What was found
AT APPROXIMATELY, BS 1000, LBL 80 - 84, AN AREA OF CORROSION WAS DISCOVERED ON THE WING CENTER SECTION FRONT SPAR INSTALLATION. THE CORROSION (LEVEL 2) EXISTED ON LOWER CHORD (P/N 65B 08234-2) AND REQUIRED MATERIAL REMOVAL THAT EXCEEDED MAX ALLOWABLE LIMITATIONS. MAX MATERIAL REMOVED (APPROX 0.30 INCH DEEP) WAS IN THE OUTER FORWARD CORNER AREA. A NESTED ANGLE REPAIR WAS ACCOMPLISHED PER THE GUIDELINES OF THE 747 SRM 51-40-04 TO SUIT THIS PARTICULAR CONDITION.