ICAO has developed a global system which will harmonize the various systems in use in different States and replace sole reliance on runway friction measuring devices for operational use. Based on airplane performance facing various meteorological contaminations, this worldwide system is called Global Reporting Format (GRF) and will be mandatory by November 05th, 2020.
A fundamental change in the new reporting system is the introduction of runway condition code (RWYCC). Based on all other information available, this initial RWYCC can be downgraded or upgraded.
The revised scale GOOD, GOOD TO MEDIUM, MEDIUM, MEDIUM TO POOR, POOR and LESS THAN POOR shown in the SNOWTAMS will be the same used by the flight crew to characterize perceived braking action and lateral control of the aeroplane during landing roll. RWYCCs 0 through 5 are mapped to this terminology in the runway condition assessment matrix (RCAM)and describe a consistent runway surface condition in relation to its effect on aircraft braking performance and lateral control.