Cooling Systems Flashcards
(28 cards)
Where can you find the maximum amount of cylinder fin area that can be removed in order to clean out a damaged area
Engine overhaul manual
What must be inspected on the cooling system of an air cooled engine
All of the baffles and air seals must be in place and in good condition
Why should an air cooled engine not run up to high power without the cowling installed
Engine depends on the cowling to force air through the cylinder fins to remove the excess heat
What is the purpose of cooling fins
To increase the surface area of the cylinder for cooling
What is the purpose of cowl flaps and how are they operated
Used to control the amount of airflow through the cowling. They are usually mechanically, electrically, or hydraulically operated
How does an augmenter cooling system work
An outer tube placed over the exiting exhaust gas creates a Venturi affect that draws more airflow over the engine, this provides additional cooling
Where should cowl flaps be positioned for ground operations
Fully open
What type of power is used to operate cowl flaps
Manual, hydraulic, or electrical
Why is cowl flaps adjustment important
To keep cylinder head temperatures within allowable limits
How are turbine engines cooled
Cooled by air passing through the engine
In a turbine engine where does bleed air come from that is used to cool bearings and other parts
Bleed air from the Engine compressor
What is the approximate percentage of air passing through a turbine engine that is used for cooling rather than combustion
Approximately 75%
What document describes the proper use of cowl flaps on an air cooled engine
Pilot operating handbook
What is the most common means of regulating the cooling air flow through a reciprocating engine
Use of cowl flaps
When should cowl flaps be kept in the fully open position
Normally during all ground run operations
What publication should be referred to before re-profiling cylinder cooling fins
Manufactures service manual or overhaul manual
What are the main reasons that excessive heat in a reciprocating engine is undesirable
It shortens the life of the engine parts, impairs lubrication and affects combustion
What is the source of air directed to engine bearings for cooling
Bleed air from compressor section of the engine
What type of materials are used to make insulation blankets for turbine engines
Made of stainless steel, layers of aluminum foil, fiber glass and silver foil
What areas of a turbine engine are cooled by the secondary air passing through the engine
Combustion chamber and the turbines
What is the purpose of an engine cowling, baffles and cowl air seals
Streamlines the engine to reduce drag, which forces the airflow over the cylinders for cooling
What is the purpose of an oil cooler bypass valve
It allows the thick oil to bypass the cooler when oil is cold
What is the purpose of an augmenter used in some reciprocating engine exhaust systems
To aid in cooling the engine
Cracks in cooling fins that do not extend into the cylinder head may be repaired by
Removing affected area and contour filing within limits
