Maybe not, but its brothers and sisters seem to have a history or serious cracks, and maybe this one has not been as carefully checked as others.....who knows
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Will have to see what the ATSB find, either way it seems the extra weight is not the only factor, and all it may do is accelerate the cracking.
I do think the earlier comment about if the manufacturer felt it was capable of it and they would have tested and had it certified, they would have done so and sold more aircraft as a result, was quite relevant.
J