Neither event should have occurred on the Dreamliner, Deborah Hersman, chairwoman of the NTSB, said last week.
"Our goal is to get to zero deaths because each alcohol-impaired death is preventable, " NTSB Chairman Deborah Hersman said.
Despite sharp questioning from NTSB Chair, Deborah Hersman, both the FAA and Boeing witnesses failed to give satisfactory answers.
Board chairwoman Deborah Hersman said it would be months before the board determines the probable cause of the accident.
"I would not want to categorically say that these batteries are not safe, " said Deborah Hersman, head of the NTSB.
"Most Americans think that we've solved the problem of impaired driving, but in fact, it's still a national epidemic, " NTSB Chairman Deborah Hersman said.
Boeing had estimated a "smoke" event would occur "less than once in 10 million flight hours" with the batteries, Deborah Hersman, the safety board's chairman, said.
The age of the underground lines is less important than whether they are getting adequately maintained, says Deborah Hersman, chair of the safety board, at the hearing.
After all, NTSB chair, Deborah Hersman noted that the FAA approved the 787 for flight because Boeing convinced it the lithium-ion battery would only burn up once every 10 million flight hours.
An initial investigation shows the 1, 111-foot-long bridge collapsed when a tractor-trailer hauling an oversized load hit one of the bridge's overhead tresses, according to Deborah Hersman, chairwoman of the National Transportation Safety Board, which is investigating the incident.
"The failure rate was higher than predicted as part of the certification process and the possibility that a short circuit in a single cell could propagate to adjacent cells and result in smoke and fire must be reconsidered, " said Deborah Hersman, the head of NTSB.
"We are here to understand why the 787 experienced unexpected battery failures following a design program led by one of the world's leading manufacturers and a certification process that is well-respected throughout the international aviation community, " NTSB's Chairman Deborah Hersman said at the opening of a two-day board hearing.
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