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What causes skin cracks?

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Bluerooster

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I've found some cracks in the wing skins on my Cherokee. Two were found 6 or 7 years ago, and repaired. As I was getting it ready for annual inspection yesterday, I noticed two more. The first two were found at the Butt rib on the left wing, and at a point about 10" forward of, the rib about middle of, the aileron on the right wing. The two recent cracks are located at the first rib out, and about 10"-12" forward of the flap, on each wing. Centered at a rivet.
 

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