Re: 747 wing stress test: This can't be true can it?

Date:         09 Apr 97 03:09:26 
From:         "J. Heilig" <>
Organization: Precision Scale Graphics
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Hans Jakobsson wrote:
> I just received a question regarding stress tests on 747s.
> Quote:
> "Is it true that a 747's wings were pulled upwards until both
> wing tips touched. (In some sort of stress test)."
> End of quote.
> I know that they do all sorts of stress tests but this can hardly be true,
> can it? My reference archives don't mention this at all. Sure, the wings
> can withstand some stress but this is a bit too heavy, I think.
> Could any testing experts please comment on this?

	I'm not an expert, but no, it's not true.  I've seen the film of the
ultimate load testing on the original 747 wing, and it was far from
touching wingtips when the spar broke.  It *was* flexed beyond belief,
but it most certainly wasn't a candidate for aircraft carrier stowage.