Returned from RV-10 Transiftion training and some time off last week. Back at it today. I installed the Dsub connector on the Pitch servo cable and cut it to length and secured it to the sub-panel. then tackled the Fuel filter access panel. Began by cutting a piece of .090" 7" x 12" to serve as the doubler. After filing and smoothing the edges, I marked a 1" boundary around the piece and then trimmed out the inside. Used the high speed cut-off disc and then finished up with various files. Installed 10 #8 nutplates around the perimeter, I countersunk the #27 holes to receive the dimples from the access panel. I match drilled the #8 holes to a piece of .032" that I had cut to be 1/2 " less than the doubler. I drilled #40 holes in the perimeter of the doubler for rivets. I held the doubler to the inside of the tunnel and match drilled #40 the doubler to the tunnel rib, clecoing as I went. I removed the doubler and moved it to the outside of the rib and reclecoed, then used a fine point sharpie to mark the inside for cutout and removal. I used an air grinder with a cut off disc, and cut out the opening in the rib about 5/16" larger than the opening I had marked. reclecoed the doubler in place (on the inside) and then temp screwed the dimpled and primed access panel on the outside of the rib. Used a sharpie to mark the final perimeter of the access panel and trimed accordingly after removing doubler and panel. primed everything, countersunk the doubler, dimpled the rib and riveted the doubler to the rib, then attached the access panel using #8 screws
