Originally Posted by
renard
It's approaches and departures in freezing rain and freezing drizzle that are prohibited.
It depends. most de/anti icing devices will be able to protect you in -FZRA as well as most de/anti icing fluids will allow you some holdover time in this condition. It is often the case in northern Europe in winter time. Different story for moderate or heavy FZRA where airplane protective devices for approaches and fluids for departure might not suffice to grant you the required protection. The majority of anti icing fluids have no holdover guidelines for moderate FZRA and higher.