Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A330 and A340 series airplanes. This action requires modifying the bottom skin panel 3 (located aft of the rear spar). This action is necessary to prevent corrosion and consequent reduced structural integrity of the wings due to lack of cold expansion of an existing drain hole, which could lead to cracks initiating from that drain hole; and the incorrect location of the drain hole, which can allow moisture to be trapped. This action is intended to address the identified unsafe condition.