What was found
DURING WEEKLY CHECK, FOUND DELAMINATION ON NR 1 ENGINE RT T/R (FAN COWL DUCT) INNER SKIN (DAMAGE MEASUREMENT IS 34 BY 13.5 INCH), CAUSED BY LIBERATION OF 2 OUTLET VANES ON IDG AIR/OIL COOLER ASSY P/N 35E38-5. FAN REVERSER P/N 683L136G08 WAS REMOVED AND TEMPORARY REPAIR WAS PERFORMED BY FAA RS UL6R925Y IAW SOPM 70-43-20. FAA FORM 337 & 8110-3 WERE ISSUED APPROVING THIS REPAIR. FAN REVERSER WAS INSTALLED IAW AMM 78-31-01 PAGE 414-423 WITH SATISFACTORY TEST. ALSO, AIR/OIL COOLER IDG ENG 1 WAS REMOVED AND REPLACED IAW AMM 24-11-04 PAGE 401-407 WITH SATISFACTORY TEST. AIRPLANE WAS RETURNED TO COMMERCIAL OPERATIONS ON JANUARY 24, 2006.