THE HONG KONG GOVERNMENT GAZETTE, NOVEMBER 12, 1937.
(c) in visual signalling
(i) The signal SOS (
apparatus.
) made with signalling
(ii) A succession of red pyrotechnical lights fired at short intervals.
(iii) The two flag signal corresponding to the letters "NC" of the International Code of Signals.
(iv) The distant signal, consisting of a square flag having, either above or below it, a ball or anything resembling a ball.
(d) In sound signalling
(i) The signal SOS (-
apparatus.
) made with any sound
(ii) A continuous sounding made with any sound apparatus.
(3) As to urgency signals:-
(a) When an aircraft wishes to give notice of difficulties which compel it to land without requiring immediate assistance, the follow- ing signals shall be used or displayed, either together or separately, before the sending of a message:-
-), sent
(i) In radiotelegraphy the group PAN with the three letters well separated so that the signals AN may not be transmitted into one signal P.
(ii) In radiotelephony the spoken expression PAN, which should be pronounced like the French word "PANNE”.
(iii) In visual signalling:
By day a succession of white pyrotechnical lights.
:
By night a succession of white pyrotechnical lights or a succes- sion of short and intermitent flashes with the navigation lights.
(b) When the signal PAN is sent by an aircraft without any message following, it shall signify that the aircraft has been com- pelled to land and is unable to transmit is intended message owing to the rapidity of the landing, but does not require immediate assistance.
(c) When an aircraft has a very urgent message to transmit concerning the safety of the aircraft or of any person on board or within range of assistance or the safety of another aircraft, or of any ship or vehicle, the following signals (which as a general rule will be addressed to a specific authority) shall be used or displayed, either together or separately, before the sending of the message :-
(i) In radiotelegraphy the group XXX (-
-) with the letters of each group and the successive groups clearly separated from each other.
(ii) In visual signalling either a succession of green pyrotechnical lights or a succession of green flashes made with signalling apparatus.
(4) As to safety signals:—
When an aircraft is about to transmit a message concerning the safety of navigation or giving important meteorological warnings, the following signals shall be used, either together or separately, before the sending of a message :
Comm
) with the (a) In radiotelegraphy the group TTT ( letters of each group and the successive groups clearly separated from each other.
(b) In radiotelephony the French word “SECURITE" corre- sponding to the English pronunciation of the syllables SAY-CURE- E-TAY.
(c) In visual signalling the international visual signalling procedure as laid down in the International Code of Signals.
Other Signals to or from Aircraft.
18. At aerodromes open to public use:-
(1) By day and by night when there is an officer controlling traffic, he shall, except as permitted by sub-paragraph ("") of this * paragraph, use the following signals (which may be preceded by the
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