Rivet L inboard seat rib angle, F-805D bracket and seat belt anchor to L inboard seat rib. Rivet both aft inboard seat ribs to seat rib angles. Rivet all inboard seat ribs to rear spar bulkhead assembly. Rivet aileron trim servo support bracket to L inboard seat rib. Rivet aileron trim tube guide to R inboard rib. Rivet both F-813 aft outboard seat ribs to rear spar bulkhead assembly. Clecoed center bottom skins to seat rib assembly.
