What is the purpose of the exhaust system?
Remove high temperature gases.
Name two types of reciprocating engine exhaust systems.
Short stack and collector system.
What drawback in using collector type exhaust systems?
Loss of horsepower due to the exhaust back pressure.
What could result if the internal baffles or diffusers in an exhaust system fail?
Exhaust gases restricted causing loss of engine power.
What type of exhaust system is used on turbocharged engines?
Collector’s system.
What kind of material is normally used to make the muffler shrouds found in the exhaust system?
Stainless steel.
How do you inspect the internal baffles and diffusers of an exhaust system?
Disassembling exhaust and visually inspecting the components.
Why is an exhaust system failure considered as a severe hazard?
Results in carbon monoxide poisoning, loss of engine power or fire.
What could happen if flood sink or galvanized marks are made on an exhaust system?
Cause corrosion to the structure, could result in cracks when heated.
What happens if the heat exchanger leaks exhaust gases into the induction system?
Loss of engine power.
What is an indication of an exhaust gas leak?
Flat gray or city black deposit in leak area.
Where are the most common places to find cracks in an exhaust system?
Welded or clamped areas and the flanges.
What is a common cause of turbocharger wastegate sticking?
Coke deposits or carbon buildup.
Why are turbocharged exhaust system leaks very damaging at high altitudes?
Pressure differential causes the leak to escape with torch-like intensity.
What are exhaust system coke deposits?
Carbon buildup.
What is the result of changing the exhaust nozzle area of a turbine engine?
Engine’s performance and EGT change.
Name the components of a typical turbine exhaust nozzle.
Tail cone, exhaust ducts and support struts.
What is the purpose of thrust reversers?
Helped decelerate aircraft after landing.
How does a noise suppressor found on older turbojet engines work?
Converts low frequency sound audible over great distance into high frequency sound reducing the sound footprint.
What are the two most commonly used types of thrust reversers?
Mechanically blocked and aerodynamically blocked.
How much thrust do the thrust reversers produce compared to the engine’s full forward thrust?
Substantially less.
What are the hazards of operating some thrust reversers at low ground speeds?
Ingestion of FOD and re-ingestion of hot exhaust gases.
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Reciprocating Engines10
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Recip Engines Operation Instruments, Maintenance And Overhaul27
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Turbine Engines23
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Turbine Operation Instruments/maint Overhaul11
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Induction Systems22
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Exhaust Systems22
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Engine Fuel And Metering37
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Electrical Start And Ignition Systems37
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Lubrication Systems21
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Cooling Systems14
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Propellers22
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Powerplant And Propeller Airworthiness Inspections10
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Powerplamt Troubleshooting2
