What happens when the recirculation fuel fills a wing tank while the center tank supplies fuel to the engines?

When the recirculation fuel fills a wing tank while the center tank is supplying fuel to the engines, the correct answer accurately identifies a specific system behavior of the A320. The center tank pump is designed to operate in a manner that maintains optimal fuel distribution and usage to ensure safe operation and balance of the aircraft.

In this case, the center tank pump automatically shuts off when it detects that the wing tank is sufficiently filled—indicated by an approximate fuel quantity such as 1100 pounds being burned off from the wing tank. This prevents overfilling and ensures that fuel is drawn from the center tank efficiently without compromising the levels in the wing tanks. This automated response is critical for maintaining the aircraft's balance and ensuring that all systems function correctly.

This mechanism is a vital part of the fuel management system, as it promotes an even distribution and minimizes potential hazards associated with overfilling and fuel spills. Understanding this operational behavior is essential for effective fuel management during flight operations.