What was found
CORROSION WAS FOUND ON THE AFT CARGO DOOR NUMBER 4 BEAM INNER CHORD AT D STATION 175 COMMOM TO A NUT PLATE SCREW HOLE. THE CORROSION WAS REMOVED BY BLENDING LEAVING A MINIMUM REMAINING THICKNESS OF 0.093 INCH FROM PARENT THICKNESS OF 0.125. A REPAIR STRAP OF 0.063 INCH 7075-T6 WAS INSTALLED OVER THE BLEND EXTENDING 3 FASTENERS ON EITHER SIDE OF DEEPEST LOCATION. ALODINE, PRIMER AND CIC WERE APPLIED TO THE AREA FOR CORROSION PREVENTION. EA COMP-52-009208.