ED Decision 2021/003/R
PROCEDURES FOR USE OF SAND OR GRIT
The application rate depends on several parameters including temperature, wind speed, vehicle speed, the quality of the material, wear and tear from operations and local experience. Consideration needs to be given to the application rate in order to achieve the desired effect. Very low application rate may only tolerate a very limited number of operations or pass by the sweeping machines, whereas higher application rates may be detrimental to the effectiveness of the treatment.
In order to ensure that the sand or grit is in contact with the aeroplane tyres during operations, the surface needs to be free of any loose contaminants. In practical terms, sand or grit is visible during operations.
Light precipitation or drifting snow needs to be removed to ensure the effectiveness of the treatment.
The need to ensure that the material maintains the required specification until application requires that actions be taken in order to ensure that no foreign objects are mixed with the sand or grit from origin to the dispenser vehicle, and storage is in a suitable environment to avoid the formation of frozen lumps.
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