W17 Root Rib Installation Forward Root Rib Left Hand Wing - I up drilled all holes to #30 size. I deburred the parts and then riveted them together per the plans. I re installed the root ribs and attach angles in the wing box. W07 Wing Box - Left Hamd Wing - I then drilled #40 pilot holes into the forward root rib from the holes in the leading edge skin. I located and drilled #40 pilot holes through the flap hinge. I then up drilled (to #30 size) all the holes on the lower aft skin at the rear spar.

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