Airworthiness Directives; Airbus Airplanes

We propose to adopt a new airworthiness directive (AD) for all Airbus Model A330-200, A330-200 Freighter, A330-300, A340-500, and A340-600 series airplanes; and A340-313 airplanes. This proposed AD was prompted by the discovery of Tartaric Sulfuric Anodizing (TSA)/Chromic Acid Anodizing (CAA) surface treatment in certain bulk cargo door frame holes of certain airplanes. This proposed AD would require inspection of the fuselage bulk cargo door frames at specific locations, and corrective action if necessary. We are proposing this AD to address the unsafe condition on these products.