Section 14 – Wing Walk

No pictures today (because I forgot to take them) but a quick note to say that I finished countersinking the inboard top skin / wing walk doublers. This section of the skin is countersunk because there's two layers of .032 aluminum making it a little thick for dimples. The rest of the top inboard and outboard skins are dimpled and that's the next task.


Section 13 – Finishing the rear spar

Finished preparing the rear spar doubler plates and aileron brackets this weekend. These parts were then riveted to the rear spar using an assortment of AD4 rivets. The last step that remains before attaching to the wing is to ream the rear spar attachment hole to 3/8 inch. That will have to wait until the reamer I ordered from aircraft spruce comes in this week.


Section 11 Main Spar Part III

Good day’s work today going through page 11-03. I finished countersinking the left wing main spar. After countersinking all of the nut plate attach rivet holes and the skin attach rivet holes, I primed the countersunk portion of the hole by spraying primer then wiping it off of the flat part of the spar flange.

After the primer dried, it was time to install about 60 nutplates, each with 2 AN426AD rivets. The lower flange, I used the Main Squeeze hand squeezer. I had to drill out a couple of rivets, one because it didn’t set flush, and one because I wasn’t paying attention… see below…
IMG 2246

Ultimately, they all got successfully installed.
IMG 2247

IMG 2248

For the upper flange, I used the pneumatic squeezer. It’s a very powerful tool and requires a good bit of focus for me. I was pleased with the results, I had to drill out two rivets that didn’t set flush but it went much faster and less muscle power.

Here’s a video of me installing nutplates, first with the hand squeezer then with the pneumatic. Then I countersink the attach screw holes deep enough to allow the dimpled 0.032 wing skin and fuel tank.