What was found
DURING INSPECTION DURING THE B6 BASIC CHECK, CORROSION DAMAGE WAS FOUND AT THE UPPER FLANGE OF THE FR11 CROSSBEAM. REFERENCE ETD2019-170-055897B FIGURE 1 FOR DETAILS. REQUESTED AND RECEIVED ETD2019-170-055897B TO REPAIR THE DAMAGE. THIS EO IS BEING ISSUED TO PROVIDE INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIR OF THE CORROSION DAMAGE BY BLEND-OUT AND REPAIR DOUBLER INSTALLATION (P/N 170-03246-003). BECAUSE THE FR11 FLOOR CROSSBEAM IS PSE/FCS, ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR. FOLLOW-ON INSPECTIONS FOR THIS REPAIR ARE NOT REQUIRED PER ETD2019-170-055897B. EO E175-53MR-420 IS BEING ACCOMPLISHED BY WO