Section 25_5 Aft Bulkhead … Steps 1 to 11…….. Step 1, I clecoed the F-1004S-l/R and the F-1004R-L/R Seat Rail Supports together to create the 4 Aft Seat Rail Supports Sub-assemblies and then Final Drilled all the #30 holes in common. I then #40 drilled the nutplate attachments and #19 holes in the upper flanges of the Aft Seat Rails. Step 2, I final drilled the entire #40 nutplate attachment hole and #19 the screw holes in the Upper Flanges of the 1004B Center Section Bulkhead. Also did the same on the F-1004D-L/R Center Section Bulkheads. Step 3 Created the Hat Stiffener F-1004L as shown in Figure 2. Step 4, Clecoed all the above onto the Center Section Bulkhead F-1004B. Step 5, Final drilled all the in common #30 holes between the sub-assemblies. Step 6, Match drilled using a #12 bit where necessary between the F-1004B Center Section Bulkhead and the F-1004G and F-1004H Center Section Bars and Aft Seat Rail Support Subassemblies. Steps 7 to 11, Final drilled #30 the Center Section Upright Bars F-1004J with the Center Section Bulkhead F-1004B so that the long flush rivets can be attached later. I disassembled the Aft Center Section Bulkhead and deburred all edges and removed all the Aldine using sandpaper. The primed with DTM primer finisher. After drying I re-assembled the bulkhead assembly.
