When more than 25 % of the runway surface area within the required length and width being used is covered by water, slush, snow or ice more than 3 mm deep |
When 75 % of the required runway length and width are covered by contaminants such as snow, frost, ice or sand |
When more than 50 % of the runway surface area within the required length and width being used is covered by water, slush, snow or ice more than 3 mm deep |
When more than 50 % of the required runway length and width are covered by contaminants such as snow, frost, ice or sand |
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