Japan 787 probe finds thermal runaway in battery

Japan 787 probe finds thermal runaway in battery

Credit: AFP/Getty Images

A Boeing 787 Dreamliner operated by All Nippon Airways (ANA) sits on the tarmac after an emergency landing at Takamatsu Airpirt in Takamatsu, west of Japan, on January 16, 2013. Japan's two biggest airlines on January 16 grounded all their Dreamliners in the most serious blow yet to Boeing's troubled next-generation model after an ANA flight was forced into an emergency landing.

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by Associated Press

KING5.com

Posted on February 5, 2013 at 7:42 AM

Updated Tuesday, Feb 5 at 7:43 AM

TOKYO  -- Japan's Transport Safety Board says an investigation into a lithium ion battery aboard a Boeing 787 flight in Japan last month found evidence of the same type of "thermal runaway" seen in a similar incident in Boston.

The board said in a report Tuesday that CAT scans and other analysis found damage to all eight cells in the battery that overheated on an All Nippon Airways 787 on Jan. 16, prompting an emergency landing.

They also found signs of "thermal runaway," a chemical reaction in which rising temperature causes progressively hotter temperatures. U.S. investigators found similar evidence in the battery that caught fire last month on a Japan Airlines 787 parked in Boston.

All 50 Boeing 787s in operation are grounded as regulators and Boeing investigate the problem.

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