Assembling the Firewall – 2

I positioned and clecoed the stiffeners, spacers, gussets and weldments to the matching holes in the firewall. I drilled and clecoed the remaining holes, using the firewall as a guide. I then fabricated the F-601P spacers and F-601E stiffener and installed them.  I needed to round some edges of F-601J and the ends of F-601N-L&R to fit the inside radius of the aluminum angle they rested upon.  I squared F-601J-L&R with the F-601N and F-601M stiffeners.  I aligned F-601J-L/R horizontally by nesting their inboard face with the outboard face of F-601N-L/R, using the dimension given on DWG 19 for vertical alignment.  I clamped  F601J-L&R and underlying shims F-601H-1 and F-601G-1 lightly in place and aligned the pre-punched holes. I then tightened the clamps and back-drilled F-601J through the firewall.

Time: 3 hours