Wash. Rev. Code § 47.68.290
The department may confer with or hold joint hearings with any agency of the United States in connection with any matter arising under this chapter or relating to the development of aeronautics.
The department may avail itself of the cooperation, services, records, and facilities of the agencies of the United States as fully as may be practicable in the administration and enforcement of this chapter, and shall furnish to the agencies of the United States such services, records, and facilities as are practicable.
The department shall report to the appropriate agency of the United States all accidents in aeronautics in this state of which it is informed, and shall in so far as is practicable preserve, protect, and prevent the removal of the component parts of any aircraft involved in an accident being investigated by it until the federal agency institutes an investigation.
RCW 47.68.290