Boeing 787 battery meltdown cause still unclear, says US safety board
WASHINGTON (AFP) - US safety officials investigating burned batteries on two Boeing 787s said on Tuesday they are not certain what caused the incidents, even as aviation regulators approve Boeing's fix for the problem.
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.
At the end of the first day, Ms Debbie Hersman, chairwoman of the safety board, said they heard new information on the problems.
But she said they still do not know for certain what caused the battery problems in January, which resulted in a fire in one 787 flight and smoke in another.