Japan’s 787 probe finds battery short-circuiting

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 Tuesday.

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 Jan. 16, which prompted an emergency landing and probes by both U.S. 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. U.S. 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.

All 50 Boeing 787s in operation are grounded as regulators and Boeing investigate the problem. The Japanese probe is focusing on flight data records and on the charger and other electrical systems connected to the damaged battery.

Lithium ion batteries are more susceptible to catching fire when they overheat or to short-circuit than other types of batteries. Boeing built in safeguards to gain safety certification for use of the relatively light and powerful batteries to power various electrical systems on the 787, the world’s first airliner made mostly from lightweight composite materials.

Investigators earlier said they found no evidence of quality problems with production of the 787’s batteries by Kyoto, Japan-based, GS Yuasa.

More in Herald Business Journal

Happy accident leads Edmonds couple to make Hunniwater drink

The latest line of energy drinks by Karin and Eric… Continue reading

Single payer is no panacea for our costly health care system

We must address the cost of health care before designing an insurance system.

Voters are on the sidelines as the port fills a vacant seat

Troy McClelland resigned from the Port of Everett commission too late for an election before 2019.

Career Fair planned next week at Tulalip Resort Casino

The Snohomish County Career Fair is planned from 10 a.m. to 2… Continue reading

American Farmland Trust president to speak in Mount Vernon

American Farmland Trust President John Piotti plans to give a talk about… Continue reading

In new setback, Uber to lose license to work in London

The company, beset by litany of scandals, was told it was not “fit and proper” to keep operating there.

Not home? Walmart wants to walk in and stock your fridge

The retailer is trying out the service with tech-savvy shoppers who have internet-connected locks.

Trade panel: Cheap imports hurt US solar industry

The ruling raises the possibility of tariffs that could double the price of solar panels.

Agent joins Re/Max in Smokey Point

Dennis Roland joined the Re/Max Elite Smokey Point office. The Navy veteran… Continue reading

Most Read