How is fuel crossfeed used to balance tanks?

• A. Fuel is transferred between left and right wing tanks to equalize levels and maintain CG within limits when imbalances occur or a tank is depleted
• B. Crossfeed is not used on A321
• C. Crossfeed transfers fuel from wings to center only
• D. Crossfeed is used to mix fuel types

Answer: (A)

Fuel crossfeed lets fuel move between the left and right wing tanks. Its main purpose is to keep the fuel distribution balanced so the aircraft’s center of gravity stays within approved limits. In flight, fuel burn isn’t always even, and one wing can end up heavier or a tank can become depleted. By opening the crossfeed, fuel can be transferred from the fuller wing to the lighter wing, evening out the levels. This helps maintain safe handling and ensures the engines can keep receiving fuel even if one side’s tank is low or its pump isn’t supplying as expected.