Riveted the bulkheads and nutplates to the forward center section subassembly.
Riveted the nutplates, seat ramp supports, aft floor support angles, aft bulkheads and center section vertical bars to the aft center section subassembly.
Fabricated aluminum spacer blocks 1.438" thick and joined the forward and aft center section subassemblies with the 1/4" NAS bolts.
Match drilled, machine countersunk, disassembled and deburred the holes in the center section top plate as per instructions.
Riveted the nutplates to the center section top plate.
Reassembled the forward and aft center section subassemblies as well as the forward control mount, seat belt attach lugs and spacer tubes.
Riveted the nutplates and 1/8" rivets to the forward flange.(except where the mid cabin braces attach)
