5.1 INDICATORS AND SIGNALLING DEVICES

5.1.1 Wind Direction Indicators

Application

5.1.1.1 Standard - An aerodrome shall be equipped with at least one wind direction indicator.

Location

5.1.1.2 Standard - A wind direction indicator shall be located so as to be visible from aircraft in flight or on the movement area and in such a way as to be free from the effects of air disturbances caused by nearby objects.

5.1.1.3 Recommendation - Aerodromes with runways greater than 1200 m should have a wind direction indicator located at each end of the runway at a point approximately 60 m outwards from the runway edge and approximately 150 m inwards from the approach end.

Note - Where runways intersect near the threshold or where parallel runways are separated by 180 m or less between centre lines, one wind direction indicator may be suitably located to serve both runways.

5.1.1.4 Recommendation - Aerodromes with runways 1200 m or less in length should have a wind direction indicator centrally located on the aerodrome except that at aerodromes with only one runway the wind direction indicator should be centrally located along the runway and approximately 60 m from the edge.

Note - If a location near the apron would be of greater value to the pilot in selecting the runway for takeoff at locations where airport advisory service is not provided such a site may be selected in lieu of the centre of the aerodrome or runway complex. In such cases, the possible effects of buildings causing false wind indications need to be considered.

Characteristics

5.1.1.5 Standard - The height of wind direction indicators shall not exceed a height of 7.5 m when located in the runway strip.

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Figure5-1. Wind Direction Indicator

Figure 5-1. Wind Direction Indicator

5.1.1.6 Recommendation - The 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. 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. 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. Where practicable, a single colour, preferably white or orange, should be used. 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. (See Figure5-1)

5.1.1.7 Standard - Provision shall be made for illuminating at least one wind indicator at an aerodrome intended for use at night.