What percentage of the runway surface area must be contaminated for it to be considered "contaminated" according to international standards?

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For a runway surface to be classified as "contaminated" according to international standards, at least 25% of the runway surface area must be affected by contaminants such as snow, ice, or standing water. This threshold is important for ensuring safety and operational procedures, as it prompts operators to take necessary precautions, such as adjusting landing and takeoff techniques or limiting the types of aircraft that can safely operate on the runway in those conditions.

Contaminants can significantly impact aircraft performance, including reduced friction and altered aircraft handling characteristics. Therefore, recognizing when a runway becomes contaminated is essential for flight safety and adherence to established guidelines. The 25% threshold is widely accepted in aviation protocols to help maintain a balance between operational feasibility and safety during winter weather conditions.