Well Known Member
Photo: The R-606PP Reinforcement Plate clico'd between the flanges of R-902 Rudder Spar, and with the R-405PD Rudder Horn behind them. Notice the two undrilled holes in the Spar. Those two holes were factory drilled.
Photo: Same three parts shown from the Rudder Horn side. Note again two factory drilled holes in the Rudder Horn are undrilled in the Spar.
My natural assumption would be that these holes should be match drilled in the Spar to either the Reinforcement Plate or the Rudder Horn before riveting. However:
1) These two holes do not appear anywhere that we could find on Rudder DWG 7, Revision 5. Drawings of the three aforementioned parts and the builder fabricated R-917 Shim that fits between the Spar and Rudder Horn do not show these two holes.
2) The written instructions for Rudder construction do nowhere mention the two holes. The three clico'd holes next to them are specificalled out for match drilling to the spar.
With the holes not shown on the drawings and not mentioned in the instructions, while three holes next to them are, I became confused and telephonedf Vans for clarification. I was told the two holes are "most likely tooling holes" and not to drill them.
Is this a potential gotcha? What did you do?