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THE HONG KONG GOVERNMENT GAZETTE, NOVEMBER 12, 1937. 849
SCHEDULE.
SCHEDULE IV.
Rules as to Lights and Signals and Rules for Air Traffic.
PRELIMINARY.
Interpretation.
For the purposes of this Schedule-
(a) An aircraft shall be deemed to be "on the surface of the water' when any part of the aircraft is in contact with the water;
(b) An aircraft, being in the air or on the surface of the water, shall be deemed to be "under way" when it is not moored to the ground or to any fixed object on the land or in the water;
(c) An aircraft under way in the air or on the surface of the water shall be deemed to be "making way" when it has a velocity relative to the air or water respectively.
(d) An aircraft shall be deemed, not to be "under control" when it is unable to execute a manoeuvre required in respect of it by the rules laid down in this Schedule or by the Regulations for Preventing Collisions at Sea;
(e) The expression "landing area' means that part of an aero- drome which is reserved for departures and landings of aircraft;
(The expression "visible", when used in relation to lights, means visible on a dark night with a clear atmosphere;
(g) The expression "plane of symmetry", in relation to an air- craft, means the plane of symmetry passing through the longitudinal axis of the aircraft;
(h) The angular limits for lights laid down in the rules con- tained in Section I of this Schedule shall be determined when the aircraft is in its normal attitude for flying on a rectilinear horizontal
course.
SECTION I.
Rules as to Lights and Visual Signals to be displayed and Sound Signals to be made by Aircraft.
General.
1-(1) The rules as to lights to be displayed by aircraft con- tained in this Section of this Schedule shall be complied with by aircraft in all weathers during the period from sunset to sunrise or, in the case of aircraft being on or over the territory of a State by the law of which any other period is substituted for the period aforesaid, during the period so substituted.
(2) Throughout the period during which the said rules are to be be complied with no other lights shall be displayed which may 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 shall be kept us small as possible; there shall be no sector in which no light is visible.
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