Rescuers conduct search and rescue work at the site of a China Eastern Airlines Boeing 737 on March 26.
Rescuers conduct search and rescue work at the site of a China Eastern Airlines Boeing 737 on March 26.
US accident investigators have flown to China to help authorities there probe last month’s deadly crash of a Boeing jetliner.

The National Transportation Safety Board said the team departed for China on Friday to participate in the Civil Aviation Administration of China’s investigation of the crash of a China Eastern Airlines Boeing 737-800 in which all 132 people on board were killed.

As part of that assistance, the plane’s cockpit voice recorder is being downloaded and analyzed at a US lab in Washington, federal officials said Friday.

Investigators hope the recording will explain why the plane went into a nosedive from about 8,800 meters (29,000 feet) over a mountainous region in southeastern China.

The impact caused by the crash in China created a 20-meter- (65-foot-) deep crater, set off a fire in the surrounding forest, and smashed the plane into small parts scattered over a wide area, some of them buried underground. More than 49,000 pieces of debris have been recovered, along with some human remains and personal items.

A Chinese aviation safety official said a preliminary investigation report would be completed within 30 days of the March 21 crash.