What was found
DURING C-CHECK, DAMAGE WAS FOUND IN THE 65B07942-26 INTERCOSTAL ON THE NWW SIDEWALL WL 153 STIFFENER BETWEEN BS 260 AND 280.THE INTERCOSTAL WAS REPLACED USING A 141U1193-43 INTERCOSTAL WHICH IS PART OF THE MODIFICATION IAW SB 747-53A2562, REV 2. PART 1 OF THIS EO DOCUMENTS THE INTERCOSTAL REPAIR IAW NRC 270 AND MFG SR 1-1573014701. THE REPAIR CONSISTS OF THE INSTALLATION OF THE 141U1193-43 MODIFIED INTERCOSTAL. THE INSTALLATION OF THE MODIFIED INTERCOSTAL IS FAA APPROVED BY A MFG AR IAW THE FAA FORM 8100-9 DATED 30APR2010 INCLUDED IN SR 1-1573014701 (SEE FIG 3). THE FAA FORM 8100-9 DATED 30APR2010 REQUIRES CONTINUED INSP IAW AD 2006-22-15. THE REQUIRED INSPECTIONS ARE IAW EO 4753A459 AND MRI 5311001707, THEREFORE NO ADDITIONAL INSPECTIONS ARE REQUIRED IAW THIS EO.