B773, en-route, Bering Sea, 2013

B773, en-route, Bering Sea, 2013

Summary

On 2 July 2013, a Korean Air Lines Boeing 777-300 experienced an uncommanded in-flight shutdown of one of its GE90-115B engines while crossing the Bering Sea. The crew made an uneventful diversion to Anadyr Russia. The Korean Aviation and Railway Accident Investigation Board (ARAIB) delegated investigative duties of this event to the National Transportation Safety Board (NTSB) which identified the cause of the failure as a manufacturing process deficiency which could affect nearly 200 similar engines.

Description

On 2 July 2013, a Boeing 777-300ER (HL8275) being operated by Korean Air Lines, on a scheduled passenger flight from Chicago O’Hare to Seoul Incheon in day Visual Meteorological Conditions (VMC) experienced a failure and uncommanded in flight shut down of its No 1 GE90-115B engine whilst in the cruise at FL340. The crew diverted to Anadyr, Russia where an uneventful single engine landing was carried out.

Investigation

Delegation of the Investigation was initially requested by the Korean Aviation and Railway Accident Investigation Board (ARAIB) but since the failed engine was of US design and manufacture, the National Transportation Safety Board (National Transportation Safety Board (USA) (NTSB))was then asked to undertake the Investigation.

It was established that the first indication of a problem with the operation of the No 1 GE90-115B engine was a loss of N2 speed. It was found that the engine had accumulated only 239 hours 38 cycles since new (CSN).

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