Bleed Air System comprises which stages as its bleed air sources?

Bleed Air System comprises which stages as its bleed air sources?

• A. 5th-Stage Bleed Air and 10th-Stage Bleed Air.
• B. 14th-Stage Bleed Air and 15th-Stage Bleed Air.
• C. 3rd-Stage Bleed Air and 4th-Stage Bleed Air.
• D. 5th- and 10th-Stage Bleed Air and 14th-Stage Bleed Air.

Answer: (D)

Bleed air comes from multiple compressor stages to feed the airplane’s pneumatic systems (environmental control, starting, anti-ice, etc.) and the pressure you get depends on which stage you tap. In this design, the sources come from the 5th, 10th, and 14th stages. The 5th stage provides a solid mid-level pressure suitable for most systems during takeoff and climb. As you need more pressure for higher-demand functions like the air conditioning packs and certain anti-ice functions, the 10th stage supplies a higher pressure. For the highest-demand situations, such as high-altitude operation or when packs require maximum supply, the 14th stage provides the highest pressure bleed air. Using these three stages together gives enough range to meet pneumatic system demands across the flight envelope.

Bleed air comes from multiple compressor stages to feed the airplane’s pneumatic systems (environmental control, starting, anti-ice, etc.) and the pressure you get depends on which stage you tap. In this design, the sources come from the 5th, 10th, and 14th stages. The 5th stage provides a solid mid-level pressure suitable for most systems during takeoff and climb. As you need more pressure for higher-demand functions like the air conditioning packs and certain anti-ice functions, the 10th stage supplies a higher pressure. For the highest-demand situations, such as high-altitude operation or when packs require maximum supply, the 14th stage provides the highest pressure bleed air. Using these three stages together gives enough range to meet pneumatic system demands across the flight envelope.