What was found
DURING HEAVY MAINTENANCE: FUSELAGE / REAR FUSELAGE / BUTTSTRAP / @ LEVEL OF FR64 BTWN STR 42L-44L / CORROSION - PERMANENT REPAIR; REFERENCES: /1/ AEROMAN EA 53-0022-25 REV. 0 (COVER + PART 1) /2/ AIRBUS RDAF 81570418/004/2025 ISSUE A /3/ AIRBUS DOSSIER 81570418 /4/ AIRBUS REPAIR INSTRUCTION R534-71164 ISSUE A. DESCRIPTION: DURING THE CURRENT (04/2025) H3 CHECK AT SAL FOR A/C N763JB (MSN03707), AEM REPORTED CORROSION DAMAGE ON THE REAR FUSELAGE AT THE BUTTSTRAP LOCATED @ LEVEL OF FR64 BETWEEN STR 42L-44L. THE REWORK DIMENSIONS WERE REPORTED AS 8.224” L X 3.730” W WITH A MRT OF 0.032”. SEE REF /1/ AEROMAN EA FOR DETAILS. THE DAMAGE WAS EVALUATED AGAINST THE SRM AND NO ALLOWABLES/REPAIRS WERE FOUND. HENCE, AIRBUS WAS CONTACTED FOR REPAIR INSTRUCTIONS FOR THIS DAMAGE. AIRBUS PROVIDED INSTRUCTIONS VIA REF /3/ DOSSIER TO CUT AND REMOVE THE AFFECTED PORTION OF THE BUTTSTRAP, INSTALL SPLICE REPAIR WITH 2 EXTERNAL DOUBLERS, PERFORM NDT INSPECTIONS AND RESTORE SURFACE PROTECTION AS PER REF /4/ RI. THESE INSTRUCTIONS ARE APPROVED BY THE REF /2/ RDAF AS PERMANENT WITH NO POST REPAIR INSPECTIONS REQUIRED. EC A25-387-01 ACCOMPLISHES THE PERMANENT REPAIR PER THE REF /1/ EA AND COMPLIES WITH THE REF /2/ RDAF WITHOUT DEVIATION. SUBSTANTIATION: THIS PERMANENT, CATEGORY A, REPAIR IS APPROVED BY REF /2/ RDAF AND IS CLASSIFIED AS MAJOR. (E/C: A25-387-01)