The plane crashed on October 16 during a heavy storm as it approached Pakse Airport in southern Laos. It struck a riverbank before plowing into the swift-running Mekong, killing 49 people.
The digital flight data recorder was recovered yesterday, said Yakua Lopangkao, director-general of Laos' Department of Civil Aviation. He said today that the divers were able to see the cockpit voice recorder but they have not been able to recover it.
A cockpit voice recorder contains the conversations in the cockpit, while a flight data recorder logs technical data such as the plane's altitude, speed and route.
Yakua said both devices commonly known as black boxes are needed for a thorough investigation.
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"To be able to investigate the cause of the crash whether it was because of technical errors or pilot errors we need to retrieve the other black box, too," he said by phone on yesterday. "Once we recover it, the investigation process can speed up."
The airline said Wednesday that 47 bodies had been found and 43 had been identified.