What was found
ANNUAL INSPECTION FOUND SEVERE CORROSION AT STA 65.33 BELOW FLOORBOARDS. STEEL REINFORCEMENT HAD CORRODED BADLY. SURROUNDING STRUCTURE STARTED TO CORRODE. REINFORCEMENT IS MAJOR STRUCTURE FOR LANDING GEAR BULKHEAD, PN 0710600, AND IS FASTENED WITH HI-SHEAR FASTENERS. REINFORCEMENT REPLACED WITH NEW. SURROUNDING STRUCTURE TREATED AND PRIMED. NUMEROUS STRUCTURAL PARTS HAD TO BE UNRIVETED TO AFFECT REPAIR. REPAIR WAS EXPENSIVE. SUBMITTER SUGGESTS CLOSE INSPECTION OF THIS AREA ON OLDER AIRCRAFT.