CS ADR-DSN.K.490 Wind direction indicator

(a)An aerodrome should be equipped with a sufficient number of wind direction indicators in order to provide wind information to the pilot during approach and take-off.

(b)Location: Each wind direction indicator should be located so that at least one wind direction indicator is visible from aircraft in flight, during approach or on the movement area before take-off, and in such a way as to be free from the effects of air disturbances caused by nearby objects.

(c)Characteristics:

(1)Each wind direction indicator should be in the form of a truncated cone made of fabric and should have a length of not less than 3.6 m and a diameter, at the larger end, of not less than 0.9 m.

(2)It should be constructed so that it gives a clear indication of the direction of the surface wind and a general indication of the wind speed.

(3)The colour or colours should be so selected as to make the wind direction indicator clearly visible and understandable from a height of at least 300 m. Having regard to background:

(i)where practicable, a single colour should be used; and

(ii)where a combination of two colours is required to give adequate conspicuity against changing backgrounds, they should preferably be orange and white, red and white, or black and white, and should be arranged in five alternate bands, the first and last bands being the darker colour.

(d)Night conditions: Provision should be made for illuminating a sufficient number of wind indicators at an aerodrome intended for use at night.