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Old 12-28-2022, 09:02 AM
Bogdan Bogdan is offline
Join Date: May 2018
Location: Essex
Posts: 10
Default RV12iS wing spars offset holes

Hi everyone, it's a question with is stuck to my mind for a long time. I built my RV12iS wings while ago, I'm in the process of finishing kit but: when I received my wings kit, both spars had some problems. First, missaligned rivet holes in the wing spar and spar stub - offset holes, then a rib angle riveted upside down by the factory. The solution by Vans was to: Misaligned .129 rivet holes in spar and spar stub (both left and right spars);
Drill through the thicker stub spar into the thinner spar channel from the front side of the spar stub where possible.
Since the mismatch appears to vary in extent here are several options:
For hole diameter .129 - .136; use LP4-3
For hole diameter .159 - .164; drill or ream #21 or #20 (.159-.161), for CR3213-5-4 UNIVERSAL HEAD rivet. (5/32 nominal diameter)
For hole diameter .176 - .180; drill or ream #16 for CR3243-5-4 UNIVERSAL HEAD / OVERSIZE DIAMETER rivet. (1/64” over the 5/32 nominal diameter)
Then to drill out that angle, fill the existing holes and drill new ones and rivet a new angle back.

Question is, how safe should I fell now with my wings if the initial fabrication process was wrong somehow. They said is not a structural concern but in my head is always a concern. Could those holes drilled again cause any cracks or structural concerns? Please share your experience, much appreciated. Thank you

Last edited by Bogdan : 12-28-2022 at 11:11 AM.
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Old 12-28-2022, 02:31 PM
thiggins thiggins is offline
Join Date: Mar 2020
Location: Saluda,NC
Posts: 213
Default I would only go with the engineering

I would only go with the engineering Department’s advice from Vans Aircraft, no one else. Opinions won’t run the math.
Donation 2023 paid
ASEL INST COMM Tail-wheeler
RV-12iS builder (Empennage complete, Wings complete!, Fuselage well under way!, finish kit under way!, Garmin avionics ordered, engine ordered, shop out of order )
Got a hangar, and moved some large pieces in!
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