What was found
UPON ANNUAL INSPECTION, EXTENSIVE CORROSION WAS NOTED ON THE TRIM TAB AT THE ACTUATOR ARM TO SKIN CONNECTION. THE TRIM TAB WAS REMOVED, AND THE CORROSION AREA WAS MEDIA BLASTED, AFTER THE AREA WAS CLEANED AND STRIPPED CRACKS WERE NOTED IN THE SKIN UNDER THE ACTUATOR ARM MOUNTING PAD. UPON DISASSEMBLY OF THE TRIM TAB FOR RESKIING AND REUSING OF THE SERVICEABLE PARTS, A CRACK WAS NOTED IN THE CORNER OF THE L/H TRIM TAB INBD RIB. RIB P/N 63587-000, SKIN P/N 63586-810, TRIM TAB ASSY. P/N 63585-000.