What was found
DISCREPANCY: WHILE AT C-CHECK AT COMMERCIAL JET IN KDHN THE AREA OF THE AFT FUSELAGE STATION 1401 AND LONG 1L, THE REPAIR DOUBLER AND SKIN ON THE FUSELAGE CROWN AREA WAS FOUND CRACKED CORRECTIVE ACTION: COMMERCIAL JET IN KDHN, REMOVED EXISTING DOUBLER, PERFORMED NDT OF CRACK IN THE SKIN AND DETERMINED IT TO BE 4.9”. AEI ENGINEERING ISSUED EO 17404. THEY TRIMMED OUT CRACK AREA AND PERFORMED A HFEC OF THE AREA AND FOUND NO CRACK INDICATIONS. THEY FABRICATED A FILLER FROM 2024T3 .050, AN INTERNAL DOUBLER FROM 7075 T6 032”, AN EXTERNAL DOUBLER FROM 6AL-4V .032” ANNEALED TITANIUM AND 2 TAPERED SHIMS FROM 2024 T3 .032” IAW EO17404. THEY TREATED, PRIMED AND INSTALLED ALL REPAIR PARTS IAW EO17404.REPAIR APPROVAL FROM RICARDO FERNANDEZ DERT-834363-CE