What was found
IN CENTER ACCESSORY COMPARTMENT AT THE LT AND RT FUSELAGE FEED THROUGH FOR THE PNEUMATIC SUPPLY DUCTS 1-2 AND 1-3 HAVE FUSELAGE INSULATION BLANKETS SEVERELY BURNED AROUND THE DUCT. A/C FUSELAGE WAS INSTALLED WITH OLD TYPE OF INSULATION BLANKET. (P/N 3929452-2) BLANKET WAS NOT SECURED AND LAND ON TOP OF LT AND RT PNEUMATIC DUCTS LOCATED IN CAC AND CAUSED BLANKET TO BURN. CORRECTIVE ACTION: PNEUMATIC DUCTS FOR SYSTEM 1 AND 3 IN CAC INSPECTED FOR ANY KIND OF CRACK AND NO DEFECT IS NOTED. RECOVER DUCTS WITH HEAT RESISTANCE INSULATION BLANKET. OPS. AND LEAK CHECK GOOD PER CMM 20-20-01. EMP 435071, 224967, AND QA144239.