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36  AIR REGULATIONS, 1938

B.-Ground Markings

Lights and Signals on and in the Vicinity of Aerodromes Open to Public Use

12. At every land aerodrome open to public use, the boundaries of the landing area shall, by means of suitable markings, be rendered clearly visible both to aircraft in the air and to aircraft manoeuvring on the landing area. In addition, a circle marking may be placed on the landing area. All obstructions existing on a landing area shall be clearly marked. In case part of the marked landing area should become unfit for use, this part shall be delimited by clearly visible markings or flags, and may, in addition, be indicated by one or more clearly visible crosses. 

13. At every aerodrome open to public use: 
(a) (1) The direction of the wind at the landing area shall be clearly indicated by one or more of the recognized methods, e.g., conical streamers, smudge fire, etc.;

(2) If there is a landing T, it shall be used to indicate the compulsory direction for landing and taking off, even should the direction not correspond to the direction of the wind. Normally, the T shall be placed so that the long arm lies along the direction of the wind, with the cross arm set at that end of the long arm from which the wind is blowing. In the event of there being no wind or a slight irregular wind, the T shall be fixed in the direction in which the landing or departure is to be made, and the fact that it is fixed shall be signalled by the presence of a ball, mounted on a mast on the signal area and clearly visible both to aircraft in flight and to those manoeuvring on the landing area; 

(b) When, by way of exception, at certain aerodromes, the landing area is regarded as divided into two approximately equal zones, one for departure and the other for landing, as provided for in paragraph 43 of this Part, this special arrangement must be indicated by a full star of five points (constituted by a regular non-convex pentagon which could be inscribed in a circle of not less than 50 feet diameter).