The U.S. National Transportation Safety Board ruled out on Sunday excess voltage as the cause of a battery fire on the Boeing Co (BA.N) 787 Dreamliner jet operated by Japan Airlines Co (JAL) (9201.T) at Boston airport this month.
Last week, governments across the world grounded the Dreamliner while Boeing halted deliveries after a problem with a lithium-ion battery on a second 787 plane, flown by All Nippon Airways Co (ANA) (9202.T), forced the aircraft to make an emergency landing in western Japan.
"Examination of the flight recorder data from the JAL B-787 airplane indicates that the APU (auxiliary power unit) battery did not exceed its designed voltage of 32 volts," the NTSB said in a statement forwarded by a Boeing Japan representative.
On Friday, a Japanese safety official told reporters that excessive electricity might have overheated the battery in the ANA-owned Dreamliner which was forced to make the emergency landing at Japan's Takamatsu airport last week.
20/01/13 James Topham and Antoni Slodkowski/Reuters.com
