How long do the transfer valves remain open?

How long do the transfer valves remain open?

• A. They close after 5 minutes.
• B. They stay open until the center tank is full.
• C. They remain open until the outer tanks are empty.
• D. They close when the center tank is refueled.

Answer: (C)

The transfer valves are there to move fuel from the outer wing tanks into the center tank so the center tank can feed the engines as needed. When you activate the transfer function, the system is designed to keep those valves open until there’s no fuel left in the outer tanks to transfer. In other words, you drain the outer tanks into the center tank, and the valves close only when the outer tanks are empty. This ensures you don’t leave usable fuel in the wings and you maximize the center-tank inventory for engine feed.

The transfer valves are there to move fuel from the outer wing tanks into the center tank so the center tank can feed the engines as needed. When you activate the transfer function, the system is designed to keep those valves open until there’s no fuel left in the outer tanks to transfer. In other words, you drain the outer tanks into the center tank, and the valves close only when the outer tanks are empty. This ensures you don’t leave usable fuel in the wings and you maximize the center-tank inventory for engine feed.