Airworthiness Directives; The Boeing Company Airplanes

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by reports of latently failed engine fuel shutoff spar valves discovered during fuel filter replacement. This AD requires inspecting to determine the part numbers (P/Ns) of the motor-operated valve (MOV) actuators at the engine fuel shutoff spar valve positions, installing MOV actuators having a certain acceptable part number or software if necessary, and revising the maintenance or inspection program to add a new airworthiness limitation. We are issuing this AD to address the unsafe condition on these products.