Which component is the source of bleed air vented to turbine engine bearings in some engines?

Which component is the source of bleed air vented to turbine engine bearings in some engines?

• A. The exhaust system.
• B. The carburetor.
• C. The fuel pump.
• D. The engine compressor.

Answer: (D)

Bleed air for bearing ventilation in some turbine engines comes from the compressor section. The compressor provides a controlled flow of pressurized air that can be tapped off to feed bearing cavities, cooling and purging oil and contaminants to keep the bearings sealed and functioning properly. The exhaust system carries away burnt gases and isn’t a source of bleed air. The carburetor is part of piston-engine fuel metering, not used for turbine engine bleed-air systems. The fuel pump simply delivers fuel and does not supply air. So the engine compressor is the source of that bleed air.

Bleed air for bearing ventilation in some turbine engines comes from the compressor section. The compressor provides a controlled flow of pressurized air that can be tapped off to feed bearing cavities, cooling and purging oil and contaminants to keep the bearings sealed and functioning properly. The exhaust system carries away burnt gases and isn’t a source of bleed air. The carburetor is part of piston-engine fuel metering, not used for turbine engine bleed-air systems. The fuel pump simply delivers fuel and does not supply air. So the engine compressor is the source of that bleed air.