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LIGHTS AND SIGNALS 45 [[image]] (3) To prohibit taking off or movement towards the taking off point, he shall raise a small red flag; [[image]] (4) To prohibit landing, he shall wave a small red flag vertically above his head. [[image]] (c) An aircraft wishing to land at night, without being compelled to do so, on an aerodrome having a ground control, shall, before landing, ask permission by a signal made either by radiotelegraphy or radiotelephony or by means of a lamp or a projector, the use of the navigation lights for this purpose not being permissible. The visual signal, sent by International Morse Code, shall be composed of the last three letters of the registration group of the aircraft; this signal shall be repeated for as long as may be necessary. The reply will be given from the ground to the aircraft either by radiotelegraphy or radiotelephony