Yesterday, we set up the countersink cutter and made one countersink (of the seven) to the #19 screw holes for the nutplates on the inboard edge of the Top Skin. Today, we finished countersinking the remaining six holes. Shown below are all seven holes on the inboard edge that were countersunk. They were countersunk deep enough to accept the dimpled skin of a #8 screw. (The countersink on the far left near the Spar was previously countersunk and will ultimately be used as a fuel tank screw.....the hole on the far right is not countersunk, but dimpled).
The last step to complete the Right Wing (for this section), was to install the final 10 rivets in the Outboard Aileron Hinge Bracket Assembly. Five rivets were installed between the Assembly and the Trimmed Outboard Wing Rib (first picture) and five between the Assembly and the Rear Spar (second picture). I tried to follow the “rule of thumb” regarding the manufactured head of the rivet being placed on the thinnest material. However, I was not able to come up with suitable installation method to accomplish this. I initially tried squeezing the rivets with the pneumatic and hand squeezers. I have a 3” standard yoke and 2” Longeron yoke. Neither of the two were usable in this location. I couldn’t shoot the rivets from the “inside” of the Wing because of space issues. So, I made the command decision to install the rivets as you see below. We ended up shooting all 10 with a 3X rivet gun and bucking bar and they came out very nice.....I’m please with the results.
Now that the Right Wing is complete....we moved on to the Left Wing. We were able to install all of the rivets in the Top Inboard Wing Skin before we called this session for the night. We will start with the Top Outboard Wing Skin in the morning.....
Inboard view with the installed nutplates.....
*****249 Rivets Installed*****