Airworthiness Directives; Airbus SAS Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Airbus SAS Model A350-941 airplanes. This AD was prompted by a determination that ram air turbine (RAT) performance may be below the expected (certificated) level when the landing gear is extended. This AD requires installing flight control and guidance system (FCGS) software (SW) X11 Standard (STD), as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.