What was found
DURING A MAINTENANCE VISIT FOUND CORROSION, FUSELAGE, AFT CABIN BETWEEN STA 1745 AND STA 1766 FLOOR SUPPORT CHANNEL CROSS OVER STIFFENER HAS CORROSION EXFOLIATION EMANATING FROM FASTENERS. DAMAGE EXCEEDED LIMITS IAW DC-8 SRM. REMOVED DAMAGED, TREATED AREA IAW DC-8 SRM 51-1-8. FABRICATED AND INSTALLED FLOOR SUPPORT CHANNELS AND CROSS OVER STIFFENERS FROM 7076-T6 EXTRUSIED IAW DC8 SRM 51-1-4. INSTALLED HAT CHANNELS AND STIFFENERS IAW DC8 SRM 51-1-20D IAW FAA APPROVED TENNESSEE TECHNICAL SERVICES DER ENGINEERING SKETCH NR EO-99-094 WITH APPROVED 8110-3 DATED JUNE 12, 1999.. (CORROSION DAMAGE RECORDED IN EWA CORROSION PROGRAM).