What was found
RIGHT WING NR 3 FUEL TANK HAS A CRACKED RIB (APPOX. 5 INCHES LONG) INSIDE TANK PLATE NR 634 AT STATION XORS 402, ALONG LARGE OVAL FLAPPER CHECK VALVE. REMOVED FLIPPER DOOR FOR ACCESS IAW SRM 51-31-01, REMOVED FLIPPER DOOR HINGE IAW SRM 51-35-01, REMOVED STIFFENER IAW SRM.51-31-01. TRIMED CRACK AND CUT-OUT HOLE IAW SRM 51-31-01. FAB DOUBLER IAW SRM 52-20-00 FIG 33. OUT OF 7075-T6FAB DOUBLER ON TRAVELER T2/319454. NDT CRACK AND REINSTALLED DOUBLER IAW SRM 51-31-01. INSTALLED STIFFENER IAW SRM 51-31-01. INSTALLED FLIPPER DOOR HINGE IAW SRM 51-31-01. INSTALLED FLIPPER DOOR IAW SRM 51- 31-01.