US safety officials investigating burned batteries on two Boeing 787s said Tuesday they are not certain what caused the incidents, even as aviation regulators approve Boeing's fix for the problem.
The National Transportation Safety Board holds an investigative hearing into the Boeing 787 battery fire April 23, 2013 in Washington, DC. The US safety officials investigating a battery fire on a Boeing 787 opened a two-day public hearing Tuesday to examine how the pioneering lithium-ion battery system was designed and approved for use.
Four days after the Federal Aviation Administration cleared the 787 to return to flight, the National Transportation Safety Board opened a two-day public hearing to examine how the pioneering lithium-ion battery system was designed and approved for use.
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