NPR : News

Japan: Probe Of Battery Fire On Boeing 787 Finds Improper Wiring

Two reports on troubles with lithium ion batteries aboard Boeing's 787 Dreamliner:

In Japan, where a battery on an All Nippon Airlines 787 overheated and began smoking on Jan. 16, forcing the plane to make an emergency landing, the Transport Ministry released a report Wednesday saying it found that the battery in question had been improperly wired.

The Associated Press, citing the Transport Ministry report, said the ANA 787's auxiliary power unit was incorrectly connected to the main battery that overheated. The incident prompted the U.S. Federal Aviation Administration and authorities in other countries to ground 787s worldwide.

According to the AP, on the ANA flight, the Japanese Transport Ministry noted:

Flickering of the plane's tail and wing lights after it landed and the fact the main battery was switched off led the investigators to conclude there was an abnormal current traveling from the APU due to miswiring.

However, the ministry said it still needed further investigation to determine exactly what caused the main battery to overheat.

In another report, the Reuters news agency, citing an unnamed source said to be "familiar with [Boeing's] plans," said the aircraft maker had determined that the solution to the overheating problem was to increase the gaps between the battery's individual cells, but the report gave no other details.

The Reuters story also quotes Kiyoshi Kanamura, a professor at Tokyo Metropolitan University, who has been involved in battery research, as saying that the "logical solution" for the battery problem is to install ceramic plates between the cells and add a vent to the battery box, presumably to dissipate the excess heat.

The Dreamliner is a revolutionary airliner that is the first to make extensive use of lighter-weight lithium ion batteries, which are more prone to overheating and catching fire.

Copyright 2013 NPR. To see more, visit


From A Weirdo Nerd To A Guy Who Plays One On TV

NPR's Ari Shapiro talks with the actor Rainn Wilson about his new memoir, The Bassoon King: My Life in Art, Faith, and Idiocy.

How Long Can Florida's Citrus Industry Survive?

The USDA recently stunned growers when it projected the smallest orange harvest for Florida in more than 50 years. The culprit: A tiny insect that's killing off the state's trees — and industry.

Snapshots 2016: Trump's Message Resonates With A Master Cabinet Maker

From time to time during this election season we'll be introducing you to ordinary people that our reporters meet out on the campaign trail. Today: a snapshot from a Donald Trump rally in New Hampshire.

Someday A Helicopter Drone May Fly Over Mars And Help A Rover

NASA is building a 2-pound helicopter drone that would help guide the vehicle on the Red Planet's surface. That way, the rover wouldn't need to wander as much to find its way around.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.