oneworld airline S7 Siberian Airlines flight 5220 from Magadan to Novosibirsk declared a mayday while climbing out on departure ” due to unreliable airspeed and related problems with autopilot and autothrust.”
The Airbus A321 had 192 passengers and 7 crew on board and tried to return to Magadan twice but severe icing prevented them from doing so. They flew four and a half hours to divert to Irkutsk.