Artikel 83 bis

(a). Notwithstanding the provisions of Articles 12, 30, 31 and 32 (a), when an aircraft registered in a contracting State is operated pursuant to an agreement for the lease, charter or interchange of the aircraft or any similar arrangement by an operator who has his principal place of business or, if he has no such place of business, his permanent residence in another contracting State, the State of registry may, by agreement with such other State, transfer to it all or part of its functions and duties as State of registry in respect of that aircraft under Articles 12, 30, 31 and 32 (a). The State of registry shall be relieved of responsibility in respect of the functions and duties transferred.
(b). The transfer shall not have effect in respect of other contracting States before either the agreement between States in which it is embodied has been registered with the Council and made public pursuant to Article 83 or the existence and scope of the agreement have been directly communicated to the authorities of the other contracting State or States concerned by a State party to the agreement.
(c). The provisions of paragraphs (a) and (b) above shall also be applicable to cases covered by Article 77.