What is the distribution of flapper valves in the wing tanks?

The distribution of flapper valves in the wing tanks is intended to manage fuel flow efficiently during flight by allowing fuel to move between different compartments of the wing fuel system. The choice indicating that there are six flapper valves in the structural sections and three in the outboard wall of the feed tank aligns with the design of these tanks, maximizing fuel management under varying attitudes of the aircraft.

This configuration ensures that adequate fuel can be accessed from the feed tank while also maintaining the structural integrity of the wing. The presence of flapper valves in both structural sections and the feed tank is crucial since they allow for the release and movement of fuel, which is vital for balance and performance, especially during maneuvers that may affect fuel distribution.

Other distribution options do not reflect the actual design as laid out in the aircraft systems. Thus, recognizing the appropriate placement and number of flapper valves is essential for understanding the aircraft's fuel management system and ensuring optimal aircraft performance.