What was found
EO 4753A448, A CRACK WAS FOUND IN THE BS 420, S-10R FRAME WEB . THE DAMAGE WAS TRIMMED OUT AND REPAIRED IAW NRC 500789 AND SRM 53-10-04, FIGURE 11. PART 1 OF THIS EO DOCUMENTS THE FRAME WEB REPAIR IAW NRC 500789 AND SRM 53-10-04, FIGURE 11. THE REPAIR CONSISTS OF ONE 0.063 INCH THICK DOUBLER MADE FROM 2024-T42 ALUMINUM. THE REPAIR PARTS ARE INSTALLED USING BAC415BB5D AND BACR15ET7AD RIVETS. REFER TO SRM 53-10-04, FIG 11. THE REPAIR IAW PART 1 OF THIS EO IS INTERIM AND ACCEPTABLE PROVIDED THAT INSPECTION IAW SB 747-53A2265 CONTINUE AFTER THE REPAIR IAW PART 1 OF THIS EO AT 3,000 CYCLE INTERVALS. THIS REQUIREMENT IS COMPLIED WITH IAW EO 4753A448, THEREFORE NO ACTION IS REQUIRED IAW THIS EO.