Evidence shows Jeju Air pilots shut off less-damaged engine before crash, source says
The source said the evidence, including the cockpit voice recorder, computer data and a physical engine switch found in the wreckage showed pilots shut off the left engine instead of the right engine when taking emergency steps after a bird strike just before it was scheduled to land.
"The investigation team has clear evidence and backup data, so its finding will not change," the source told Reuters on condition of anonymity because investigators have not released an official report including this evidence.
A government source said examinations of the plane's recovered engines found that no defects had been present before the bird strike and crash.
The December 29 crash of the Boeing (BA.N), opens new tab 737-800 jet at Muan Airport killed all but two of the 181 passengers and crew members on board and was the deadliest air disaster on South Korean soil.
Investigators told victims' family members at a briefing on Saturday that the right engine had been more severely damaged by a bird strike than the left, and there was circumstantial evidence that pilots had turned off the less-damaged left engine, according to a third source who was at the briefing.
South Korean media outlets including MBN and Yonhap reported that information on Saturday and Sunday.
South Korea's Aviation and Railway Accident Investigation Board (ARAIB), which is leading the investigation, did not respond immediately to a request for comment.
Boeing referred questions about the crash to ARAIB. Engine maker CFM International, a joint venture between GE (GE.N), opens new tab and France's Safran (SAF.PA), opens new tab, did not immediately respond to a request for comment.
Jeju Air said it was actively cooperating with the ARAIB's investigation and awaiting the official announcement of the results.
Most air crashes are caused by multiple factors, and under international rules, a final report is expected within a year of an accident.
A preliminary report released in January said duck remains were found in both engines of the Jeju Air plane after the flight from Bangkok crashed at Muan Airport, but did not give details about the extent of remains or damage found in each engine.
South Korea's investigation body on Saturday cancelled a planned release to media of an update on what is known so far about the engines.
Families of the crash victims were briefed on the report ahead of its planned release, but objected to its publication, saying that it appeared to apportion blame to the pilots without exploring other contributing factors, lawyers representing the families said.
The Jeju Air flight overshot Muan Airport's runway as it made an emergency belly landing and crashed into an embankment containing navigation equipment, leading to a fire and partial explosion.
Representatives of victims' families and the Jeju Air pilots' union said over the weekend that the investigation needs to also focus on the embankment, which aviation experts have said likely contributed to the high death toll.
The Jeju Air pilots' union said the ARAIB was "misleading the public" by suggesting there was no problem with the left engine given traces of bird remains were found in both engines.
The union accused the ARAIB of trying to make pilots "scapegoats" by failing to provide scientific and technological grounds that the plane could have landed safely with only the left engine turned on.
Air accidents are complex incidents that occur due to a number of contributing factors, and investigators have not produced evidence so far to support the implication that the accident was a result of pilot error, the union said.
Investigators are so far "silent about organisational responsibility", the union said.
A body representing bereaved families said in a statement there were some phrases related to the cause of the accident in the planned press release that could be interpreted as if a final conclusion had been reached, and all facts surrounding the incident must be clarified.
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