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Nutplates on Inboard Wing
Wondering how everyone dimpled the nutplates on the inboard wing, Section 16, Top Wing Skins(New Numbering, I think the old was 14). Did you dimple through all three pieces together, the top skin, the doubler and the rib, or separate out the parts and just dimple the top skin for the #8 screw. If so, how did you address the wing walk doubler? I had someone suggest to separate them, then drill an oversize hole for the dimple to sit in, in both the wing walk and the rib. Suggestions? Also, what did y'all use as .032 skin or scrap to test the fit of the mating of the two top skins? Thank you for any help you can give.
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I countersunk the inboard top skins and dimpled the bottom inboard skins. With one exception. The aft most top inboard skin hole is dimpled. |
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Countersinking for Nutplates
O.K., it doesn't say specifically to CS the other holes in step #4, but I guess because it calls out that one nutplate to dimple, the "assumption" is to CS the others. Thanks.
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If I am understanding what you are asking, you do not dimple any of those parts. The 4 inboard ribs (top), the doublers, and the skins are not dimpled at all, including where the nutplates are. You countersink the top skin only in those locations. The only dimple there should be is at the very trailing edge of the top skin and that is the center hole for the last nutplate. See where I have circled in this pic, that is the only hole that is dimpled. :) ![]() |
Looked ahead
and dimpled everything prior to assembly. The nut plates are secured to the rib only.
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So you are CS the holes for the #8 screw and all of the rivets for the nutplates (different sizes of course), except the one at the bottom and that one is getting dimpled. So CS the parts in place, then separate, debur & prime. Correct?
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A Van's Aircraft design standard is that nutplate attach rivets never get buried (making them difficult to replace if needed). |
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Machine countersink deep enough for a #8 screw dimple. |
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