Wash. Rev. Code § 14.20.070
Before issuing an aircraft dealer license, the secretary shall require the applicant to file with the secretary a surety bond in the amount of twenty-five thousand dollars running to the state, and executed by a surety company authorized to do business in the state. The bond shall be approved by the attorney general as to form and conditioned that the dealer shall conduct his or her business in conformity with the provisions of this chapter, RCW 47.68.250, and 82.48.100. Any person who has suffered any loss or damage by reason of any act by a dealer which constitutes ground for refusal, suspension, or revocation of license under RCW 14.20.090 has a right of action against the aircraft dealer and the surety upon the bond. Successive recoveries against the bond shall be permitted, but the aggregate liability of the surety to all persons shall in no event exceed the amount of the bond.
RCW 14.20.070
Surety insurance: Chapter 48.28 RCW.