What was found
LT WING INBOARD FLAP, INBOARD SUPPORT BEAM NR 4 HAS HOLE BORE CORROSION, CORROSION WAS FOUND IN THE 4 FLAP ATTACH FASTENER HOLES IN THE INBD SUPPORT BEAM OF THE INBOARD FLAP AT THE NR 4 SUPPORT LOCATION. THE HOLES WERE OVERSIZED TO REMOVED CORROSION, HFEC INSPECTED, BUSHED, AND NEW FASTENERS INSTALLED. THE REPAIR WAS ACCOMPLISHED PER ER/A 385477-14, REV A.