How is fuel in the center tank transferred to the wing tank?

Fuel in the center tank is transferred to the wing tank through a system that utilizes a transfer ejector. This process is designed to ensure that fuel is moved efficiently and automatically as the fuel levels in the wing tank decrease. Specifically, the transfer begins when the fuel quantity in the wing tank falls to a predetermined level, which is typically set at 93% capacity. At this point, the ejector uses the venturi effect, created by engine-driven pumps, to draw fuel from the center tank into the wing tank without requiring manual intervention.

This system is particularly beneficial as it minimizes pilot workload and enhances fuel management during flight. In contrast, other methods of fuel transfer, such as manual pumping, would be less efficient and could delay fuel access as they require active management by the flight crew. Gravity flow is also insufficient as it relies solely on the force of gravity, which might not effectively move fuel at all required operating conditions. Auxiliary tanks are not applicable here as they are separate from the primary fuel system that involves the center and wing tanks.