东航失事客机MU5735的黑匣子已被送往美国读取数据

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Both black boxes from a passenger plane crash in southern China last month that killed 132 people are being analyzed by U.S. experts at a government lab in Washington, D.C.

The National Transportation Safety Board(NTSB) said it is helping its Chinese counterparts download information from the flight data recorder. The American agency said it was doing the same for the cockpit(驾驶舱) voice recorder(CVR). Both may have been damaged by the impact of the crash. If the information on them can be recovered, it could tell why the China Eastern Boeing 737-800 went into a sudden nosedive from about 8,800 meters (29,000 feet) over a mountainous region on March 21.

The crash left a 20-meter-deep huge hole in a mountainside, destroyed the plane completely and set off a fire in the surrounding forest. More than 49,000 pieces of plane debris were found. It took 2 days to find the CVR, which would pick up voices and other sounds from microphones worn by the pilots and another stationed over their heads. Another 4 days later searchers recovered the flight data recorder, which constantly records information of speed, altitude and the performance of key systems on the aircraft. And it was buried 1.5 meters underground.

U.S. accident investigators arrived in China to assist the investigation by the Civil Aviation Administration of China(中国民用航空总局). The NTSB team is taking part because the plane was manufactured in the United States. Chinese officials have said a preliminary(初步的) investigation report would be completed within 30 days of the crash.

The 737-800 has an excellent safety record and the Chinese airline industry has had relatively few mishaps in recent years. Before last month’s accident, the last fatal crash of a Chinese airliner occurred in August 2010, when an Embraer ERJ 190-100 operated by Henan Airlines hit the ground short of the runway in the northeastern city of Yichun and caught fire, killing 44 people. Investigators blamed pilot error.

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