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THE HONG KONG GOVERNMENT GAZETTE, JULY 27, 1928.
9. An airship when moored near the ground shall carry the lights specified in paragraphs 2 (a) and (e) and 3 of this Schedule.
In addition, if moored but not near the ground, the airship, the mooring cable, and the object to which moored, shall be marked in accordance with the provisions of paragraph 8 of this Schedule, whether by day or by night.
Sea anchors or drogues used by airships for mooring purposes on the water are exempt from this regulation.
10. A flying machine stationary upon the land or water but not anchored or moored shall carry the lights specified in paragraph 2 of this Schedule.
11. In order to prevent collisions with surface craft:--
(a) A flying machine when at anchor or moored on the water shall carry forward, where it
can best be seen, a white light, visible at a distance of at least 1 mile.
(b) A flying machine of 150 feet or upwards in length, when at anchor or moored on the water, shall, in the forward part of the lying machine, carry one such light, and at or near the stern of the flying machine, and at a height that it shall not be less than 20 feet lower than the forward light, another such light.
The length of a flying machine shall be deemed to be the overall length.
(c) Flying machines of 150 feet or upwards in span, when at anchor or moored in the water, shall in addition carry at each lower wing up one light as specified in (a) of this paragraph.
The span of a flying machine shall be deemed to be the maximum lateral dimension.
12. In the event of the failure at night of any of the lights specified under these rules to be carried by aircraft flying at night, such aircraft shall land as soon as it can do so without danger,
13. Nothing in these rules shall interfere with the operation of any special rules made by any State with respect to the additional station or signal lights for military aircraft, or for aircraft in formation, or with the exhibition of recognition signals adopted by owners of aircraft which have been authorised by their respective Governments and duly registered and published.
SECTION II,
Rules as to Signals.
14.--(u) An aircraft wishing to land at night on an acrodrome having a ground control shall, before landing, fire a green pyrotechnical light or flash intermittently a lamp or a projector other than the navigation lights. In addition, it shall make by international Morse Code, by means of sound or luminous signals, the two-letter group constituted by its nationality letter and the last letter of its registration mark.
(b) Permission to land will be given by the same call-sign from the ground, followed by a green pyrotechnical light, or flashing a green lamp intermittently.
15. The firing of a red pyrotechnical light or the display of a red flare from the ground shall be taken as
an instruction that aircraft are not to land.
16. An aircraft compelled to land at night shall before landing fire a red pyrotechnical light or make a series of short and intermittent flashes with its navigation lights.
17. When an aircraft is in distress and requires assistance, the following shall be the signals of distress to be used or displayed, either together or separately:-
(a) The international sigual, SOS, by means of visual or wireless signals;
(b) The international code flag signal of distress, indicated by NC;
(c) The distant signal, consisting of a square flag having either above or below it a ball,
or anything resembling a ball;
(d) A continuous sounding with any sound apparatus;
(c) A signal, consisting of a succession of white pyrotechnical lights fired at short intervals.
18. To warn an aircraft that it is in the vicinity of a prohibited zone and should change its course, the following signals shall be used:
(a) By day three projectiles discharged et intervals of 10 seconds each showing, on bursting, white smoke, the location of the burst indicating the direction the aircraft should follow. (b) By night: three projectiles discharged at intervals of 10 seconds each showing, on burst- ing, white lights or stars, the location of the burst indicating the direction the aircraft should follow,
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