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Ron's Web Site
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Date: 8-16-2009
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Number of Hours: 8.50
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Manual Reference:
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Brief Description: Wing Root Ribs
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I installed the root ribs on both sides, using the aft end of the wing template, and aligning the trailing edge with the flap trailing edge, using about 1/2 inch spacing between the flap and the root skin. I ended up drilling #46 drill holes in the center of the rib flanges front and rear, clamping the root skin in place, and scribing the location of the pilot holes onto the root skin. I then drilled out indicated holes on the skin with a #40 short threaded drill (the smallest that I had) on the aft end and the forward end with a #46 drill bit. The short threaded drill bit was needed to drill from inside out at the trailing edge where the distance between the top and bottom skin was very small. Once the forward and aft holes were drilled, I used a fan drill guide to space the holes approximately 1.41 inches, which roughly mimics the interval used by Avipro on the wing. The Avipro spar flange drill line is -4 or #30, which is supposed to pick up the root skin. Unfortunately, on the bottom right side I ended up trimming on that drill line by mistake, and I fabricated a doubler to augment the skin so that forces will be transferred to the spar flange. I carried through the aft bottom wing skin stiffener rivet line onto the root rib skin on both sides. Of course, there was a lot of drilling, deburring, and dimpling.
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Aligning pilot holes.
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Bottom view, left root rib.
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Finished root ribs and boo-boo doubler.
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