What was found
FWD CARGO PIT, FRAME EXTENSION AT BS 520 IS CRACKED IN UPPER RADIUS, ABOVE STRINGER 22L ON FWD SIDE OF FRAME, MARKED END OF CRACK WITH BLACK DOT, (CIRCLED) GENERATED FROM U/C 53F0020. REMOVED CRACKED FRAME EXTENSION. VERIFIED MATERIAL FOR FABRICATION OF NEW FRAME EXTENSION, 7075-O .063" A61578 PO NR 1026198. HEAT TREATED NEW FRAME EXTENSION PART NR 53FX1350-1 TO T-6 CONDITION. TREATED AND PRIMED AND INSTALLED NEW FRAME EXTENSION REF SRM 51-30-2, 51-10-2, AND STC DWG 53FX1350. THIS IS CLASSIFIED AS A MAJOR REPAIR.