M/C counter sink 7 holes x 2 on fwd center section blkhd asy to fit double flush rivets under landing gear brackets. Retorque al bolts taken out to rivet bottom skin aft ctr section blkhd assembly. Torque 4 bolts that attach fwd fuselage center section bulkhead asy to fueslage ribs. Rivet blkheads and skins and system brackets and fuselage ribs.
