oh and did I mention the complicated fuel system on the Bus? Inner tanks, outer tanks, split tanks. The 346 has 18 fuel pump switches on the overhead panel for goodness sake!!
We had a 330 divert into Darwin with a medical problem a while ago. The crew didn't transfer the fuel from the outer tanks to the inner before landing...........so what happened? The outboard wings iced up in the humid Darwin air due to cold fuel !! 12 hour tech delay waiting for the fuel temp to rise and melt the ice.
( crew ran out of hours to continue )
the crew can't be blamed, they were not to know, they do now.