What was found
DURING B-6 BASIC CHECK AT EAMS , CORROSION DAMAGE WAS DISCOVERED ON THE UPPER FLANGE OF THE FR84 CROSSBEAM IN THE CABIN FLOOR STRUCTURE OF THE CENTER FUSELAGE III (P/N 170-86044-001) AT X= +22847.0 MM, Y= +400.0 MM TO +900.0 MM, Z= -490.0 MM. THE DAMAGE MEASURED 0.0.14 REMOVED AT +425.0 MM, 0.020 AT +550.0 MM, 0.016 AT +650.0 MM 0.011 AT +750.0 MM AND 0.017 AT 875.0 MM. EAMS REQUESTED AND RECEIVED ETD2019-170-104222 TO PERFORM A BLENDOUT AND DOUBLER REPAIR IN ACCORDANCE WITH THE PRINCIPLES OF SRM PART II 53-00-10/REPAIR 03P. BECAUSE THE FR84 FLOOR CROSSBEAM IS PSE/FCS, ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR. SUPPLEMENTAL FOLLOW-ON INSPECTIONS ARE NOT REQUIRED PER ETD2019-170-104222. EO E175-53MR-433 IS BEING ACCOMPLISHED BY WO 2706271.