What was found
DURING C-CHECK, CORROSION AND CRACKING WAS FOUND IN THE 65B04161-17, STR 49L BETWEEN BS 2180 AND 2200. DAMAGE WAS TRIMMED OUT AND A NEW STR SECTION WAS INSTALLED IAW REA MF00664R0004. THE 65B04161-17 STRINGER IS MADE FROM BAC1498-144 EXTRUSION IN 7075-0 SHEET IAW QQ-A-250/12 HEAT TREATED TO T6 OR T62. PART 1 OF THIS EO DOCUMENTS THE REA MF00664R0004. THE REPAIR IAW PART 1 OF THIS EO AND REA MF00664R0004 IS APPROVED BY MFG VIA AN FAA FORM 8100-9 ISSUED ON 26 MARCH 2010 (FIGURE 4). PART 2 OF THIS EO IS TO BE DETERMINED BASED ON A STAGE 3 APPROVAL THAT WILL BE PROVIDED BY MFG. REPAIR ACCOMPLISHED IAW PART 1 OF THIS EO IS FAA APPROVED IAW FAA FORM 8100-9 DATED 26MAR2010 (FIGURE 4). PART 2 INSP WILL ALSO BE FAA APPROVED WHEN IT IS PROVIDED BY MFG.