Deburred left seatback attach hinge and riveted to floor. Match drilled, deburred, and riveted stiffeners to right rear floorboard, F-831PP, except for front stiffeners.. Drilled out two rivets from F-830PP and F-830BPP stiffener which were mistakenly installed where right seatback hinge will be attached. Squished dimples out with squeezer. Fit all floorboards into fuselage.
