What was found
AIRCRAFT 9521, WHILE IN ATL FOR C-CHECK, MAINTENANCE WAS PERFORMING INSPECTIONS PER WORKCARD 5530-01048-02 AND FAA AD 2018-10-08 ON THE VERTICAL STABILIZER LEADING EDGE AT ZFS=52.267. DURING WORKCARD ACCOMPLISHMENT, MTC REPORTED CRACK INDICATIONS AT ONE EXISTING FASTENER HOLES IN THE RH FRONT SPAR CAP LAYER FORWARD FLANGE BELOW ZFS=52.267. UPON LAYER SEPARATION, NO INDICATION WAS NOTED IN EITHER LAYER HOWEVER THE HOLE COMMON TO THE SKIN WAS NOTED TO BE ELONGATED. CORRECTIVE ACTION: THIS ER/A 589482-14 PROVIDES INSTRUCTIONS TO OVERSIZE THE HOLE IN SKIN LAYER ONLY AND ACCOMPLISH A BUSHING REPAIR PER BAC DWG SG95550001. LP 1712123