B763, en-route, south southwest of Seoul, South Korea, 2021

B763, en-route, south southwest of Seoul, South Korea, 2021

Summary

On 28 May 2021, a Boeing 767-300 climbing over central South Korea with extensive cloud, including embedded cumulonimbus, and near an active transverse jetstream axis below the intended cruise altitude encountered severe turbulence as it re-entered clouds on a resumed climb. A serious injury occurred to one of the cabin crew. She was unable to return to her crew seat and secure herself because of the flight crew’s short notice that turbulence risk would increase from moderate to severe. Opportunities for further improvement in both aircrew turbulence risk prevention procedures and pilots’ turbulence risk response training were identified.

Description

On 28 May 2021, a Boeing 767-300 (HL7528) operated by Asiana Airlines on a scheduled domestic passenger flight from Seoul Gimpo to Jeju as OZ8913 encountered turbulence during the climb. A member of the cabin crew, who had released her safety harness to deal with a passenger in the adjacent toilet, was seriously injured when severe turbulence occurred. The passenger had not responded to an instruction to return to his seat when the seat belt signs were on.

Investigation

A Serious Incident Investigation was carried out by the Korean Aviation and Railway Accident Investigation Board (ARAIB) based on relevant data from the flight data recorder (FDR). Relevant data on the cockpit voice recorder (CVR) was overwritten when it was not isolated after the occurrence. Recorded communications between the flight crew and the airline’s OCC (Operations Control Centre) and relevant actual and forecast meteorological data were available.

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