Which refueling method fills the wing tanks simultaneously?

The method that fills the wing tanks simultaneously is single point pressure refueling. This system employs a single refueling point, typically located on the aircraft, where fuel is pumped into the fuel tanks under pressure, allowing for efficient and rapid refueling of the aircraft's fuel system. With this approach, both wing tanks can be filled at the same time, which helps to minimize the time required on the ground and allows for a more streamlined and coordinated refueling operation.

Other methods, such as over-the-wing refueling, generally involve filling each tank independently from the top, which may take more time and does not allow for simultaneous filling. Gravity refueling relies on the natural flow of fuel by gravity, often requiring the aircraft to be positioned at a specific angle, which doesn't guarantee simultaneous filling of the wings. Sequential refueling would fill one tank at a time rather than both simultaneously. Therefore, single point pressure refueling is the most efficient choice when the goal is to fill wing tanks concurrently.