Dimpled and countersunk F-823-1 R mid side skin. Dimpled L & R F-815A forward outboard seat ribs and F-815B aft outboard seat ribs. Dimpled and countersunk forward and aft edges of seat rib assembly skins F-826-1 and F-827-1. Deburred L & R F-848-1 upper gussets. Removed F-820-L-1 forward side skin and reclecoed substructure parts back in place. Clampled F-883-1 fuel valve bracket in position. Marked and drilled to #19 holes attaching fuel valve bracket to F-844-L auxiliary longeron.
