You can now read 10 articles in a month for free on BostonGlobe.com. Read as much as you want anywhere and anytime for just 99¢.

The Boston Globe

Business

No cause yet in Boeing 787 battery fire

NTSB chair says signs of short circuit found

WASHINGTON — The National Transportation Safety Board indicated Thursday that an investigation into the failure of lithium-ion batteries aboard two Boeing 787 planes is still far from determining a cause.

Deborah A.P. Hersman, chairwoman of the board, said a battery that caught fire in a 787 parked at a gate at Logan International Airport in Boston showed signs of short-circuiting and of a ‘‘thermal runaway,’’ in which a chemical reaction begins to overheat the battery and speeds up as the temperature increases. But Hersman described these as ‘‘symptoms,’’ and pointedly declined to say whether those problems were the cause of the incident, which, combined with a similar event in Japan, has led to the grounding of all 50 of the planes in service.

Loading comments...

You have reached the limit of 10 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week