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

Camano artist mixes flask, paintings for successful cocktail

Art flasks prove popular as bachelorette gifts, birthday presents and wedding favors.

Small retailers aim for emotional ties big chains may lack

“Put yourself into the community more and the money will come back to you.”

A look at what some stores have planned for Black Friday

With unemployment low, stores are hoping customers are in a mood to shop.

Boeing bolsters team for potential 797 with leading engineer

Terry Beezhold has been chief project engineer for the 777X program.

Uber paid off their hackers — they’re far from the only ones

“More and more companies have their own Bitcoin wallets for such cases.”

Airline defendants to pay $95 million in 9/11 settlement

The litigation claimed that security lapses led the planes to be hijacked in the Sept. 11 attacks.

Trump SoHo to shed ‘Trump’ amid reports of sagging business

The president’s company said it would have no comment beyond its news release announcing the move.

Uber reveals cover-up of hack affecting 57M riders, drivers

Uber acknowledges paying the hackers $100,000 to destroy the stolen information a year ago.

Mountlake Terrace-based 1st Security Bank wasn’t traded publicly during the recession, but it has seen a steady growth since the recession. (Jim Davis / HBJ)
How stocks in local banks fared since the recession

Every bank was hit hard during the recession, but most have bounced back in a big way.

Most Read