Air safety officials probe 787 battery maker

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US and Japanese aviation safety officials are investigating the company which makes the batteries for Boeing's troubled Dreamliner aircraft, the global fleet of which has been grounded following a series of safety scares.

According to Reuters news agency a spokesman for GS Yuasa Corporation said investigators from the US Federal Aviation Administration (FAA) and Japan's Civil Avation Bureau (CAB) were at the company's offices in Kyoto, where it makes airplane batteries.

The spokesman said the company was "fully co-operating" with FAA and CAB officials.

Boeing halted deliveries of its lightweight 787 - dubbed 'the plastic plane', thanks to its near-50% carbon composite makeup - after a problem with a lithium-ion battery forced an All Nippon Airways 787 to make an emergency landing last week.

The incident was the latest in a series of recent scares that have raised concerns about the safety of the technologically advanced airliner.

Reuters reported that US officials were looking at the battery's charger and the jet's auxilliary power unit.