THE HONG KONG GOVERNMENT GAZETTE, NOVEMBER 12, 1937.
(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 than 10 feet, or by a luminous beam directed at the aircraft.
nor more
(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.
20. To require an aircraft to land, the following signals shall be used: --
(a) By day, a series of projectiles discharged at intervals of 10 seconds, each showing on bursting black smoke;
(b) By night, a series of projectiles discharged at intervals of 10 seconds, each showing on bursting white lights or stars.
In addition, when necessary to prevent the landing of aircraft other than the aircraft required to land, an intermittent white luminous beam shall be directed at the aircraft whose landing is required.
21. To warn an aircraft that it is in the vicinity of a prohibited area and should change its course, the following signals shall be used:-
(a) By day, a series of projectiles discharged at intervals of 10 seconds, each showing on bursting orange smoke;
(b) By night, a series of projectiles discharged at intervals of 10 seconds, each showing on bursting orange lights or stars.
Provided that, when the authority requiring the change of course referred to in this paragraph is able to establish radioelectric communication with the aircraft, such requirement may be indicated by that method of communication.
SECTION III,
General Rules for Air Traffic.
22. Subject to the provisions of paragraphs 29 and 35 (a) and (c) of this Schedule, flying machines shall always give way to gliders and to balloons, fixed or free, and to airships, and airships shall always give way to gliders and to balloons, whether fixed or free.
23. An airship which is under way and which is not under control or which has voluntarily stopped its engines shall, for the purposes of the provisions of this Section of this Schedule, be classed as a free balloon.
24.--(1) When circumstances permit, an aircraft can ascertain risk of collision with another aircraft by carefully watching the successive compass bearings and angles of elevation of the other aircraft and it shall consider that risk of collision with the other aircraft exists if neither the bearing nor the angle of elevation changes appreciably and if the distance between the two aircraft diminishes.
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