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24        Air Regulations, 1938

on specified routes, for specified periods, and upon compliance with specified condition.
(2) Certificates of airworthiness shall not remain valid unless endorsed by the Minister at intervals not exceeding twelve months.
(3) Aircraft in respect of which a certificate of airworthiness has been issued, under these regulations, may be inspected, at any time by an authorized representative of the Minister, and the Minister may, as a result of such inspection, cancel or suspend the certificate of airworthiness of any aircraft deemed to be unsafe.
(4) Any certificate relating to the airworthiness of an aircraft may be cancelled or suspended at any time by the Minister for cause.
12. A fee of five dollars shall be payable for a certificate of airworthiness of an aircraft conforming to a type an example of which has been certified as airworthy in any of His Majesty's Dominions or in any foreign country with which Canada has made a convention providing for the reciprocal acceptance of certificates of airworthiness. A fee of twenty-five dollars shall be payable for a certificate of airworthiness to any other aircraft.
13. No aircraft required to be registered shall fly unless it bears the prescribed nationality and registration marks.
(See I.C., Art. 10.)

Section II
Location of Marks on Aircraft
14. In the case of an aircraft registered in Canada the nationality mark shall be the letters "CF" and the registration mark the assigned combination of three capital letters. They shall be painted on the aircraft (or affixed by any other means ensuring a similar degree of permanence) in the following manner:-
(a) Aerostats - In the case of airships the marks shall be painted near the maximum cross section so as to appear on both sides and on upper surface equidistant from the letters on the sides.
In the case of balloons the marks shall appear twice near the maximum horizontal circumference of a spherical balloon and shall be placed as far as possible from one another and, on a non-spherical balloon, near the maximum cross section on both sides immediately above the rigging band on the points of attachment of the basket suspension cable.