Started December 28, 2011
Fabricated two stiffener angles and clamped them into place on the center section bulkhead so that they can be match drilled. I then clecoed the mid seat rail supports together, match drilled all the common holes and then final drilled #40 all nutplate rivet holes and then match drilled all the #12 holes for the AN3 bolts that attach them to the center section bulkhead.
Next the directions ask to cutout a portion of the center section bulkhead per the instructions. This was not required as the part I received already had them done by the factory. I then moved on to attaching the main gear and final drilling all the #12 holes. Also used the F-drill bushing to drill the #30 holes in the gear brackets, the then without the bushing final drilled these holes to #12. Temporarily bolted the gear mounts to make sure that the AN3 bolts will pass through all the parts with no issues. I then countersunk the the two holes on the center section bulkhead.
Then I disassembled all the parts, duburred, countersunk and primed all the parts.
Moving on to Section 25-4, I riveted the mid seat rail assemblies together and all the nutplates. Clecoed and then bolted the mid seat rail assemblies to the center section bulkhead and riveted together. The left and right center section bulkheads were now riveted to the center section spar. Installed all the snap bushings and torqued all the bolts to specs.
It is not time to do the aft center section bulkhead assembly. Basically the same procedure as the center section bulkhead so not much to say on this part. Clecoed all the parts together, match and final drilled, disassembled, deburred, prepped and primed all the parts. Once dry I riveted them together and attached them to the center section bulkhead.
The only thing added to this center section is it requires you to cut apart the two hat stiffeners and remove a portion of the bottom for access to buck the rivets on the lower flange. Did this and then riveted to the center section.
Section 25-6, Riveted the nutplates to F-1004b and d center section bulkheads. Bolted the aft seat rail supports. Inserted all the snap bushings per instructions.
I then fabricated the wear strip out of UHMW plastic, drilled the attach holes riveted in place.
Next step was to final drill #40 all the nutplate attach holes and #19 all the nutplate screw holes in the rear spar bulkhead, side channel and idler arm brackets.
Clecoed the rear spar attach bars, side channels, crotch strap lugs, gussets and idler arm brackets to the rear spar bulkhead and final drill #30 all the common holes between the parts. Remember to mark or tape over the holes that are to be left open.
Disassembled all the parts, deburred, countersunk, prepped and primed all the parts. Once they were dry I riveted the nutplates all but the ones that go on the upper flange of the rear spar bulkhead.
Riveted the rear spar attach bars, crotch strap lugs and idler arm brackets to the rear spar bulkhead along with the gusset to the bulkhead side channel. Then installed all the snap bushings.
Last part of this section is to cut apart the F-1034D gussets, cleco these gussets to hold together fuselage bulkheads. Final drilled all the #30holes common to the parts. Final drilled the nutplate attach holes and the nutplate screw holes.. Disassembled all the parts, deburred, prepped and primed all parts before riveting.
Riveted the gussets to the bulkheads and installed all snap bushings.
On to next section......
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