956 THE HONG KONG GOVERNMENT GAZETTE, DECEMBER 17, 1937.
[Schedule
(b) to authorize taking off, he shall lower a small white flag IV-contd.] in the direction of taking-off as shewn in the diagram below
(c) to prohibit taking-off or movement towards the taking-off point, he shall raise a small red flag as shewn in the diagram below
(d) to prohibit landing, he shall wave a small red flag vertically above his head as shewn in the diagram below
(3) (a) 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 radio- telegraphy or radiotelephony or by a visual signal made by means of a lamp or projector but not by means of the navigation lights.
(b) The visual signal, sent by International Morse Code, shall be composed of the last three letters of the registration group of the aircraft and shall be repeated for as long as may be necessary. (c) The reply shall be given from the ground to the aircraft either by radiotelegraphy or radiotelephony or by visual signal, pro- vided that, when permission has been asked by visual signal, the reply shall always be given by visual signal.
(d) When the reply is given by visual signal, such signal shall consist of a repetition of the three-letter sign specified in sub- paragraph (b) of this sub-paragraph, sent by means of the signalling lights of the aerodrome and made either by a group of lights arranged on a horizontal plane at the apexes of an equilateral triangle, each side of which measures not less than 3 nor than 10 feet, or by a luminous beam directed at the aircraft.
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(e) In giving the visual signal in reply, the colour green shall be used to give permission to land and the colour red shall be used to prohibit landing.
19.-(1) At every aerodrome the firing of a red pyrotechnical light or the display of a red flare from the ground, whether by day or by night and notwithstanding any previous permission, shall be taken as an instruction to aircraft in flight that they are not to land for the moment and to aircraft manoeuvring on the landing area that they are to cease to move.
(2) At aerodromes provided with the triangular device specified in paragraph 18 (3) (d) of this Schedule the emission by means of such device of intermittent red lights shall, whether by day or by night and notwithstanding any previous permission, be taken as an instruction to aircraft in flight that they are not to land for the moment.
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