What percentage of runway coverage is considered contaminated?

Contaminated runway coverage refers to the amount of runway surface that is covered by substance such as snow, ice, water, or any material that could negatively impact aircraft performance during takeoff and landing. A runway is considered contaminated when it has more than 25% coverage of these substances. This percentage is critical in aviation safety, as it helps pilots and flight operations to assess the risk associated with landing or taking off on such surfaces. This standard aids in making informed decisions concerning flight operations, ensuring that safety protocols are adhered to regarding runway conditions. Hence, 25% is recognized as the threshold for a runway to be classified as contaminated.