Sunday April 20, 2014


question of the week

Survey results are meant for general information only, and are not based on recognised statistical methods.





Home »  News »  Business

Japan probe finds lithium ion battery in 787 operated by ANA was not overcharged


In this Friday, Jan. 18, 2013 photo, a grounded All Nippon Airways' Boeing 787 is parked on the tarmac at Haneda airport in Tokyo. Japan's transport safety agency says a lithium ion battery on a Boeing 787 that overheated during an All Nippon Airways flight earlier this month, prompting an emergency landing, was not overcharged. (AP Photo/Koji Sasahara)

TOKYO - A lithium ion battery on a Boeing 787 that overheated during an All Nippon Airways flight earlier this month experienced a sudden drop in voltage and was not overcharged as previously thought possible, Japan's transport safety agency said Wednesday.

Japan Transport Safety Board chairman Norihiro Goto told reporters the jet's data recorder showed the main battery, used to power many electrical systems on the jet, did not exceed its maximum voltage. That contradicts an earlier assertion by the agency as it investigates with the U.S. Federal Aviation Administration.

All 50 of the 787 Dreamliners that Boeing has delivered to airlines were grounded after the emergency landing by the ANA flight in western Japan on Jan. 16. Boeing has halted deliveries of new planes until it can address the electrical problems.

Goto said the maximum voltage recorded for the battery was 31 volts, which was below its 32 volt limit. But the data also showed a sudden, unexplained drop in the battery's voltage, he said.

Aircraft do not usually use the kind of lithium ion battery chosen for the 787, and investigators are still struggling to figure out what may have gone wrong.

"It's not that it is difficult, but that we are not so familiar with it," Goto said.

The Transport Safety Board said it also will study the aircraft's auxiliary battery and compare data from each.

Investigators from both sides are probing GS Yuasa, the maker of the charred battery, and are examining the battery using CAT scans at a facility of Japan's aerospace agency.

U.S. investigators also said that they found no evidence of overcharging in a battery that ignited on a Japan Airlines Boeing 787 as it sat on the tarmac in Boston's airport earlier this month.


Comments


NOTE: To post a comment in the new commenting system you must have an account with at least one of the following services: Disqus, Facebook, Twitter, Yahoo, OpenID. You may then login using your account credentials for that service. If you do not already have an account you may register a new profile with Disqus by first clicking the "Post as" button and then the link: "Don't have one? Register a new profile".

The Coast Reporter welcomes your opinions and comments. We do not allow personal attacks, offensive language or unsubstantiated allegations. We reserve the right to edit comments for length, style, legality and taste and reproduce them in print, electronic or otherwise. For further information, please contact the editor or publisher, or see our Terms and Conditions.

blog comments powered by Disqus


About Us | Advertising | Contact Us | Sitemap / RSS   Glacier Community Media: www.glaciermedia.ca    © Copyright 2014 Glacier Community Media | User Agreement & Privacy Policy
Business in Vancouver Whistler Question Squamish Chief Powell River Peak Real Estate Weekly My Local Flyers

LOG IN



Lost your password?