What was found
THE LEFT LOWER WING PLANK HAS CORROSION AT THE FUEL TANK ACCESS CUTOUT FOR PANEL 550AB HOLE NR 9 WS 163 APPROX .005 INCH DEEP BY .25 INCH LONG IN THE CRITICAL AREA ON THE FORWARD HOLE EDGE AND APPROX .005 INCH BY 1 INCH THE CRITICAL AREA ON THE AFT HOLE EDGE. MAINTENANCE REPAIRED FUEL TANK ACCESS HOLE CUTOUT WING PLANK IAW BOMBARDIER REO 601R-57-21-030 REV D. (M)