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View Diary: How Airliners Work - Wings and Stuff (67 comments)

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  •  Wing spar failure due to metal fatigue. (7+ / 0-)

    From the NTSB accident investigation:

    Subsequent metallurgical examination of the right wing disclosed evidence of multiple fatigue cracks in the right wing�s lower surface skin panels, with origins beneath the forward doubler at Center Wing Station (CWS) 53R at the stringers 16 and 17 location. The origin points were determined to be in rivet holes, which join the external doubler and the internal stringers to the lower skin panel. These cracks, which grew together to about a 12-inch length, were found to have propagated past the area where they would have been covered by the doubler and into the stringers beneath the doubler and across the lap joint between the middle skin panel and the forward skin panel.
    Here is the complete NTSB accident summary at the link.

    The general who wins the battle makes many calculations in his temple before the battle is fought. The general who loses makes but few calculations beforehand. - Sun Tzu

    by Otteray Scribe on Wed Apr 03, 2013 at 12:01:48 PM PDT

    [ Parent ]

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