On 7 November 2016, severe airframe vibrations occurred to an Avro RJ-100 which, following ground de icing, was accelerating in the climb a few minutes after departing from Gothenburg. The crew were able to stop the vibrations by reducing speed but they declared an emergency and returned to land where significant quantities of ice were found and considered to have been the cause of the vibrations. The Investigation concluded that the failure of the de icing operation in this case had multiple origins which were unlikely to be location specific and generic safety recommendations were therefore made.