6 Exhaust Systems Flashcards
- What is the purpose of the exhaust system?
To remove high temp noxious gases.
- Name 2 types of reciprocating engine exhaust systems.
The short stack and the collector system.
- What drawback in using collector type exhaust systems is more than offset when used on turbo engines?
The loss of horsepower due to exhaust system back pressure.
- 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.
- What type of exhaust system is used on turbo engines?
The collector 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?
By disassembling the exhaust system as necessary and visually inspecting the components.
- Why is an exhaust system failure considered a severe hazard?
It can result in carbon monoxide poisoning, loss of engine power, or fire.
- 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.
- What happens if the heat exchanger leaks exhaust gasses into the induction system?
There is a loss of engine power.
- What is an indication of an exhaust gas leak?
A flat gray or sooty black deposit in the area of the leak.
- Where are the most common places to find cracks in an exhaust system?
At welded or clamped areas and at the flanges.
- What is a common cause of turbo wastegate sticking?
Coke deposits or carbon buildup.
- Why are turbo exhaust system leaks very damaging at high altitudes?
Pressure differential will cause the leak to escape with torch like intensity.
- What are exhaust system coke deposits?
Excessive carbon buildup.
- What is the result of changing the exhaust nozzle area of a turbine engine?
The engine’s performance and EGT change.
- Name the components of a typical turbine exhaust nozzle.
The tail cone, exhaust ducts, and support struts.
- What is the purpose of thrust reversers?
They help decelerate an aircraft after landing.
- 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.
- What are the 2 most commonly used types of thrust reversers?
The clamshell and the Cascade.
- How much thrust did 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 foreign objects stirred up by the exhaust gasses and reingestion of hot exhaust gasses.
