What was found
INSPECTION TYPE: D, MAIN DECK BS 1145 TO 1158, RBL 11 SEAT TRACK OTBD FLANGE FOUND CORROSION. REPAIRED IAW HX RS R-53-45-37310 REV A & EO B747-5310-46129-A, ORIG MATL'S BAC1520-1873-7075T6511 & FLANGE THICKNESS 0.12", CORRODED. BLENDED D=0.077", W=1", L=2.5" (2 LOCATIONS), FINAL CUTOUT SIZE'S 1.1" X 3.25" AT FWD SIDE& 1.1" X 3.625" AT AFT SIDE, CLASSIFIED AS A MAJOR REPAIR WITH MATL 7075T6-0125IN AS REPAIR STRAP, REPAIR SIZE IS 25" X 1.25".