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THE HONG KONG GOVERNMENT GAZETTE, NOVEMBER 12, 1937.
last three letters of the registration group of the aircraft to which the signal is addressed sent in the International Morse Code by using a luminous beam of the same colour as the signal which is to follow):
(a) to authorise movement on the landing area other than taking-off, he shall direct at the aircraft an intermittent white luminous beam;
(b) to authorise taking off, he shall direct at the aircraft a continuous white luminous beam;
(c) to prohibit taking off or any movement on the landing area, he shall direct at the aircraft an intermittent red luminous beam.
(2) By day, when there is on the landing area an officer con- trolling traffic, he may use the following signals:-
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(a) to authorise movement on the landing area other than taking-off, he shall wave a small white flag in the direction to be followed as shewn in the diagram below
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(b) to authorise taking off, he shall lower a small white flag 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
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(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.