What was found
DURING CURRENT C-CHECK AT SIAEC, FOUND NR 3 ENGINE LEFT FAN COWL DELAMINTED APPROXIMATELY 8 INCHES BY 8 INCHES IN GENERAL REWORK AREA NOTED BY SB 78-2150 DURING TRAS LOCK MODIFICATION. THE OUTER DELAMINTED SKIN AND FILLER WERE STAGGER CUT TO REMOVE DELAMINATED AREA. PERFORMED HFEC OF SKIN CUT EDGES. NO CRACKING DETECTED. FABRICATED REPLACEMENT STAGGERED FILLER AND TWO ADDITIONAL STAGGERED REPAIR DOUBLERS WITH A 3 INCH AND 1.5 INCH OVERLAP. A STRUCTURAL HOT BOND METHOD WAS USED TO INSTALL REPAIR DOUBLERS AND FILLERS IAW SRM 51-40-06 PAR 3K. PART NUMBER BECAME 673U0032-39 AFTER MODIFICATION FROM 65B91241-38. (M)