Deburred and dimpled F-866A forward baggage bulkhead. Deburred, dimpled and countersunk forward side skin holes of firewall. Countersunk inboard #30 holes of L & R F-817 seat back support plates. Countersunk #40 holes of fL& R F-804H center section side plates. Countersunk #30 and #19 holes of L & R F-856-1 spacers. Countersunk #19 screw holes in L & R F-843 lower longerons. Countersunk #19 holes in top web of F-844-L auxiliary longeron common with F-883-1 fuel valve bracket. Contersunk #19 holes in L & R F-802D landing gear box plates for screws. Contersunk #30 rivet hole on top side of L & R F-814C inboard seat rib angle. Contersunk #30 holes on forward tab of L & R F-889 aft lower longerons. Contersunk all #40 holes in L upper longeron F-887.
