I squeezed all of the rivets attaching the ribs to the rear spars tonight. Pay careful attention to the rivet callouts because there are a number of holes that must be skipped and there are four different lengths of AN470 rivets used. Here are a couple of holes that must be skipped where the flap brace rivets to the rear spar.
The outboard ribs attach to the rear spar with AN426 (flush) rivets since the outboard aileron brackets sits on top of this spot and rivets through the 5 open holes just inboard of these rivets.
