What was found
DURING OP 16 MAINT CHECK, THE RT WING I/B FLAP HINGE CASTING AREA XRS 164, I/B LOWER HOLE IN REAR SPAR HAD 2 CRACKS APPROXIMATELY 1.25 AND .5 INCH LONG. CRACKS WERE STOP DRILLED AND NDT CHECKED FOR CRACK CONTAINMENT. DOUBLERS WERE INSTALLED PER DOUGLAS DRAWING JO 60271.