What was found
C-CHECK - FUSELAGE VERTICAL WEB AT FS X783 HAS CORROSION ON BOTTOM ANGLE ALONG AFT SIDE 11" LT OF C/L THROUGH 23" LT OF C/L. REMOVED (4) FASTENERS IN BOTTOM ANGLE FOR FOM. REMOVED PITTING CORROSION ON BOTTOM ANGLE WITH SCOTCHBRITE REF SRM 51-21-00. PERFORMED HFEC OF 2 BLENDED AREAS FOR CRACKS IAW NDTM PART 6, 51-00-01. NO CRACKS NOTED. PERFORMED UT THICKNESS ON EACH BLENDED AREA IAW NDTM PART 1 51-00-04, IB HIGH .050 LOW .039/ OTBD HIGH .050, LOW .044. MAPPED FOR ENGINEERING. REINSTALLED 2 HI LITES AND 2 RIVETS IN WEB ANGLE BRACKET IAW SRM 51-40-15 AND 51-42-05. COMPLIED WITH RD 8/4-53-3269.