What was found
(CAN) WHILE ACCOMPLISHING AN INSPECTION 2 CRACKS WERE NOTED EMANATING FROM A FASTENER HOLE IN THE VERTICAL STAB SKIN. THE CRACKS WERE 5/16 INCH AND 3/16 INCH IN LENGTH. THE CRACKS WERE LOCATED AT WL 25.1, 4 FASTENERS ABOVE THE SB 218 KIT DOUBLER (REF AD95-13-02 WHICH WAS PREVIOUSLY INSTALLED. THE AIRCRAFT WILL BE REPAIRED PRIOR TO BEING RETURNED TO SERVICE. THE OTHER 690A'S IN THE FLEET WERE INSPECTED WITH NO DEFECTS NOTED.