Exhaust And Reverser Systems Flashcards
(24 cards)
What is an indication of an exhaust gas leak?
Flat gray or sooty black deposit in the area of the leak
What is the purpose of the exhaust system?
To remove high temperature noxious exhaust gases
Name two types of reciprocating engine exhaust systems:
Sort stack
Collector system
What drawback(disadvantage )in using collector type exhaust systems is more than offset when used on turbo charged 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?
Exhaust gas flow could be restricted, resulting in a loss of engine power
What type of exhaust system is used on turbocharged engines?
The collector system
Name the components of a typical turbine exhaust nozzle
Tail cone
Exhaust ducts
Support struts
How do you inspect the internal baffles and diffusers of an exhaust system?
By disassembling 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, and fire
What could happen if lead, zinc, or galvanized marks are made on an exhaust system?
They can cause a change in the molecular structure of the metal which could result in cracks when heated
What kind of material is normally used to make the muffler shrouds found in the exhaust system?
Stainless steel
What is a common cause of turbocharger wastegate sticking?
Coke deposits or carbon buildup
What are exhaust system coke deposits?
Excessive carbon buildup
What happens if the heat exchanger leaks exhaust gases into the induction system?
Loss of engine power
Where are the most common places to find cracks in an exhaust system?
At welded or clamped areas and at the flanges
Why are turbo charged exhaust system leaks vary damaging at certain altitudes?
Pressure differential will cause the leak to escape with torch like intensity
What is the result of changing the exhaust nozzle area of a turbine engine?
The engines performance and exhaust gas temperature will change
What is the purpose of thrust reverses?
They help decelerate an aircraft after landing
How does the noise suppressor found on older turbo jet engines work?
It converts low frequency, sound into high frequency, sound which reduces the sound footprint
What are the two most commonly used types of thrust reversers?
Clamshell (or mechanically blocked)
Cascade (or aerodynamically blocked)
How much thrust do reversers produce compared to the engines full forward thrust?
Substantially less
What are the hazards of operating some thrust reversers at low ground speeds?
Ingestion of foreign objects
What is the primary function of an exhaust system (in regards to safety)?
To provide protection against the potential destructive action of exhaust gases
What is the function of the thermocouple probes in a turbine engine tailpipe?
To measure exhaust gas temperature
