Exhaust and Reverser Systems Flashcards
What is an indication of an exhaust gas leak?
A 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 gases
Name two types of reciprocating engine exhaust systems?
The short stack and the collector system
What 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 fails?
The flow of exhaust gases could be restricted resulting in loss of engine power
What type of exhaust system is used on turbo charged engines?
The collector system
Name the components of a typical turbine exhaust nozzle
Tail Cone, exhaust ducts, and 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 and loss of engine and 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 kind of material is normally used to make the muffler shrouds found in the exhaust system?
Stainless steel
What is a common cause of turbo charger wastegate sticking?
Coke deposits or carbon buildup
What happens if the heat exchanger leaks exhaust gases into the induction system?
There is a loss of engine power
What are exhaust system coke deposits?
Excessive carbon buildup
Where are the most common places to find cracks in an exhaust system?
At welded or clamped areas in at the flanges
Why are turbo charged exhaust system leaks very damaging at high 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 change
What is the purpose of thrust reversers?
They help decelerate an aircraft after landing
How does a noise suppressor found on older turbo jet engines work?
It converts low frequency sound into high frequency sound thus reducing the sound footprint
What are the two most common used types of thrust reversers?
The clamshell, which is mechanically blocked and the cascade, which is aerodynamically blocked
How much thrust do the reversers produce compared to the engines for 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 exhaust Cal pipe?
To measure EGT
