I match drilled the left wing ribs to the spar and drilled the systems holes for the wiring runs.
The instructions in section 14 have you dimple only the lower flange of the ribs, but I know that the upper skins also have flush rivets. I read ahead and discovered that the inboard 4 ribs do not get dimpled because the wing walk doublers and wing skin get counter sunk. However, the remaining ribs do get dimpled. I went ahead and dimpled the upper flange for all but the inner 4 ribs for both the left and right wing now, rather than wait until chapter 16. It is easier to dimple before the ribs are riveted to the spar.
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