Bleed air is tapped from which part of a turbine engine?

• A. Compressor stages
• B. Turbine stages
• C. Intake plenum
• D. Exhaust

Answer: (A)

Bleed air comes from the compressor part of the engine. The compressor pressurizesAmbient air to a usable pressure and temperature for aircraft systems, giving a clean, reliable supply for things like cabin pressurization, environmental control, wing and engine anti-icing, and pneumatic starting. Taking air from the compressor stages provides air that is properly pressurized and clean, without combustion byproducts.

Exhaust air would be hot and laden with combustion gases, making it unsuitable for pneumatic systems. Air from the intake plenum isn’t reliably pressurized enough and can vary with engine operating conditions, so it wouldn’t meet system needs. Air from the turbine stages would be after combustion and also unsuitable. That’s why bleed air is tapped from the compressor stages to feed the aircraft’s pneumatic systems.