3 crossbleed valves on A380
Hello,
I don't understand why we need 3 crossbleed valves on the A380. Let's say we have a bleed leak on engine 1. The onside (left) and the center crossbleed valves closes and the right crossbleed valve opens. This interconnects bleed system 3 and 4. Why does it do that?
Or another example: We get bleed leak on one of the inner engines. For example engine 3. In this case the left and center crossbleed valve opens the right one stays closed and bleed system 1,2,4 are getting interconnected.
Again, I don't understand the logic behind this switching.
Can anyone help? Much appreciated.
Thank you very much!