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 on Monday 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 would inspect Kanto Aircraft Instrument Co on Monday as part of the ongoing investigation. It makes a system that monitors voltage, charging and temperature of the lithium-ion batteries.
All 50 of the Boeing 787s in use around the world are grounded after one of the jets operated by All Nippon Airways made an emergency landing in Japan earlier this month when its main battery overheated. Earlier in January, a battery in a Japan Airlines 787 caught fire while parked at Boston's Logan International Airport.
GS Yuasa shares jumped on the news it was no longer being investigated.
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.
Deliveries of the jet dubbed the Dreamliner were three years behind schedule because of manufacturing delays. Much of the aircraft is made by outside manufacturers, many of them major Japanese companies.
It is the first jet to make wide use of lithium-ion batteries, the kind usually found in laptops and other gadgets. They are prone to overheating and require additional systems to avoid fires.
The 787 is the first airliner made mostly from lightweight composite materials that boost fuel efficiency. It also relies on electronic systems rather than hydraulic or mechanical systems to a greater degree than any other airliner.
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