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REGISTRATION AND MARKING    25

In the case of all aerostats, the side marks shall be visible both from the sides and the ground.
(b) Aeroplanes--The marks shall be painted once on the lower surface of the main plane structure and once on the upper surface of the main plane structure, the top of the letters to be towards the leading edge. They shall also be painted along each side of the fuselage or of the body between the main planes and the tail planes.
(c) Other aerodynes--The provisions of paragraph (b) shall be applicable to other aerodynes in so far as the latter comprise corresponding elements on which marks could be placed.
(d) Experimental aircraft--Aircraft flown only for experiment or test shall display the letter "X" following the nationality and registration markings. (Amendment dated November 3, 1945.)

SECTION III

MEASUREMENTS OF NATIONALITY AND REGISTRATION MARKS

15. (a) Aerostats--In the case of airships the height of the marks shall be equal to at least one-twelfth of the perimeter of the airship at the maximum cross section.
  In the case of balloons the height of the marks shall be equal to at least one-fifteenth of the maximum horizontal circumference of a spherical balloon, and in the case of a non-spherical balloon, equal to at least one-twelfth of the perimeter of the balloon at the maximum cross section.
(b) Aeroplanes--The marks to be borne on the wings and the fuselage or body of an aeroplane shall, as regards each group of marks, be formed of letters of equal height, as large as possible without, however, touching the visible outline of the wings, fuselage or body.
(c) Other aerodynes--The provisions of paragraph (b) shall be applicable to other aerodynes in so far as the latter comprise corresponding elements on which marks could be placed.
(d) General--In the case of all aircraft the letters of the nationality and registration marks need not exceed 4 feet in height, and where displayed on the fuselage or body of an aeroplane need not exceed 2 feet in height.
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