What was found
MCN - MAJOR REPAIR - DURING C-17 CHECK CORROSION WAS FOUND ON UPPER SURFACE OF FLOOR SUPPORT BS 993.5, LBL 33.80. MAINTENANCE REMOVED CORROSION AND FOUND MATERIAL LOSS TO BE OUT OF LIMITS; REMOVED CORRODED FLOOR SUPPORT FROM BS 986.5 TO BS 1006, LBL 33.80; FABRICATED A NEW REPLACEMENT FLOOR SUPPORT IAW DWG 65C32074; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, PARA. 7.D.6.