Bleed air comes from which part of the compressor?

Bleed air comes from which part of the compressor?

• A. The intake
• B. The exhaust
• C. The turbine
• D. Any of the various pressure stages of the compressor

Answer: (D)

Bleed air is the pressurized air taken from the compressor section of the engine to supply pneumatic systems such as cabin pressurization, environmental control, anti-ice, and starting air. Because those systems require different pressures and temperatures, the bleed air can be tapped from various stages of the compressor. Early stages provide lower pressure (and lower temperature rise), while later stages provide higher pressure and hotter air; the bleed valves and ducting select and regulate which stage(s) contribute to the system. This is why bleed air is sourced from any of the different pressure stages of the compressor, not from the intake, exhaust, or turbine.

Bleed air is the pressurized air taken from the compressor section of the engine to supply pneumatic systems such as cabin pressurization, environmental control, anti-ice, and starting air. Because those systems require different pressures and temperatures, the bleed air can be tapped from various stages of the compressor. Early stages provide lower pressure (and lower temperature rise), while later stages provide higher pressure and hotter air; the bleed valves and ducting select and regulate which stage(s) contribute to the system. This is why bleed air is sourced from any of the different pressure stages of the compressor, not from the intake, exhaust, or turbine.