Date: 09 Apr 97 03:09:27 From: email@example.com (Kim Hackett) Organization: Your Organization References: 1
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>I just received a question regarding stress tests on 747s. > >"Is it true that a 747's wings were pulled upwards until both >wing tips touched. (In some sort of stress test)." >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. No, the wings are not static tested until the tips touched. I do not know the deflection on the 747 static tests. The B-52 wing tip deflections were on the order of 30 some feet of total deflection if I remember correctly. We recently static tested the wing of the Citation Excel at Cessna and the deflection at maximum ultimate load was 32 inches.