What was found
DURING BASIC CHECK IN SAT, INSPECTION DISCOVERED CORROSION ON THE AFT CABIN LT AFT BEAM, PN 170-65669-003, UPPER FLANGE. VTSAA REQUESTED A REPAIR & RECEIVED ETD2015-170-055840A WHICH PROVIDES A PERMANENT REPAIR BY INSTALLING A REPAIR DOUBLER USING THE PRINCIPLES OF SRM PART II 53-23-10 REPAIR 03. THE CORROSION DAMAGE APPROX DIMENSIONS ARE 3.0 INCHES X 1.0 INCH WITH A MAXIMUM DEPTH OF .019 INCH DEEP. ENGINEERING HAS CLASSIFIED THIS REPAIR AS A MAJOR REPAIR. THIS STRUCTURE IS NOT FCS, BUT REQUIRES FOLLOW UP INSPECTIONS. EO E175-53MR-190.1 WILL BE ISSUED TO ACCOMPLISH FOLLOW UP INSPECTIONS IAW ETD2015-170-055840A ANAC DER FORM ATTACHED. REF INSPECTION INSTRUCTIONS, TASK 53-23-005-0001, INTERNAL GVI THRESHOLD OF 20,483 FC OR 27,242 FH, INTERVAL OF 10,133 FC OR 13,476 FH, IS SUFFICIENT & IS MET USING THE INSPECTION REQUIREMENTS, MPG & MRBR REVISION 10. THRESHOLD IS COUNTED SINCE NEW. ACCOMPLISHMENT OF THIS MAJOR REPAIR IS ON EO E175-53MR-190 UNDER WO 1923050.