After considering alternatives, Dad and I decided to comply with Van’s recent Service Bulletin 14-01-31 relating to cracks in the forward spar of the horizontal stabilizer of Van’s models RV-6/6A, 7/7A and 8/8A, whether flying or under construction.
The fix involves disassembling the inside ribs and front spar reinforcements, making a few simple modifications, and adding two doubler plates to the aft web of the HS forward spar.
In the photo above, we clecoed the vertical stab in its proper place (we’ve already had it mated and drilled to the fuselage) to verify clearance from the new HS-00003 spar doubler plates. Fit was good with no modification required, but nice to check.
Not the most fun project out there, and lots of potential to do more harm than good while drilling out all those AD4 rivets, but nice to have it out of the way. This will need to be one area we inspect periodically once we’re flying. If and when Van’s redesigns the -8 horizontal stab, we might consider building a new one.