What was found
DURING SCHEDULED INSPECTION AT AERO CORP IN LAKE CITY, FL FOUND THE AFT CARGO THRESHOLD WEB CRACKED 1 INCH DEFORMED AND HAS IMPROPER FASTENER INSTALLATION. REMOVED CRACKED INTERCOSTAL. FABRICATED NEW INTERCOSTAL FROM 7075-0 .050 7 INCH BY 3 INCH IAW DC-9 SRM 51-10-2. HEAT TREATED INTERCOSTAL IAW DC-9 SRM 51-10-2 TO 7075-T-6. TREATED AND PRIMED INTERCOSTAL IAW DC-9 SRM 51-10-3 INSTALLED INTERCOSTAL IAW DC-9 SRM 51-30-2 AND 51-30-3. INSTALLED NEW WEB PART NR 5910158-91 IAW DC-9 SRM 51-30-2 AND 51-30-3. (M)