There are no EU regulatory (certification or operational) references to crosswind limits in contaminated conditions.
Some good guidance is given in Canadian documentation (AIP) associated with CRFI. Although the frictional aspects do not apply outside Canada unless the appropriate figures are provided, the crosswind information does provide very sensible information.
See para 1.6.6, Table 3,
AIR - 1.0 GENERAL INFORMATION - Transport Canada Note that
the friction index (CRFI) is not the same as runway friction.
The description of the runway condition can be correlated with the friction index in table 3 by using the contaminant information in Tables 4a & b.
As an example, loose snow up to 25 mm gives a CRFI ranging 0.2 – 0.4 (table 4a), which would relate to a maximum crosswind component of 15 kts (Table 3), but with a lower friction (0.2) in similar conditions, the crosswind component would be greatly reduced.
Note the text with Table 3, in particular “The case where the surface temperature is just at the melting point (i.e. about 0°C) may be an exception, as a water film may form from surface melting, which could induce slippery conditions with CRFIs less than those in Table 4a.”
http://flightsafety.org/files/alar_bn8-7-crosswind.pdf
http://www.nats-uk.ead-it.com/aip/cu...7_P_086_en.pdf
http://www.nlr.nl/id~4382/l~en.pdf
CS-25 AMC 25.1591 gives the performance basis for contaminated operations.