If the 6th stage bleed path is blocked by a one-way check valve, what is the consequence for bleed air flow?

• A. Preventing 10th stage bleed air from backing up into the N2 compressor
• B. Cause 10th stage bleed air to back up into the N2 compressor
• C. No effect
• D. Increase 6th stage bleed air temperature

Answer: (A)

Bleed air lines use one-way check valves to keep pressure moving in the correct direction and prevent reverse flow into the engine core. If the 6th stage bleed path is blocked by such a valve, it stops any reverse flow from higher-stage bleed air back toward the N2 compressor. In practical terms, this means the 10th stage bleed air cannot back up into the N2 compressor—the valve isolates the compressor from that reverse flow. The valve’s purpose is to protect the compressor and maintain proper directional flow, not to increase temperature or cause backflow.