What was found
THE LEFT LOWER WING PLANK HAS CORROSION AT THE FUEL TANK ACCESS CUTOUT FOR PANEL 540CB HOLE NR 5 AT WS 76.161 APPROX .004 INCH DEEP BY 1.5 INCH LONG IN THE CRITICAL AREA OF THE FORWARD HOLE EDGE AND APPROX .004 INCH DEEP BY 2.25 INCH LONG ON THE CRITICAL AREA OF THE AFT HOLE. MAINTENANCE REPAIRED FUEL TANK ACCESS HOLE CUTOUT WING PLANK IAW BOMBARDIER REO 601R-57-21-030 REV D. (M)