What was found
MID CABIN MAIN FLOOR STRUCTURE STA 856 TO 861, RBL 46 , WL 208, SEAT TRACK I/B FLANGE CORRODED ON UPPER SURFACE. REMOVED CORROSION, FOUND TO BE OUT OF LIMITS, ORG THICKNESS .100". REMOVED THICKNESS .073", LOSS OF 27 PERCENT, REF SRM 53-10-01 FIG. REMOVED AND FAB, NEW SEAT TRACK. INSTALLED NEW SEAT TRACK, REF SRM 51-30-2. REPAIR IS CLASSIFED AS MAJOR.