Which valve controls bleed air stages 5 and 10?

Which valve controls bleed air stages 5 and 10?

• A. Bleed valve 5 and 10
• B. Engine bleed valve
• C. Main air control
• D. Pilot air control valve

Answer: (D)

Bleed air from multiple compressor stages is managed by a control valve that uses a pneumatic signal to position the bleed valves. The valve that handles the control signal from the engine’s control system is the pilot air control valve. It takes the command (via pilot air pressure) and shifts to open or close the bleed passages for stages 5 and 10. In other words, the pilot air control valve acts as the actuator that actually moves the stage bleed valves to regulate how much bleed air is taken from those stages. The main air control sets overall engine operation, but it does not directly move the stage bleed valves. The engine bleed valve refers to the valve that isolates or passes bleed air, not the device that positions the bleed valves in response to control signals. So the component that specifically controls the bleed for stages 5 and 10 is the pilot air control valve.

Bleed air from multiple compressor stages is managed by a control valve that uses a pneumatic signal to position the bleed valves. The valve that handles the control signal from the engine’s control system is the pilot air control valve. It takes the command (via pilot air pressure) and shifts to open or close the bleed passages for stages 5 and 10. In other words, the pilot air control valve acts as the actuator that actually moves the stage bleed valves to regulate how much bleed air is taken from those stages.

The main air control sets overall engine operation, but it does not directly move the stage bleed valves. The engine bleed valve refers to the valve that isolates or passes bleed air, not the device that positions the bleed valves in response to control signals. So the component that specifically controls the bleed for stages 5 and 10 is the pilot air control valve.