What was found
CORROSION ON INTERNAL PRODUCTION DOUBLER BTW EXTERNAL SKIN AND LOWER PAN, AT AFT CARGO COMPARTMENT LOWER DOOR JAMB. SUMMARY OF NRC 0285: CORROSION LEVEL 2. INTERNAL PRODUCTION DOUBLER BTW EXTERNAL SKIN AND LOWER PAN, AT AFT CARGO COMPARTMENT LOWER DOOR JAMB WAS REPAIRED PER ERA 611792-14 REV ORIGINAL SECTION I: PERMANENT REPAIR. REPAIR APPROVAL IS LIMITED TO 24 MONTHS SERVICE ONLY. ADDITIONAL ENGINEERING AUTHORIZATION (ER/A REVISION) IS REQUIRED FOR CONTINUED SERVICE BEYOND 04OCT25. NOTE TO ENGINEER: A DAMAGE TOLERANCE EVALUATION (DTE) IS REQUIRED IN ACCORDANCE WITH PROCEDURES ESTABLISHED BY FAA ADVISORY CIRCULAR 120-93. FOLLOW UP UNDER LOG 0011686. ASSOCIATED ER/A 14-611792 ADDED FOR AC 9520. (LP #0012729)