The Chicago Tribune reports:
Japan: overcharging unlikely cause of Dreamliner woes
TOKYO/WASHINGTON (Reuters) - Japanese regulators have joined their U.S. counterparts in all but ruling out overcharged batteries as the cause of recent fires on the Boeing Co 787 Dreamliner, which has now been grounded for a week worldwide.
Solving the battery issue has become the primary focus of the investigation, but with excess voltage more or less off the table, investigators are still hunting for a possible cause.
Last weekend the U.S. National Transportation Safety Board said the fire on a Japan Airlines Co Ltd 787 in Boston was not due to excess voltage, and on Wednesday, Japanese officials all but ruled it out for the incident on an All Nippon Airways Co Ltd plane there.
"On the surface, it appears there was no overcharging," said Norihiro Goto, chairman of the Japan Transport Safety Board, at a media briefing.