ntsb rules out excess battery voltage in boeing dreamliner incidents

WASHINGTONU. S.
On Sunday, security investigators ruled out that overvoltage was the cause of the battery fire on the Boeing Co 787 Dreamliner operated by Japan Airlines this month (JAL)
They say they are expanding the probe to look at the charger for the battery and the auxiliary power unit for the jet.
Last week, governments around the world stopped flying Dreamliners, while Boeing stopped delivering after the lithium issue.
The ion battery on the second 787 aircraft is owned by All Japan Airlines (ANA)
The plane was forced to land in western Japan.
More and more investigators and Boeing executives are working 24 hours a day to determine what caused these two incidents. S.
The Federal Aviation Administration said the aircraft released flammable chemicals and could cause a fire in the cabin.
There is still no clear answer to the root cause of the battery failure, but the United StatesS.
The statement by the National Transportation Safety Commission eliminated a possible answer from Japanese investigators.
It also highlights the complexity of investigating battery systems, including manufacturers around the world, and may point to design problems with the battery, and the repair time may be longer than replacing a faulty batch of batteries.
\"Check flight recorder data for jal B-
787 aircraft said the APU (
Auxiliary power unit)
\"The design voltage of the battery does not exceed 32 volts,\" NTSB said in a statement released earlier on Sunday . \".
On Friday, a Japanese security official told reporters that too much power could overheat the battery throughout the day.
Last week, the Dreamliner landed at Japan\'s Komatsu airport.
\"NTSB wants to clarify the facts,\" said a source familiar with the investigation . \" He has no right to speak publicly. U. S.
Investigators have checked lithium.
Ion batteries powered for the APU, where the batteries caught fire on the JAL aircraft, and several other components removed from the aircraft, including wiring harnesses and battery management boards, the NTSB statement said.
Investigators will meet on Tuesday in Tucson, Arizona to test and check the battery charger and download the non-
The volatile memory of the APU controller, as well as similar tests planned at the Phoenix plant where APUs was built.
Other components have been sent to Boeing\'s Seattle factory and manufacturer\'s factory in Japan for download or inspection.
Safety aircraft technology, a division of the British Meggitt Plc manufacturing Chargers, said it would fully support the United StatesS. investigation.
The joint technology company that built aircraft-assisted power units is the main supplier of electrical systems on 787 aircraft, and its officials said they would also cooperate with the investigation.
NTSB\'s decision to travel to a safe aircraft facility raises new questions about lithium safety
Ion batteries as the core of the investigation.
While 787 is the most active user of lithium
In commercial aviation, the whole industry is testing ion battery technology, and the FAA has approved the use of ion battery technology on several different aircraft, each of which is subject to \"special conditions\"”“Lithium-
Ion batteries are more vulnerable to internal failures that can cause their own failures
The FAA said in 2006 that it allowed Airbus to use lithium batteries on the a380 as an emerging lighting system.
Securaplane, who first started using the charger in 2004, suffered millions of dollars in losses in November 2006.
The ion battery used for testing exploded and caused a fire, burning an administrative building.
Boeing spokesman Marc Birtel said the investigation into the 2006 fire was later determined to be caused by improper testing devices.
Not the design of the battery.
He declined to comment on the current 787 survey.
After the fire, a former safety aircraft employee named Michael Leon sued the company, claiming he was fired for fear of the difference between the charger and the charger assembly file and the finished charger.
The lawsuit against Leon was later dismissed. The U. S.
Federal Aviation Administration (FAA)
They said on Sunday that they had investigated Leon\'s security complaints in 2008 and 2009, but his conclusion was that his allegations focused on prototypes that were ultimately not used on new light passenger planes
S. FAA spokesman Laura Brown said the review also found that specific printed circuit boards produced by safe aircraft met the requirements of the FAA.
Production of lithium by GS Yuasa, Japan
The ion Battery of the Dreamliner, while the French thalez produces the control system of the battery.
Thales declined to comment.
NTSB said in a statement that the French authorities were also involved in the investigation.
The French security agency did not immediately comment.
The Japan Transportation Safety Board said it was aware of the NTSB report and would consider the US Transportation Safety Board. S.
Stated in the investigation.
The Japanese agency is involved in the investigation of the Boston incident, while NTSB officials are helping the agency investigate the emergency landing in Japan, NTSB said.
Both investigations are ongoing.
Hideyo Kosugi, JTSB inspector, told Reuters: \"There is nothing I can add at this point because we have not started investigating the batteries here . \".
\"The NTSB survey started earlier.
We haven\'t shot X yet-rays or CT-
Scan of the battery.
Kosugi said the batteries and surrounding systems were stored at Tokyo\'s Haneda airport before authorities decided where to conduct a Japanese investigation.
Boeing said Friday it will continue building carbon emissions
Composite 787, but delivery was put on hold before U. S. S.
The Federal Aviation Administration approves and implements a plan to ensure the safety of potentially flammable lithiumion batteries.
In Washington, United StatesS.
Transport Minister Ray Lahoud said the price tag is 787 of $0. 207 billion and will not fly until the regulator \"000% determines\" it is safe.
Japan is by far the largest market of 787, ANA and JAL in 290-seat wide-bodied planes.
Boeing ordered nearly 850 aircraft with the most complex electrical systems on the market.
It is not clear whether the investigation will lead to other airlines.
And military aircraft manufacturers
Reconsider their plans to use lithium.
Lighter and more powerful ion batteries than conventional batteries.
Airbus plans to use similar batteries on its rival 787 A350, which will fly for the first time in the middle of this year.
European executives said last week they will look at the findings from the US. S.
But the survey said they decided to move more slowly than Boeing did in the power system and spread the load more than twice the number of batteries, which would reduce the risk.
Aviation Weekly quoted Tom Williams, head of Airbus projects, as saying that \"fault management\" is the key, and any leaking gas in the A350 battery will be protected by titanium when it is expelled from the aircraft.
The company did not say, as Boeing did, whether it would try to curb lithium fire or focus on curbing it.
Williams told Aviation Weekly that switching from lithium to nickel and cadmium requires a lot of engineering work on space and weight penalties.
Airbus did not immediately comment on the article.
Asked if it planned to reconsider the use of lithium, Brazilian aircraft maker Embraer SA declined to comment
Ion batteries on military transport planes and new business planes.
The Embraer project uses batteries made in the United States, unlike Japanese batteries on 787.
Lockheed Martin, F-
35 joint strike fighters said that since lithium-
The ion batteries on military aircraft were made by the French Saft group and not by Yuasa.