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Source: Evidence suggests Jeju Air pilots turned off the less-damaged engines before crash.

Sources familiar with the investigation said Monday that the South Korean-led probe into the fatal plane crash of Jeju Air in December had "clear proof" that the pilots turned off the engine less damaged after a bird struck.

Source: The evidence, which included the cockpit voice recording, computer data, and a physical switch found in wreckage, showed that pilots took emergency measures after a bird struck the aircraft just before the scheduled landing.

The source, who spoke on condition of anonymity as investigators had not yet released an official report that included this evidence, said: "The investigation team's findings will not change."

According to a government source, the recovered engines of the plane were examined and found to be in perfect condition.

The crash of a Boeing 737-800 at Muan Airport on December 29, which killed all but 2 of the 181 passengers, crew and other people on board was the worst air disaster to ever occur on South Korean soil.

At a Saturday briefing, investigators informed the family members of the victims that the right engine was more severely damaged than the left. According to a third person who attended the briefing, there was circumstantial proof that the pilots had shut off the left engine which was less badly damaged.

On Saturday and Sunday, South Korean media outlets such as MBN and Yonhap published this information.

The Aviation and Railway Accident Investigation Board of South Korea (ARAIB), the organization that is leading this investigation, has not responded to a comment request immediately.

Boeing referred all questions regarding the crash to ARAIB. CFM International, a joint-venture between GE France and Safran, the engine maker, has not responded to a comment request.

Jeju Air stated that it is actively cooperating in the ARAIB investigation and awaits the official announcement of results.

The majority of air crashes have multiple causes, and international standards require a final report within one year after an accident.

In a preliminary report published in January, it was reported that duck remains had been found in both engines after the plane crashed from Bangkok at Muan Airport. However, the report did not provide details on the extent of damage or remains found in each engine.

OBJECTIONS OF VICTIMS’ FAMILIES

The South Korean investigation body cancelled on Saturday a planned media release of what was known about the engines.

Lawyers representing the families of crash victims informed them of the report before its release. However, they objected, saying it seemed to assign blame to the pilots, without considering other contributing factors.

Jeju Air's flight made an emergency belly-landing and overshot Muan Airport runway. It crashed into an embankment that contained navigation equipment and caused a partial explosion and fire.

Over the weekend, representatives of the families of the victims and the Jeju Air Pilots' Union said that the investigation should also focus on the embankment which aviation experts say likely contributed to the large death toll.

The Jeju Air Pilots' Union said that the ARAIB "misled the public" when it suggested there was no issue with the left-hand engine, given the fact that bird remains had been found in both engines.

The union claimed that ARAIB was trying to "scapegoat" the pilots by not providing scientific and technical evidence to support the claim that the plane would have landed with the left engine only turned on.

The union stated that air accidents are complex events that can be caused by a variety of factors. Investigators have yet to produce evidence to support that the accident occurred as a result pilot error.

The union claimed that investigators have been "silent" about the organisational responsibility.

In a statement, a group representing bereaved family members said that certain phrases in the planned release could be misinterpreted as concluding the cause of accident. All facts regarding the incident should be clarified. (Reporting and editing by Jamie Freed; Additional reporting by Joyce Lee, Hyunjoo Ji and Lisa Barrington)

(source: Reuters)