What was found
DURING BASIC CHECK IN SAT, INSPECTION DISCOVERED CORROSION ON THE AFT CABIN LT AFT BEAM, PN 170-65669-003, UPPER SURFACE ON THE SUBJECT FLOORBEAM. THE DAMAGE DIMENSIONS ARE REPORTED AS FOLLOWS. 1.3 INCH X .90 INCH TO A MAXIMUM DEPTH OF .020 INCH DEEP & 1.3 INCHES X .70 INCH TO A MAXIMUM DEPTH OF .050 INCH DEEP, REF FIGURE 1. REQUESTED & RECEIVED RELIEF IN THE FORM OF ETD2016-170-004262 WHICH PROVIDES A PERMANENT REPAIR BY INSTALLING A REPAIR DOUBLER USING THE PRINCIPLES OF SRM PART II 53-23-10-RE 02P. ENGINEERING HAS CLASSIFIED THIS REPAIR AS A MAJOR REPAIR. THIS REPAIR DOES NOT AFFECT FCS, BUT REQUIRES FOLLOW UP INSPECTIONS. EO E175-53MR-236.1 WILL BE ISSUED TO ACCOMPLISH FOLLOW UP INSPECTIONS. TASK 53-23-005-0001, INTERNAL GVI THRESHOLD OF 20,483FC OR 27,242FH, INTERVAL OF 10,133FC OR 13,476FH PER ETD2016-170-004262 ANAC DER FORM ATTACHED, IS SUFFICIENT & IS MET USING THE INSPECTION REQUIREMENTS, MPG & MRBR REVISION 10. THRESHOLD IS COUNTED SINCE NEW. ACCOMPLISHMENT OF THIS MAJOR REPAIR WAS ON EO E175-53MR-236 UNDER WO 2013215.