What is the effect of a failure in the bi-directional crossflow pump?

The failure of the bi-directional crossflow pump significantly impacts the aircraft's fuel management system. When the bi-directional crossflow pump fails, it disrupts the normal flow of fuel between the left and right fuel tanks, which is essential for maintaining balance during flight. Without the ability to automate fuel movement across the tanks, there is a risk of one tank becoming overly full or empty, which can lead to an imbalance that must be corrected to ensure safe flight operations.

As a result, manual fuel management becomes necessary to monitor and adjust the fuel levels in each tank actively. The flight crew must take action by managing fuel transfers manually, which may involve using the fuel control valves to correct the imbalance. This requires careful attention and can increase workload for the pilots, especially during critical phases of flight.

In contrast, some other choices suggest a lack of impact or automatic procedures that are not applicable in this case—these would not accurately convey the situation resulting from a pump failure. Manual management is a crucial response that pilots must undertake to maintain optimal fuel distribution and aircraft performance.