Which valve closes the 5th and 10th stage of bleed air?

Which valve closes the 5th and 10th stage of bleed air?

• A. Pilot air control valve
• B. Bleed air shutoff valve
• C. Engine bleed valve
• D. Main fuel valve

Answer: (A)

Bleed air is taken from specific compressor stages and routed to pneumatic systems, with valves that isolate or regulate which stages feed the system. The valve that closes the 5th and 10th stage bleed air is the pilot air control valve. It acts as the gate for the pilot air portion of the system, so when commanded it shuts off the lines from those stages, isolating that bleed air supply. This selective closure is important to control pressures and prevent bleed air from reaching the systems when not needed. The other valves either shut off all bleed air, regulate overall bleed flow, or aren’t directly responsible for isolating those particular stages, and thus aren’t the best fit for this function.

Bleed air is taken from specific compressor stages and routed to pneumatic systems, with valves that isolate or regulate which stages feed the system. The valve that closes the 5th and 10th stage bleed air is the pilot air control valve. It acts as the gate for the pilot air portion of the system, so when commanded it shuts off the lines from those stages, isolating that bleed air supply. This selective closure is important to control pressures and prevent bleed air from reaching the systems when not needed. The other valves either shut off all bleed air, regulate overall bleed flow, or aren’t directly responsible for isolating those particular stages, and thus aren’t the best fit for this function.