954
THE HONG KONG GOVERNMENT GAZETTE, DECEMBER 17, 1937.
[Schedule
(ii) when local conditions render unavoidable the use of gas IV,-contd.] boundary lights, such lights may be given an intermittent character;
•
(iii) when the boundary of the landing area cannot be marked, only the extremities of such landing area between which aircraft may move without danger shall be indicated by fixed aviation-yellow lights.
(3) At every water aerodrome open to public use and used for night flying the requirements specified in sub-paragraph (2) of this paragraph shall be complied with except in cases where compliance therewith is obviously impossible.
Distress, Urgency and Safety Signals.
17.-(1) (a) None of the signals referred to in this paragraph may be transmitted except with the authority of the commander or person responsible for the aircraft from which such signals are trans- mitted.
(b) When such signals are sent by radiotelegraphy or radio- telephony, the group or spoken expression shall be sent three times and followed by the group DE and the call sign, also sent three times, of the aircraft which sends it.
(2) As to distress signals:-
When an aircraft is threatened by grave and imminent danger and requires immediate assistance, the following signals shall be used or displayed, either together or separately, before the sending of a message :-
(a) In radiotelegraphy the signal SOS (-
(b) In radiotelephony the spoken expression "MAYDAY” (corresponding to the French pronunciation of the expression "m'aider').
(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 sigual, 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 intermittent 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-
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