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22 Cards in this Set
- Front
- Back
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What is the purpose of the exhaust system? |
To remove high temperature noxious gases |
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Name two types of reciprocating engine exhaust systems? |
The short stack and the collector system |
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What drawback in using collector-type exhaust systems is more than offset when used on turbocharged engines? |
The loss of horsepower due to exhaust system back pressure |
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What could result if the internal baffles or diffusers in an exhaust system fail? |
The flow of the exhaust gasses could be restricted, resulting in a loss of engine power |
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What type of exhaust system is used on turbocharged engines? |
The collector system |
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What kind of material is normally used to make the muffler shrouds found in the exhaust system? |
Stainless steel |
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How do you inspect the internal baffles and diffusers of an exhaust system? |
By disassembling the exhaust system as necessary and visually inspecting the components |
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Why is an exhaust system failure considered a severe hazard? |
It can result in carbon monoxide poisoning, loss of engine power, or fire |
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What could happen if lead, zinc, or galvanized marks are made on an exhaust system? |
They cause a change in molecular structure, which could result in cracks when heated |
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What happens if the heat exchanger leaks exhaust gasses into the induction system? |
There is a loss of engine power |
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What is an indication of an exhaust gas leak? |
A flat grey or sooty black deposit in the area of the leak |
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Where are the most common places to find cracks in an exhaust system? |
At welded or clamped areas and at the flanges |
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What is a common cause of turbocharger waste gate sticking? |
Coke deposits or carbon buildup |
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Why are turbocharged exhaust system leaks very damaging at high altitudes? |
Pressure differential will cause the leak to escape with torch-like intensity |
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What are exhaust system coke deposits? |
Excessive carbon buildup |
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What is the result of changing the exhaust nozzle area of a turbine engine? |
The engine's performance and exhaust gas temperature change |
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Name the components of a typical turbine exhaust nozzle? |
The tail cone, exhaust ducts and support struts |
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What is the purpose of thrust reversers? |
They help decelerate an aircraft after landing |
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How does a noise suppressor found on older turbojet engines work? |
It converts low frequency sound, which is audible over great distance, into high frequency sound, thus reducing the sound footprint |
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What are the two most commonly used types of thrust reversers? |
The clamshell (or mechanically blocked) and the Cascade (or aerodynamically blocked) |
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How much thrust do the thrust reversers produce compared to the engine's full forward thrust? |
Substantially less |
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What are the hazards of operating some thrust reversers at low ground speeds? |
Ingestion of foreign objects stirred up by the exhaust gasses and re-ingestion of hot exhaust gasses |
