Experts said the investigation into why China Eastern Airlines flight MU5735 nosedived to the ground in China last month could gain key clues within days from the jet’s black boxes sent to the U.S.

Neil Campbell, a retired air-safety investigator at the Australian Transport Safety Bureau, told Bloomberg, “I’d expect within a week the investigation team would have the information.”

Campbell, who worked on the Boeing 737 Max disaster in Indonesia in 2018, added, “For an accident like this, the recorders are critical.”

Mike Poole, chief executive officer of Ottawa-based Plane Sciences, which helps countries develop air-accident investigation capabilities, said that the black box analysis results could take two weeks.

Poole said he has never seen a case in which 100% of the data was lost because of the force of a crash. However, he added that it would take time to download it, transform it into helpful information, and examine the details correctly.

Black boxes include two flight recorders—the cockpit voice recorder and the flight recorder. They are built to withstand high-speed impact.

They remain the key points to solving the mystery surrounding the Boeing 737 flight that crashed into a hillside in Guangxi province en route from Kunming to Guangzhou.

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