Our Airline defines this a little differently (USA - jet operator).
Freezing rain is a description of a form of precip. and as such, does not prohibit flight.
HOWEVER - Severe icing is a "rate of accumulation" and is considered severe wx. Dispatch into severe wx conditions is prohibited.
Freezing rain may, or may not be severe icing, depending on the severity of the conditions.
So - you are dispatched to an airport forcasting freezing rain at the ETA - Legal???
Yes - provided you have a suitable alternate and do not operate in severe icing.
Clear as mud
