'Thermal runaway' signs in 787 battery
Source: Agencies |
February 6, 2013, Wednesday
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Print Edition
Print Edition
AN investigation into a lithium ion battery that overheated on a Boeing 787 flight in Japan last month found evidence of the same type of "thermal runaway" seen in a similar incident in Boston, officials said yesterday.
The Japan Transportation Safety Board said that CAT scans and other analysis found damage to all eight cells in the battery that overheated on the All Nippon Airways 787 on January 16, which prompted an emergency landing and probes by both US and Japanese aviation safety regulators.
They also found signs of short-circuiting and "thermal runaway," a chemical reaction in which rising temperature causes progressively hotter temperatures. US investigators found similar evidence in the battery that caught fire last month on a Japan Airlines 787 parked in Boston.
Photos distributed by the Japanese investigators show severe charring of six of the eight cells in the ANA 787's battery and a frayed and broken earthing wire - meant to minimize the risk of electric shock.
The Japan Transportation Safety Board said that CAT scans and other analysis found damage to all eight cells in the battery that overheated on the All Nippon Airways 787 on January 16, which prompted an emergency landing and probes by both US and Japanese aviation safety regulators.
They also found signs of short-circuiting and "thermal runaway," a chemical reaction in which rising temperature causes progressively hotter temperatures. US investigators found similar evidence in the battery that caught fire last month on a Japan Airlines 787 parked in Boston.
Photos distributed by the Japanese investigators show severe charring of six of the eight cells in the ANA 787's battery and a frayed and broken earthing wire - meant to minimize the risk of electric shock.
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