What was found
CENTER WING BOX LT FR 49 HAS OXIDATION AT UPPER SURFACE BETWEEN STR 27-28. BELOW SEAT TRACK 6L DEFECT MEASURES 8 SQ INCHED IN THE CORNER. CLEANED UPPER SURFACE OF CWT BOX FR 49 STR 27-28 AT ST 6L IAW SRM 51-74-10. R & R FASTENER IAW SRM 51-40-21. REMOVED AND REINSTALLED FITTING SRM 51-72-10 ROTO PROBE OF FASTENER HOLES SHOWS NO CRACKS OR CORROSION IAW NTM 51-10-08 LIMITS ARE 006 AND 008 ORIGINAL MAT .157 AFTER REMOVAL 150 THE OTHER AREA ORIGINAL MAT .102 AFTER .096 MATERIAL LOSS IS WITHIN LIMITS IAW DWG A53811705.