Marked hole locations in wing ribs. Pilot drilled holes, then drilled holes to 1/4". 1/4" holes are for the fly cutter, the tooling bolts, and to get the corner radii at each end of the flanges. That's a lot of holes. There are something like 16 aft ribs and 10 forward ribs in work, plus 6 fuselage turtle deck formers with lightening holes and corner radius holes.
