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Topic: ´Exploding´ Boeing battery that grounded Dreamliner fleet worldwide was ´not properly wired´, probe reveals |
´Exploding´ Boeing battery that grounded Dreamliner fleet worldwide was ´not properly wired´, probe reveals
Daily Mail [UK], by Kerry McDermott
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Original Article
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Posted By:Attercliffe, 2/22/2013 12:49:20 AM
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| A battery that overheated on a Boeing 787 flight in Japan and forced the plane to make an emergency landing was incorrectly wired, an investigation has found. The All Nippon Airways (ANA) Dreamliner touched down in Takamatsu when the lithium ion battery sparked an on-board fire, prompting the worldwide grounding of the Boeing 787 jets due to safety concerns. Japan´s Transport Safety Board has said the battery for the aircraft´s auxiliary power unit was improperly connected to the main battery, which overheated during the flight. The board´s report said a protective valve would have prevented power from the auxiliary unit
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Reply 1 - Posted by:
dragon, 2/22/2013 1:06:29 AM (No. 9190043)
Riiiiiiiiiiightttttt!
Right until the next one catches fire.
The only thing not wored properly is this dumb green (battery) initiative.
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Reply 2 - Posted by:
billp, 2/22/2013 2:02:49 AM (No. 9190064)
You´d think they noticed that back when they checked the charge system. I suspect the Japanese, who made the battery, need for anything else to be the problem. Their reputation for best at everything was on the line.
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Reply 3 - Posted by:
GoodGrief, 2/22/2013 2:16:46 AM (No. 9190069)
Trying to understand this "report" makes my head hurt. Mr/Ms McDermott seems to not understand the system or terminology involved.
In the article´s diagram nomenclature it states electricity is generated in the battery pack. This cannot be since electrical power is stored in a battery, not generated.
As a former aircraft accident investigator (USN) I have been trying to learn about the Dreamliner´s electrical systems and the Lithium ion battery problem, this article doesn´t help.
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Reply 4 - Posted by:
KTWO, 2/22/2013 2:49:43 AM (No. 9190083)
This improper wiring story differs from a Reuters stoiy that the battery cells overheated because they were too close together.
Both could be right. I speculate that the wiring was correct and spacing was the problem. Just too much heat.
The wiring harnesses would have been tested automatically. And the connectors would make it impossible for an installing mechanic to miswire. It is very hard to believe only one harness was wrong with 50 planes in service.
But stranger things have happened.
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Reply 5 - Posted by:
Spidey, 2/22/2013 3:38:51 AM (No. 9190098)
I don´t think there´s a full scientific understanding of the lithium ion battery yet.But science never gets in the way of a left wing agenda item. The Volt would have already died off without Obama ordering government departments to buy them.
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Reply 6 - Posted by:
Trigger2, 2/22/2013 3:46:08 AM (No. 9190104)
They´re afraid to say those lithium batteries have a penchant for spontaneous combustion.
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Reply 7 - Posted by:
uno, 2/22/2013 6:30:18 AM (No. 9190176)
Most batteries are somewhat tolerant to a slight over-charge condition in normal re-charging. Lithiums are not. The key thing about lithium batteries is to make sure that each cell is charged properly. Therefore there is a sensor wire for each cell to monitor charge condition. If one cell is allowed to overcharge it can combust and start a chain reaction. There may also be a microprocessor within the battery to manage the charge condition. Charging lithiums is a tricky process.
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Reply 8 - Posted by:
bullhead, 2/22/2013 10:46:17 AM (No. 9190685)
Fifty years ago, the newly developed NiCad battery went through a similar experience with overheating. The problem was solved. They are, and have been, safely used for decades.
I expect this lithium battery problem will also be corrected.
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