Preped the aft wing spar two AN426-3 rivets that needed dimpling. I had to fix my compressor first. Changed the check valve and I'm back up and running. Dimpled the two holes and added extra material to the F815 to F804 junction by riveting a 3/4 " .025 strip to the F815 and the flange of the F804. this will strengthen this joint as the #4 rivets are to close to the edge of the skin.
