What was found
THE LEFT LOWER WING PLANK HAS CORROSION AT THE FUEL TASK ACCESS CUTOUT FOR PANEL 540EB HOLE NR 7, WS 116.366 APPROX .004 INCH DEEP BY 2 INCH IN THE CRITICAL AREA ON THE FORWARD HOLE EDGE AND APPROX .004 INCH DEEP BY 1 INCH LONG IN 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.