Title: 14-03 - Flap Hinge Brackets
Initial Prep (Debur, Trim, Drill, and Cut) 12/7/2021 – 1.2 hours 12/8/2021 – 1.6 hours 12/10/2021 – 4.5 hours 12/11/2021 – 1.7 hours 12/12/2021 – 2.1 hours This step starts with straightening (as needed) the four flap hinge brackets. The brackets are made from 3/16” thick aluminum, which doesn't sound like a lot but is actually pretty thick – especially when you're trying to straighten it. Fortunately, they only needed some small adjustments. The straightened hinge brackets, hinge ribs, and #3 and #8 inboard ribs were cleco'd together and the 16 #30 holes match drilled. I turned my attention next to the left and right outboard wing ribs. The plans specify removing the aft flange (but not the aft flange radius). I marked the cut line on the flange and used the Dremel with a metal cutting wheel for the rough cut. I then filed the cut area level and finished it with the Scotch Brite wheels and hand pads. The final task for this step was to cleco the ribs to the wing spars and match drill the upper and lower attach points on the ribs that will receive bolts. It was a lot of fun to tack the wing structure together and finally get a sense of what the wings will eventually look like. The match drilling went well using the holes in the spar as a guide, followed by final drilling all the remaining rib holes common to the spar flanges and web. [Hole and Edge Deburring Tools, #30 drill, #12 Drill, Dremel with Metal Cutting Disk, Files, 6” Scotch Brite Cut and Polish Wheel, 1” Scotch Brite Cut and Polish Wheel, Electric Drill] Prime 12/12/2021 – 1.5 hours I planned to finish this step by priming the four flap hinge brackets and hing bracket ribs. It is important at this point to keep all of the parts organized so they can be installed in the same spot where they were match/final drilled. To help with the organization, I plan to prime relatively small batches of parts (8 in this case) so I can label them properly for assembly later. Unfortunately, this was one of the worst primer jobs I've done. I think a combination of cool temperatures and being out of practice were the culprits. I'll sand down the bad primer areas and try again… [Grey Scotchbrite Pads, Bon-Ami Cleanser, Dupli-Color Degreaser, Dupli-Color Self-Etching Automotive Primer (Green – Rattle Can)]


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