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Daniels Web Site
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Date: 4-23-2012
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Number of Hours: 3.50
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Manual Reference: 6-3 & 4
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Brief Description: HS Rear Spar
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Clecoed the entire rear spar assembly, put painter's taped over the over the internal rib attachement points, as to not accidently set rivets in those areas. I really struggled here with the rivet call-outs by Van's in the plans. The tolerances after setting a rivet seemed a bit off. Honestly, here I should have really relied on my countless “supervised" hours working on planes in college. I actually pulled out the A&P reference after consulting a few folks & getting feedback on VAF. It seemed everyone was right in their opinion to some degree. Here is what my issue was, after setting the rivets in the spar / spar doublers, I really didn't like the height of the shop head (to short). I was relying on the “gage" supplied with my tool kit. I knew the gage was set at the mid-point of A-P tolerances, even my “pre-set" length gage I have is set at a generous “mid-point". Rivet shop heads become hardened when squeezed or bucked, hence you have a greater tolerance on the shorter side of the spectrum (but be cautious, they do become brittle when over driven / squeezed)... When looking at -4 rivets and up (-5,-6), (as long as there is a proper diameter on the shop head), this tolerance seems huge, at least to me, your good to go. Double check yourself if in question, slow down, consult the good ole' A&P book. I pulled out the book, micrometer and a magnifying glass to make sure there were no cracks on the outer edge of the shop head(s) & I was good to go. Yep, checked every single rivet & the height too, seemed short compared to the gage, but I was good to go there also. Some might not pay much attention and just rock on without a second taught to the plans. I did NOT like the rivet call outs for the outer hinge brackets (413 to spar) (4-5) at all. In my opinion they are way too long. I set them anyway to see what I come up with.
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After riveting rear HS spar
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Shop heads OKAY per specs
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Torqued to 23 inch/lbs.
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