What was found
2020-08-30 UPON LANDING DURING MX WALK-AROUND NR 2 ENGINE RIGHT CORE COWL WAS NOTICED TO HAVE FAILED DURING FLIGHT, PI-REP ENG 2 CORE COWL DAMAGED AND PIECES MISSING. CONCLUSIVE FAILURE IS UNDETERMINED, TWO POSSIBILITIES WHICH COULD RESULT IN SUCH FAILURE ARE: 1-FIT AND FAIR RESULTING IN EXCESSIVE AIR LOAD UNDER THE COWLING DURING FLIGHT. 2-FAILURE OF FORWARD CORE COWL HINGE/HARDWARE. ULTIMATELY THE FORWARD CORE COWL HINGE BRACKET FAILURE WAS CAUSED BY EITHER OF CONDITIONS 1 AND/OR 2 ABOVE, AND WILL BE IDENTIFIED FURTHER BELOW. FLEET ACTION WILL BE AS FOLLOWS: 1-PERFORM AN INSPECTION OF ALL CORE COWLS FOR FIT AND FARE, AND PERFORM INSPECTIONS OF CORE COWL HINGES, BUSHINGS, HARDWARE AND ATTACHMENT FOR CONDITION, SECURITY, WEAR. 2-PERFORM AT NEXT SCHEDULED MAINTENANCE A DETAILED INSPECTION OF HINGE, HINGE BUSHING, HARDWARE, AND ATTACHING STRUCTURE INTERNAL/EXTERNAL INCLUSIVE OF FIT AND FAIR OF ALL ENGINE CORE COWLS. INSPECTION INTERVAL: CURRENT TASK INTERVAL FOR INSPECTION OF CORE COWL HINGES IS ACCOMPLISHED AT LOWEST LEVEL C-CHECK ON CARDS 101C-124, 224, 324. ADD THE FOLLOWING VERBIAGE TO THE DETAIL INSPECTION TASK REQUIREMENTS "INTERNAL/EXTERNAL" AND "STRUCTURE".