What was found
AFT FUSELAGE LOWER LOBE BS 2240, STR 50-STR 51 LT: INTERNAL SKIN FOUND CORROSION, CORROSION TASK NR:C53-125-01. THE CORRODED INTERNAL SKIN AT AFTER FUSELAGE LOWER LOBE BS 2240, STR 50-51 LT WAS CUT OUT AND A DOUBLER WAS INSTALLED BEFORE THE REPAIR, DO A SKIN INSPECTION REFER TO SB 747-53A2489 AND SRM 53-00-01, REPAIR 1, REV 95, AFTER COATING THE CORRODED SKIN, DO A HFEC INSPECTION TO MAKE SURE NO CRACK FOUND REF TO 747 NDT PART6 51-00-00, PROCEDURE 23 AND THE DOUBLER WAS MADE FROM MATERIAL 2024T3.071, REFER TO SRM 53-00-01, REPAIR 1, TABLE III, DUE TO SRM 53-00-01, REPAIR 1, PAGE 203 NOTES CONFIRM THE REPAIR IS CATEGORY A AND NOT NECESSARY TO DO SUP INSPECTIONS. DECAL INSTALLED AND MONITORED IAW TOPP 30-10-70 AND PS 900-5-1, NR 4 REQUIRED ITEM INSPECTION COMPLETED.