RJ1H, vicinity Gothenburg Sweden, 2016

RJ1H, vicinity Gothenburg Sweden, 2016

Summary

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.

Description

On 7 November 2016, an Avro RJ-100 (SE-DSV) being operated by Braathens Regional on a scheduled domestic passenger flight from Gothenburg to Stockholm Bromma as SCW1B had just passed 3,000 feet in the climb to FL 150 in night VMC and was accelerating when airframe vibrations suddenly began. An “emergency” was declared to ATC with a request for an immediate return. Crew actions to reduce speed led to cessation of the vibrations and the air turnback to land on the takeoff runway but in the opposite direction was successfully accomplished with no further vibrations during the approach and crew advising ATC during the final stages of it that operations were now “normal”.

Investigation

An Investigation was carried out by the Swedish Accident Investigation Authority (SHK). No arrangements to protect the FDR data were made after the flight but equivalent QAR data relevant to the event were successfully downloaded. Relevant data on the 30 minute CVR was overwritten after the crew “forgot” to electrically isolate it after the flight.

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