Prime
11/14/2021 – 0.6 hours
[Grey Scotchbrite Pads, Bon-Ami Cleanser, Dupli-Color Degreaser, Dupli-Color Self-Etching Automotive Primer (Green – Rattle Can)]

Assemble
11/12/2021 – 1.1 hours
11/14/2021 – 1.3 hours
The inboard end of each spar has 5 spar doubler rivets and 3 nutplates that are installed in this step. I started with the AN470 (round head) rivets that finish attaching the spar doubler to the spar web. I had easy access to these rivets with the squeezer.

My next task was to install the three fuel tank nutplates on the aft side of the spar webs. I couldn't reach those with the squeezer, so I shimmed up the spar to back rivet them. There is a small snap bushing that is installed in the previous step that interfered with the back-rivet plate, so I carefully popped it out and set it aside until the riveting was complete. Back-riveting worked well in this area, and the nutplates are firmly attached.

The final assembly task in the main spar assembly is to attach the aileron bellcrank brackets to the aft side of each spar. The bottom bracket on the right spar is different than the other brackets, so you have to pay attention to ensure you put that bracket in the right spot. The spars come with the bolts for the aileron bellcranks already attached to the wing tie-down brackets. I reinstalled the bolts with the bellcrank brackets attached, and torqued the AN3 bolts to 20-25 in-lbs per section 5 of the plans. The finished spars are back in the crate until time to attach the wing ribs in the next section.
[Pneumatic Squeezer, 1/8” Cupped Squeezer Set 3X Rivet Gun, Back-rivet Set, Small Back-rivet Plate, Torque Wrench]