Continued work on the Aft Fuselage. The remaining Horizontal channels wre installed and cleco'd in place. The Right and Left Seat Belt Mount Assemblies, SNX-F23-05R/L, were placed, drilled and cleco'd. The Aft Shear Web Assembly, SNX-F22-02 was placed and Clamped. The holes in the front three lower horizontal channels were drilled using the bottom skin as the guide. They were then cleco'd. The Aft Lower Mount Angle, SNX-F23-04, was placed, and the four holes through the Lowr Vertical Fin Post Assembly were drilled, Temporary bolts were installed.