Airworthiness Directives; Airbus SAS Airplanes

We propose to adopt a new airworthiness directive (AD) for all Airbus SAS Model A330-200 Freighter series airplanes, Model A330-200 and -300 series airplanes, and Model A340-200 and -300 series airplanes. This proposed AD was prompted by defects found during production tests of ram air turbine (RAT) units; investigation revealed that the defects were due to certain RAT hydraulic pumps having an alternative manufacturing process of the pump pistons. This proposed AD would require replacing any defective RAT hydraulic pump with a serviceable part and re-identifying the RAT module part number. We are proposing this AD to address the unsafe condition on these products.