What was found
DURING WALK AROUND, FOUND WHAT APPEARS TO BE 1/2 CRACK & PUNCTURE IN FUSELAGE, LOCATED ABOUT 8 FEET AFT OF AFT LOWER CARGO DOOR. CRACK & PUNCTURE IS PROTRUDING OUTWARD. REMOVED CORROSION DAMAGE IAW SRM 53-20-00. REQUIRES HFEC OF CUT OUT AREA TO INSURE ALL DAMAGE IS REMOVED IAW SRM 53-20-00. PERFORMED HFEC OF REMOVED DAMAGE AREA IAW NTSPM 06-10-01 001 PROCEDURE 1 NO ADDITIONAL DEFECTS NOTED. INSTALLED REPAIR DOUBLER & TRIPLER IAW SRM 53-20-00 REF EA 8-5330-T0323644 & ERS 16-01113. ACFT RETURNED TO SERVICE IAW EA 8-5330-T0323644 P1.