263. (1) The provisions of Chapter 19 apply to special trade passenger ships as they apply to other passenger ships and no special trade passenger ship shall proceed on any voyage unless she has, in addition to the Passenger Ship Safety Certificate prescribed in Chapter 19, a Special Trade Passenger Ship Safety Certificate, together with a Special Trade Passenger Ship Space Certificate, both of which shall be issued in duplicate, by the Principal Officer on receipt of a declaration of survey stating that a special trade passenger ship complies with the applicable requirements relating to special trade passenger ships. (2) The Certifying Officer or person so authorised by sub section (1) of section 262 to inspect the ship, shall, if he is satisfied that he can with propriety do so, grant to the master a certificate for clearance, that is to say, a certificate stating that all the requirements of this Part have been duly complied with and that in his opinion the ship is in all respects fit for the intended voyage and that the special trade passengers are in a fit state to proceed and that, if the ship is a pilgrim ship, the master's bond has been executed. (3) A special trade passenger ship attempting to go to sea may be detained until the certificates required by this section are produced to the Collector of Customs. (4) The Special Trade Passenger Ship Safety Certificate and the Special Trade Passenger Ship Space Certificate may be combined in one document and shall be issued for a period not exceeding one year.