Article V — Formalities, effects and registration of contracts of sale
1. For the purposes of this Protocol, a contract of sale is one which:
(a) is in writing;
(b) relates to an aircraft object of which the seller has power to dispose; and
(c) enables the aircraft object to be identified in conformity with this Protocol.
2. A contract of sale transfers the interest of the seller in the aircraft object to the buyer according to its terms.
3. Registration of a contract of sale remains effective indefinitely. Registration of a prospective sale remains effective unless discharged or until expiry of the period, if any, specified in the registration.