flaps of a reciprocating engine when it's run on the ground? |
Wide open |
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What is the function of the majority of the air flow that passes through a turbine engine? |
For cooling |
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How does metallic sodium in an exhaust valve aid in transferring heat? |
It melts when the engine is running and sloshes up and down as the valve operates by doing so, transfers heat through the valve stem to the cylinder head |
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How is the structure around a turbine protected from excessive heat from the engine? |
By use of insulating blankets |
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What is the function of blast tubes installed in a pressure cooling system of a reciprocating engine? |
Directs cooling air to the magnetos and 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 the turbine engine? |
Fiberglass sandwiched between metal foil |
