When are fuel levels in each wing balanced by gravity?

When are fuel levels in each wing balanced by gravity?

• A. With a failure of the auto xflow function
• B. During normal operation
• C. Only during takeoff
• D. When wing tanks are full

Answer: (A)

Gravity balances the wings’ fuel levels only if the automatic crossflow system isn’t functioning. Normally, the crossfeed valve actively moves fuel between wings to keep the left and right tanks at similar levels. When that automatic crossflow function fails, there’s no pump-driven balancing, so fuel redistributes under gravity’s influence, letting levels even out as fuel settles toward the lower wing. The other situations describe normal operation or unrelated conditions, which don’t rely on gravity to balance the wings.

Gravity balances the wings’ fuel levels only if the automatic crossflow system isn’t functioning. Normally, the crossfeed valve actively moves fuel between wings to keep the left and right tanks at similar levels. When that automatic crossflow function fails, there’s no pump-driven balancing, so fuel redistributes under gravity’s influence, letting levels even out as fuel settles toward the lower wing. The other situations describe normal operation or unrelated conditions, which don’t rely on gravity to balance the wings.