What was found
DURING C-4 CHECK, INSPECTION REPORTED CORROSION ON FLOOR WEB OB AND AFT OF BEAM AT FR69 AND Y1292. REMOVED FLOOR WEBS IAW SRM 51-42-11. FOUND UPPER WEB TO BE OUT OF LIMITS AND LOWER WEB TO BE WITHIN LIMITS IAW SRM 53-00-14. PERFORMED PANAMETRIC ULTRASONIC THICKNESS TEST ON LOWER WEB. FOUND MAX MATERIAL LOSS TO BE WITHIN .002 AND .003 IAW NTM 51-10-04, PART 4. TREATED, PRIMED AND PAINTED LOWER WEB IAW SRM 51-75-12. RIVETED NEW SHEAR PLATE WEB TO LOWER SUPPORT ANGLE WEB IAW SRM 51-42-11. REINSTALLED SUPPORT ANGLE WEB AND INSTALLED NEW SHEAR PLATE WEB IAW SRM 51-42-11 AND DRAWING NR 18D53474180.