In the fuel XFeed system, what does the ON position do?

In the fuel crossfeed system, selecting the ON position typically allows each engine to draw fuel from its respective tank. This option is designed to ensure that each engine operates with the fuel supply from the tank located on the same side of the aircraft. By doing so, it maintains the intended fuel flow and ensures the engines can effectively utilize the fuel according to their design.

When each engine feeds from its own tank, this enhances the efficiency and performance of the fuel delivery system, leading to balanced fuel consumption and weight distribution throughout the flight. It also minimizes the risk associated with relying on a single source of fuel, which is important for safe operation.

In contrast, other options suggest behaviors that would either complicate fuel management or could introduce risks, such as drawing fuel from opposite tanks or shutting off fuel entirely, which would not support the operation of the engines. This understanding is crucial for pilots during flight operations and in managing fuel systems effectively.