On October 10, 2010, Korean Air Boeing 747-400 registered in Korea as HL7489, experienced an uncontained release of turbine material from the No. 3 engine, a Pratt & Whitney PW4056 engine. About 40 minutes after takeoff, the crew observed engine vibrations and oi pressure indications followed by high exhaust gas temperature. The crew shut down the No. 3 engine and returned to Seoul without further incident. The examination of the engine after landing showed the exhaust sleeve was missing and there was a large hole in the low pressure turbine case that revealed extensive internal damage to the engine. The airplane was operating as Korean Air flight KE023 from Seoul to San Francisco, California. There were no reported injuries to the passengers or crew.

The incident is being investigated by the Korean Aviation & Railway Accident Investigation Board (ARAIB). The NTSB has designated a U.S. Accredited Representative to the ARAIB's investigation in
accordance with the provisions of the International Civil Aviation Organization (ICAO) Annex 13 as
the state of manufacture of the airplane and engine.
All inquiries should be directed to:
Aviation and Railway Accident Investigation Board
Ministry of Land, Transport and Maritime Affairs
281, Gonghang-Dong
Gangseo-gu, Seoul, 157-815
Republic of Korea
Website: http://www.araib.go.kr

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