Artikel 2

(1). If a Contracting State receives an application for a certificate of airworthiness in respect of an aircraft imported or being imported into its territory and subsequently to be entered on its register, it shall, subject to the other provisions of this Agreement, either:
(a) render valid the existing certificate of airworthiness of such aircraft, or
(b) issue a new certificate.
(2). However, if that State elects to issue a new certificate, it may, pending the issue thereof, render valid the existing one for a period not exceeding six months or for the unexpired period of the existing certificate, whichever is the lesser.