What was found
DURING C/W AD 96-24-17R (AMEND NR 39-10229 EFF 1-27-97), INTERGRANULAR CORROSION WAS FOUND ON THE LOWER WEB OF THE RT REAR SPAR AFT FACE APPROXIMATELY 17 INCHES FROM THE WING ATTACH POINT. THE CORROSION HAD CAUSED A BULGE IN THE MATERIAL AND WAS APPROXIMATELY 50 PERCENT THROUGH THE THICKNESS OF THE SPAR. THE CORROSION WAS APPROXIMATELY 3 INCHES LONG AND 1.25 INCHES TALL. NO OTHER CORROSION FOUND. NO FOREIGN MATERIAL FOUND AGAINST THE SPAR.