In this Jan. 24, 2013, file photo, National Transportation Safety Board Chairman Deborah Hersman points to a reporter during a news conference in Washington. The use of lithium ion batteries to power aircraft systems isn't necessarily unsafe despite a battery fire in one Boeing 787 Dreamliner and smoke in another, but manufacturers need to build in reliable safeguards, Hersman said Wednesday, Feb. 6, 2013. (AP Photo/Manuel Balce Ceneta, File)
National Transportation Safety Board Chairman Hersman says Thursday that Boeing’s safety testing of the batteries before they won approval from the Federal Aviation Administration showed that a short-circuit in one of the battery’s eight cells could be retained in that cell.
But the NTSB’s investigation of a Jan. 7 battery fire in a Japan Airlines 787 parked at Boston’s Logan International Airport shows the short-circuiting quickly spread to the battery’s other cells, creating a cascading, uncontrolled chemical reaction that sparked the fire.
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