NTSB rules out excess voltage as cause of battery fire in JAL 787 jet
Source: Agencies |
January 21, 2013, Monday
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THE US National Transportation Safety Board ruled out yesterday excess voltage as the cause of a battery fire on the Boeing 787 Dreamliner jet operated by Japan Airlines Co 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, 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.
US investigators have examined the lithium-ion battery that powered the APU, where the battery fire started in the JAL plane, as well as several other components removed from the airplane, including wire bundles and battery management circuit boards, the NTSB statement said.
Japan Transport Safety Board said it was aware of the NTSB report and would consider the US statement in its probe.
"There's nothing more I can add at this point as we still haven't started our investigation into the battery here," JTSB inspector Hideyo Kosugi said.
"The NTSB's investigation started earlier. We still haven't taken X-rays or CT-scans of the battery. In our case, both the battery and the surrounding systems are still stored in (Tokyo's) Haneda (Airport) as the third party organization where the Japanese investigation would take place still has not been chosen."
The US investigators will convene in Arizona tomorrow to test the battery charger and download non-volatile memory from the APU controller, the NTSB said.
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, 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.
US investigators have examined the lithium-ion battery that powered the APU, where the battery fire started in the JAL plane, as well as several other components removed from the airplane, including wire bundles and battery management circuit boards, the NTSB statement said.
Japan Transport Safety Board said it was aware of the NTSB report and would consider the US statement in its probe.
"There's nothing more I can add at this point as we still haven't started our investigation into the battery here," JTSB inspector Hideyo Kosugi said.
"The NTSB's investigation started earlier. We still haven't taken X-rays or CT-scans of the battery. In our case, both the battery and the surrounding systems are still stored in (Tokyo's) Haneda (Airport) as the third party organization where the Japanese investigation would take place still has not been chosen."
The US investigators will convene in Arizona tomorrow to test the battery charger and download non-volatile memory from the APU controller, the NTSB said.
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