Originally Posted by
labbats
They use wet numbers for landing data when MU reports are given.
I have argued against this and was told that even though the field was being plowed and snow was constant that wet numbers applied. This came from several sources.
If you aren't comfortable then don't go.
With that said, it's extremely difficult at any airline to determine runway conditions. Even the aerodata performance book lists specifications for different contaminants. Yet they are measurements in inches. I have never been to an airport that reported contaminant depth. Ultimately it's up to the PIC to determine.