Accident Overview
On May 1, 2020, at 12:06 local time, a Sikorsky S-76B helicopter registered as HL9646, operated by Sejin Aviation Co., Ltd., crashed approximately 400 meters south of Jirisan Cheonwangbong Peak in Sancheong-gun, Gyeongsangnam-do, South Korea. The aircraft was conducting a mountain rescue operation at the time of the accident.
Aircraft and Operator
The accident helicopter was a Sikorsky S-76B with registration HL9646. It was operated by Sejin Aviation Co., Ltd. The aircraft was configured for rescue operations and was carrying a pilot, co-pilot, mechanic, rescue worker, and flight paramedic. Detailed information about the crew is documented in the report sections on personal information.
Investigation
The Aviation and Railway Accident Investigation Board (ARAIB) of the Republic of Korea conducted the investigation, in accordance with the Aviation and Railway Accident Investigation Act and Annex 13 to the Convention on International Civil Aviation. The investigation included examination of the wreckage, engines, flight recorders, witness video, maintenance records, and operational procedures. The cockpit voice recorder (CVR) and video footage from a witness were analyzed. Engine examinations included external inspections, borescope inspections, test cell runs, and disassembly inspections of both engines. The report also covers meteorological information, weight and balance, hoist and rescue stretcher details, crew resource management during rescue hoisting, and hovering performance in mountainous terrain. The investigation's findings are detailed in the report's factual information and analysis sections.
Conclusion
The report presents investigation results, but no probable cause is explicitly stated in the available excerpt.