Today I got started with all the wing spar countersinking.....after the screw holes are countersunk, that will have been about 554 holes countersunk give or take a few.
So Vans has you countersink all the nutplate mounting holes flush. They also have you countersink the holes that just intersect the ribs and spare flanges flush since they don't go thru the skin.
Next they have you countersink the rest of the 3/32 holes -0.007" from flush that have rivets that come thru the skin. There are a bunch of them!
Next I spot primed all the nutplate mounting holes with self etching rattle can primer.
Finally I placed all the nutplates, ready for riveting and ran out of time!
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