What was found
DURING THE CURRENT B6 BASIC CHECK, CORROSION DAMAGE WAS DISCOVERED ON THE AFT PASSENGER (L2) DOOR LOWER THRESHOLD BEAM (P/N 170-65703-005) AT FASTENER HOLES AROUND THE AFT GIRT BAR FITTING DURING ACCOMPLISHMENT OF EO E175-5300-221.2 FOR A MODIFICATION OF THE CORROSION PROTECTION OF THE BEAM. REFERENCE FIGURE 1 FOR DETAILS OF THE DAMAGE. THE DAMAGE EXCEEDED THE ALLOWABLE LIMITS FROM SRM PART II 53-23-11/AD03, NECESSITATING THE REPLACEMENT OF THE LOWER THRESHOLD BEAM. THIS EO IS BEING ISSUED TO ACCOMPLISH THE PERMANENT REPAIR OF THE L2 DOOR THRESHOLD LOWER BEAM BY REMOVING AND REPLACING THE DAMAGED L2 DOOR THRESHOLD LOWER BEAM WITH A NEW PART. PART REPLACEMENT WILL BE ACCOMPLISHED IN ACCORDANCE WITH DRAWINGS LISTED IN THE REFERENCES AND SRM CHAPTER 51 STANDARD PRACTICES. SUPPLEMENTAL FOLLOW UP INSPECTIONS WILL NOT BE REQUIRED FOR DIRECT REPLACEMENT OF THE PART. BECAUSE THE L2 DOOR THRESHOLD LOWER BEAM (P/N 170-65703-005) IS A PSE AND REPLACEMENT IS COMPLEX, ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED BY ENGINEERING AS A MAJOR REPAIR. EO E175-53MR-444 IS BEING ACCOMPLISHED BY WO 2719869.