From time to time you see reports about various airliners being offered with an incrreased ZFW, as part of a package of improvements to its performance. Does the discussion here suggest that:
a) they test a new wing to destruction to satisfy the 150% rule, or
b) the original wing was tested to a higher level (say 160%), and so the new ZFW still falls within range?
Apologies if I am merely demonstrating that a little knowledge is a dangerous thing, but it's been bugging me!