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Reciprocation Engine Induction And Cooling Systems Oral Practice Test

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In some engines, bleed air vented to turbine engine bearings originates from which component?
Correct Answer:
The engine compressor.
Explanation:
Bleed air systems in gas turbine engines supply bearing compartments with clean, pressurized air to keep seals tight and to provide cooling. The air used for turbine engine bearings comes from the compressor section, typically bled from intermediate or high-pressure stages. This compressed air is routed to the bearing housing to maintain a positive pressure, purge contaminants, and help cooling. The other sources don’t provide the needed clean, pressurized air: the exhaust system handles hot gases away from the engine, the fuel pump deals with fuel delivery, and a carburetor isn’t used in turbine engines.

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