A co-pilot smoking an e-cigarette on an Air China flight caused the plane to start a rapid emergency descent, investigators have said. They say he tried to hide the fact that he was smoking but accidentally shut off the air-conditioning, causing oxygen levels to fall. The crew on Tuesday's flight from Hong Kong to the city of Dalian released oxygen masks and brought the plane more than 6,500m (21,000ft) lower. It later returned to cruising altitude.
An initial probe by China's Civil Aviation Administration in China has shown that the co-pilot tried to turn off a fan to stop smoke reaching the passenger cabin without telling the captain, but turned off the air-conditioning unit instead. Passengers say they were told to fasten their seat belts as the plane had to descend.
Authorities are reportedly investigating the cause "in greater detail", examining both the flight data recorder and the cockpit voice recorder to determine precisely what caused the incident. Chinese flight regulations prohibit all flight crew from smoking,and banned passengers from using e-cigarettes on board in 2006.
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