What was found
EO: 4454A096 DURING C-CHECK, A CRACK WAS FOUND IN THE 311U2420-83 PYLON STRINGER TEE AT APPROX NAC STA 300, WL 144.7 ON THE OTBD SIDE. THE CRACK WAS TRIMMED OUT AND A NEW SECTION OF TEE SPLICED IAW SRM 54-51-02, REPAIR 2 WITH MINOR DEVIATIONS IAW EGAT EI T2010A54B-736. THE 311U2420-83 PYLON STRINGER TEE BAC1506-2115 EXTRUSION FROM 2024-0 ALUMINUM IAW QQ-A-200/3 HEAT TREATED TO T62 AFTER FORMING. THE REPAIR IAW SRM 54-51-02, REPAIR 2 WITH MINOR DEVIATIONS IAW EGAT EI T2010A54B-736 CONSISTS OF 2 ANGLES MADE FROM AND10134-1406 EXTRUSION MADE FROM 7075-T6 INSTALLED USING BACB30MY6K AND BACB30NY6K HI-LOKS WITH BACC30M6 COLLARS. THE MINOR DEVIATIONS IAW EGAT EI T2010A54B-736 ARE APPROVED BY MFG IN THE RDR DATED 21MAR2010 (SR 1-1550300031). THIS REPAIR IS A CATEGORY A REPAIR IAW SRM 54-51-02, REPAIR 2 AND DOES NOT REQUIRE SUPPLEMENTAL INSPS IAW FAR 121.1109. THE PART 1 REPAIR IS APPROVED BY SRM 54-51-02, REPAIR 2 WITH MINOR DEVIATIONS APPROVED BY MFG IN THE RDR DATED 21MAR2010 (FIG 3).