Probe shifts to maker of monitoring system
Source: Agencies |
January 29, 2013, Tuesday
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Print Edition
Print Edition
THE joint US and Japanese investigation into the Boeing 787's battery problems has shifted from the battery-maker to the manufacturer of a monitoring system.
Japan transport ministry official Shigeru Takano said the probe into battery-maker GS Yuasa was over for now as no evidence was found it was the source of the problems.
Ministry officials said they will inspect Kanto Aircraft Instrument Co as part of the ongoing investigation. It makes a system that monitors voltage, charging and temperature of the lithium-ion batteries.
GS Yuasa shares jumped on the news it is no longer being investigated, gaining nearly 5 percent in Tokyo trading. The issue had plunged 12 percent after the battery problems surfaced in Japan.
Officials stopped short of saying that Kanto's monitoring system was under any special scrutiny, saying it was part of an ongoing investigation. "We are looking into affiliated parts makers," Takano said. "We are looking into possibilities."
Last week, US federal investigators said the JAL battery that caught fire showed evidence of short-circuiting and a chemical reaction known as "thermal runaway," in which an increase in temperature causes progressively hotter temperatures. It's not clear to investigators which came first, the short-circuiting or the thermal runaway.
Japan transport ministry official Shigeru Takano said the probe into battery-maker GS Yuasa was over for now as no evidence was found it was the source of the problems.
Ministry officials said they will inspect Kanto Aircraft Instrument Co as part of the ongoing investigation. It makes a system that monitors voltage, charging and temperature of the lithium-ion batteries.
GS Yuasa shares jumped on the news it is no longer being investigated, gaining nearly 5 percent in Tokyo trading. The issue had plunged 12 percent after the battery problems surfaced in Japan.
Officials stopped short of saying that Kanto's monitoring system was under any special scrutiny, saying it was part of an ongoing investigation. "We are looking into affiliated parts makers," Takano said. "We are looking into possibilities."
Last week, US federal investigators said the JAL battery that caught fire showed evidence of short-circuiting and a chemical reaction known as "thermal runaway," in which an increase in temperature causes progressively hotter temperatures. It's not clear to investigators which came first, the short-circuiting or the thermal runaway.
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