THE HONG KONG GOVERNMENT GAZETTE, DECEMBER 17, 1937.
in the case of aircraft being on or over the territory of a State by [Schedule the law of which any other period is substituted for the period IV,-contd.] aforesaid, during the period so substituted.
(2) Throughout the period during which the said rules are to be complied with no other lights shall be displayed which may be mistaken for the lights required to be displayed by those rules.
(3) The lights required to be displayed by the said rules shall not be dazzling.
2.--(1) In the event of the failure of any light which is required by this Section of this Schedule to be displayed by aircraft in flight, the aircraft concerned shall, if the light cannot immediately be repaired or replaced, land as soon as it can do so without danger.
(2) Where owing to the difficulty of producing lamps to meet the requirements of this Section of this Schedule, as regards sector lights, an overlap of those lights is unavoidable, the overlap shail be kept as small as possible; there shall be no sector in which no light is visible.
3. Nothing in this Section of this Schedule shall interfere-
(a) with the operation of any special rules made by any State with respect to additional signal or station lights for military air- craft, aircraft exclusively employed in State service or aircraft in group formation; or
(b) with the exhibition of recognition signals adopted by owners of aircraft which have been authorized by their respective Govern- ments and duly published.
Lights and Visual Signals to be displayed by Aircraft.
Flying Machines.
4. (1) Every flying machine in the air or the landing area of a land aerodrome shall display the following lights, that is to say:
(a) on the right side, a green light, fixed so as to show an unbroken light, visible at a distance of at least 5 miles, throughout a dihedral angle of 110° formed by two vertical planes, of which one is parallel to the plane of symmetry of the aircraft and directed dead ahead, and the other is directed to the right;
(b) on the left side, a red light, fixed so as to show an unbroken light, visible at a distance of at least 5 miles, throughout a dihedral angle of 110° formed by two vertical planes, of which one is parallel to the plane of symmetry of the aircraft and directed dead ahead,
and the other is directed to the left;
(c) at the rear, a white light, fixed so as to show astern an unbroken light, visible at a distance of at least 3 miles, throughout a dihedral angle of 140° formed by two vertical planes and bisected by the plane of symmetry of the aircraft.
(2) In
cases where, in order to comply with the foregoing provisions of this paragraph, a single light has to be replaced by several lights, the field of visibility of each of those lights shall be so limited that only one of them can be seen at a time.
(3) In the case of a flying machine with a maximum span of less than 65 feet, the lights required by this paragraph to be displayed may be combined in one or more lamps placed centrally, provided that the requirements of this paragraph as to colour and visibility are complied with.
5. Every flying machine under way on the surface of the water shall display lights in accordance with the following provisions of this paragraph:
(a) if it is under control and is not being towed, it shall display the lights specified in paragraph 4 of this Schedule and in addition, forward, a white light, fixed so as to show forward an unbroken light, visible at a distance of at least 3 miles, throughout a dihedral angle of 220° formed by two vertical planes and bisected by the plane of symmetry of the aircraft;
(b) if it is being towed, it shall display the lights specified in paragraph 4 of this Schedule;
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