When does the center tank begin to feed the engines after takeoff if there is fuel in the center tank?

The correct answer aligns with the aircraft's fuel management system and operational procedures after takeoff. On the A320, the center tank begins to supply fuel to the engines once specific conditions are met. One of these critical conditions is related to the landing gear position; when the landing gear is retracted, the aircraft signals that it has successfully taken off and is in a positive climb.

This allows the fuel system to initiate feeding from the center tank, provided that there is fuel present and the fuel pumps are operational. The retraction of the slats, while crucial for aerodynamic efficiency and stall protection, does not directly relate to the fuel management process or center tank fuel feed timing. Thus, it is not the correct trigger for the center tank to begin supplying fuel.

Understanding this sequence is vital for pilots to manage fuel consumption effectively and ensure optimal engine performance during critical phases of flight.