of the country in which leave to serve the document has been given and the request shall be as in Form 7 in Appendix 6 to these Rules with such variations as circumstances may require; Civil Form 8 (b) The party requesting a copy of a document for service under this section shall, at the time of requesting the same, file a praecipe as in Form 8 in appendix 6 to these Rules. (c) An official certificate, or declaration upon oath or otherwise, transmitted through the diplomatic channel by the Government or Court of a foreign country to which this provision applies, to the Court, shall, provided that it certifies or declares the document to have been personally served, or to have been duly served upon the defendant in accordance with the law of that foreign country, or words to that effect, be deemed to be sufficient proof of service, and shall be filed on record as, and be equivalent to an affidavit of service within the requirements of these Rules in that behalf; Civil Form 9 (d) Where an official certificate or declaration transmitted to the Court in the manner provided in paragraph (c ) of this sub-rule certifies or declares that efforts to serve a document have been without effect, the Court or a Judge may, upon the ex parte application of the plaintiff, order substituted service of the document, and the document and a copy of it and the order shall be sealed and transmitted to the permanent secretary to the Ministry of justice in manner aforesaid together with a request in Form 9 of Appendix 6 to these Rules, with such variations as circumstances may require. (2) Nothing herein contained shall in any way prejudice or affect any practice or power of the Court under which when lands, funds, chooses in action, rights or property within the jurisdiction are sought to be dealt with or affected, the Court may, without affecting the exercise of jurisdiction over any person out of the jurisdiction, cause such person to be informed of the nature or existence of the proceedings with a view to such person having an opportunity of claiming, opposing or otherwise intervening.. Service out of the jurisdiction under the Civil Aviation Act 19. (1) where, for the purpose of an action under the Civil Aviation Act and the Convention therein set out, leave is given to serve a notice of writ of summons upon a high contracting party to the Convention other than Nigeria, the provisions of this order shall apply. (2) The notice shall specify the time for entering an appearance as limited in pursuance of rule 15 of this order. (3) The notice shall be sealed with the seal of the Court for service out of jurisdiction, and shall be transmitted to the Ministry of Justice, together with a copy thereof transmitted into the language of the country of the defendant, and with a request for transmission to the Minister responsible for matters relating to foreign affairs for further transmission of the same to the Government of that country. Civil Form 10 (4) The request shall be in Form 10 in appendix 6 to these Rules, with such variations as circumstances may require.