Started off this morning finishing up all the drilling tasks of the forward fuselage side skins, including match-drilling the longerons and upper/lower fuse channels. Drilling into the outboard face of the channels was pretty simple, but match-drilling the upper and lower flanges to the "three-fingered" firewall brackets proved to be a little tricky. The "fingers" on these brackets not only need to be held tight against the channel, but also need to be pulled in an outboard direction so that they nest further inside the channel, otherwise the holes you drill will just barely hit the edge of the part. I ended up using two C-clamps, one in the X-axis and one in the Y-axis to get all the flanges oriented properly before drilling. Once one or two holes were made and clecoes could be put in place, it wasn't nearly as tough.
Anyway, once all the final- and match-drilling was complete, the whole structure that had been slowly clecoed together over the last several days could now come apart for deburring, dimpling, countersinking, scuffing, and priming.
Most (but not all) of the substructure for the Fuse Side Skins
We got through deburring all of the substructure parts and ended up calling it a night. There are a lot of parts both big and small, and the deburring task takes a considerable amount of time. We'll get through it all though I'm sure... hopefully tomorrow!
