Powerplant - Cooling Systems Flashcards
What is the most common means of regulating the cooling air through a radial engine?
By the use of cowl flaps
What is the purpose of the fins on engine cylinders?
To increase the effective size of the cylinder for cooling
What other engine characteristics are designed to aid in engine cooling besides cooling fins?
The engine cowling and baffles are designed to force air over the cylinder cooling fins
What should be done to cylinders when too much of the cooling fin area is broken off?
The cylinder should be replaced because it cannot cool properly and a hotspot will develop
When should cowl flaps be kept in the fully open position?
Normally during all ground operations
What publication should be referred to before reprofiling cylinder cooling fins?
The manufacturers service or overhaul manual should be used to obtain the allowable limits
What sources are used to operate the cowl flaps?`
Electrical power, hydraulic power or manually
What are the main reasons that excessive heat in a reciprocating engine is undesirable?
Heat shortens the life of the engine parts, impairs lubrication and effects combustion
What is the source of the air that is directed to engine bearings for cooling?
Bleed air from the compressor section of the engine
What types of materials are used to make insulation blankets for turbine engines?
Layers of stainless steel, aluminum foil, fiberglass and silver foil
What areas of a turbine engine are cooled by the secondary air passing through the engine?
The combustion chambers and the turbines
What is the purpose of the engine cowling?
It streamlines the engine to reduce drag and it forms an envelope around the engine, which forces the air around and between the cylinders to cool them
