Wet Ice
Surface friction measurement is a very inexact science, we don't use it at all for performance calculations. Only the type of contaminant is considered relevant and that is what we use. A report of slush on top of ice is, in effect, WET ICE. Airbus describes this:
"Wet ice: when the ice on a runway melts, or there are loose/fluid contaminants on top of the ice, the ice is referred to as "wet ice". When there is wet ice on a runway, braking and directional control are difficult or not possible, because the runway surface is very slippery"
Therefore, don't operate on runways covered with such a contaminant as the actual braking action will probably be NIL !
On the other hand, ICE which is cold and dry is acceptable, provided performance is calculated using POOR as the related performance level.
Last edited by Nightstop; 15th Dec 2015 at 10:56.
Reason: Dry ice added