ICAO has developed a globally harmonized methodology for assessing and reporting runway surface conditions. It helps to mitigate the risk of runway excursions.
It’s a new ICAO requirement to report the runway surface condition of the airport operator and pilot to identify the actual situation of runway surface friction and surface contaminants concerning aircraft performance.
Runway condition assessments are conducted regularly, and information is reported based on different contaminant types, such as snow, ice, slush, and water. The runway's condition is reported in terms of the type and depth of contaminants present. Different contaminant codes represent various runway surface conditions, with codes for dry, damp, wet, contaminated, compacted snow, ice patches, and other specific conditions.
Runway Surface Condition Assessment, Measurement and Reporting, ICAO Cir 329 AN/191
https://skybrary.aero/sites/default/files/bookshelf/3841.pdf
Generally for the runway condition reporting, first, we need to assess the surface contaminants according to the Runway Condition Assessment Matrix (RCAM), and then we need to report the condition of runway contaminants defined in terms of Runway Condition Code (RWYCC) as defined earlier by ICAO. Each Airport Operator needs to timely report the surface condition as a Runway Condition Report (RCR) by using appropriate information dissemination tools such as SNOWTAM, ATIS, or ATC verbal Communication to the Pilot.
For a clear understanding, please refer following link.
https://www.icao.int/WACAF/Documents/Meetings/2021/GRF/3.%20RCAM%20and%20RCR.pdf
https://www.youtube.com/watch?v=RwA3Hbdc7cc
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