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The procedure to be followed in the application of the provisions of this Agreement may be the subject of direct communication between the competent authorities concerned with the issue and validation of certificates of airworthiness in each of the Contracting States. The decision of a Contracting State in regard to interpretation or application of its own laws, regulations and requirements relating to airworthiness shall, for the purposes of this Agreement, be final and shall be binding upon any other Contracting State.