Bilateral Agreement: The term “bilateral agreement” means an executive agreement between the U.S. Government and the government of another country to facilitate the airworthiness approval or acceptance of civil aeronautical products exported from one country (contracting state) to the other. There are two types of bilateral agreements related to airworthiness:
Bilateral Airworthiness Agreements (BAA) and Bilateral Aviation Safety Agreements (BASA).
These agreements are not trade agreements, but rather technical cooperation agreements. These agreements are intended to provide a framework for the airworthiness authority of the importing country to give maximum practicable credit to airworthiness certification functions performed by the airworthiness authority of the exporting country using its own certification system. Since 1996, the United States no longer concludes Bilateral Airworthiness Agreements
Bilateral Airworthiness Agreement
Bilateral Airworthiness Agreements are executive agreements concluded prior to 1996 through an exchange of diplomatic notes between the U.S. Department of State and its foreign counterpart based on FAA technical recommendations.
Bilateral Aviation Safety Agreement
In addition to airworthiness certification, Bilateral Aviation Safety Agreements provide for bilateral cooperation in a variety of aviation areas, including maintenance, flight operations, and environmental certification. For aircraft certification, an additional document, an Implementation Procedures for Airworthiness, is developed to address specific areas such as design approvals, production activities, export airworthiness approval, post-design approval activities, and technical cooperation.
An example of a Bilateral Aviation Safety Agreement and the Goverrnment of Australia may be found here.