What was found
(AIRCRAFT NOT GROUNDED) (DEFECT DISCOVERED DURING AC HEAVY MX VISIT) NRC 1000-0067: REAR FUSELAGE CABIN FLOOR STRUCTURE, CORROSION FOUND ON LONGITUDINAL BEAM AT -Y160 FR69 AREA / REAR FUSELAGE CABIN FLOOR STRUCTURE, LONGITUDINAL BEAM AT -Y160 BTW FR 67-70 REPLACED AS PER SRM 51-72-11-911-002 REV.158"