Airworthiness Directives; Boeing Model 777 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 777 series airplanes, that requires replacement of nuts on the clevis assemblies that support the auxiliary tracks of the inboard leading edge slats. This amendment is necessary to prevent loose or missing nuts on the clevis assemblies, which could cause the inboard leading edge slats to be loose or in an incorrect position and result in partial or total failure or loss of the slats. This action is intended to address the identified unsafe condition.