Many modern passenger jets can flex their wings nearly 90 degrees in a test 
Airbus, for example, performed the ultimate load test on a specially built 
static airframe of its A350 XWB Airbus in December 2013. The plane’s wings 
received loads of up to 1.5 times higher than they would ever encounter in 
service. And at ultimate load, the plane’s wingtip deflection exceeded five 
metres – that means the load bent the wing up almost 90 degrees...snip

G: This seems impossible in practice considering that the wings contain fuel 
tanks, piping, structural components, etc.


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