What was found
TWO CRACKS IN LT STUB WING SPAR III ,CRACK INDICATIONS AT THE 3 & 7 O`CLOCK, CRACKS START AT THE FWD SURFACE OF THE BLKHD EXTEND 0.125" INTO THE BORE WITH AN AMPLITUDE OF 100 PERCENT AND 60 PERCENT. PHASE ANGLE= 311, DEGREES L=0.300") WERE FOUND IN THE CRITICAL FASTENER HOLE ON THE LT SIDE AFTER IT HAD BEEN ENLARGED TO 8MM (.314") DIAMETER IAW THE SB170-57-0038. SINCE THE REPAIR OF A CRACKED HOLE IS NOT COVERED IN THE SB, A REPAIR WAS REQUESTED FROM MFG. THE CRACK DAMAGE WAS REMOVED BY SPOT FACING TO .625" AND INSTALLING AN OVERSIZED BUSHING IAW ETD2013-170-030355A.