Regulatory and company oversight as well as certification issues were some of the causes that contributed to the lithium-ion battery fire that grounded Boeing's 787 Dreamliners last year, according to the final report from the National Transportation Safety Board. Other causes include design and testing problems on both Boeing's part and that of the battery maker, Yuasa.

Overcharging or environmental issues were ruled out as likely factors for the internal battery short circuit that triggered the fire, however no specific issue was found to be to blame. The most likely culprits, according to the report, were contamination or a battery manufacturing process that allowed such defects coupled with a failure on Boeing's part to understand how the batteries could fail.

By: DocMemory
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