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Barry's RV14A
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Date: 11-8-2023
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Number of Hours: 1.80
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Manual Reference:
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Brief Description: Wing Spar's Doubler Mis-Alignment....
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Section 41 - in preparation to attach the wings to the fuselage, I noticed that some of the holes in the spar's doublers do not “exactly” match-up with the spar holes. In a few cases, there is a couple thousandth offset - primarily with the 0.375 holes. Since the eight attachment holes (per wing) are classified as "close tolerance", I needed options in correcting this issue.
I reached out to Van's Builder Support & had a chat with Kevin. As always, Kevin is an outstanding advisor. He's an educator, a historian & a motivator. He never makes you feel negative about asking your question. Below is a brief of our conversation:
“The holes in a spar & the doubler are match drilled & reamed. But, when the doubler is attached to the spar, the riveting process may cause an offset in alignment with the spar holes. A possible solution is to slightly chamfer the backside of the doubler's offending hole by gently pulling the doubler away from the spar; thereby creating a relief for the bolt to slide through. Otherwise, when a bolt is installed & then contacts the offset; the doubler may tend to be pushed out as it attempts to create its own chamfer through sheer force.”
** In case you're wondering, as I was, reaming any close tolerance hole is NOT recommended by Vans Aircraft.
Additionally, reshaped & cut 9mm (0.357) brass rod to fabricate 2ea. drift pins to ease wing attachment
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