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NTSB: Boeing 787 battery shows short-circuiting

WASHINGTON (AP) - The Boeing 787 Dreamliner battery that caught fire earlier this month in Boston shows evidence of short-circuiting and a chemical reaction known as "thermal runaway," in which an increase in temperature causes progressively hotter temperatures, federal accident investigators said Thursday. It's not clear to investigators which came first, the short-circuiting or the thermal runaway, National Transportation Safety Board Chairman Deborah Hersman said. Nor is it… ( Altro...

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Foxtrot789 4
How does this not come up in testing? It just seems hard to believe that they were all fine during the hundreds (probably thousands) hours of testing yet as soon as they hit the airlines you've got multiple failures on different aircraft.

Could it just be a bad batch of batteries that landed in the few planes that had issues?
Is this not the same problem that happened during testing a couple of years ago when one of the first test planes had to land in Laredo, TX?

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"THOUSANDS OF DOLLARS" lol. Boeing and the airlines only wished this cost was so small. This is going to cost billions.
The allegation is that Boeing bought these Japanese batteries so that Japan would have multiple airlines commit to the 787. You scratch our back, we'll scratch yours.
btweston 1
It is often said , “ I do not remember what I was taught , but I remember what I learnt “ .
Recently , a bat got trapped in the indoor stadium disrupting many times the basket ball game in USA . All efforts to drive it away failed . After a lot of failed attempts some one remembered from school time biology lesson that bats see and navigate better in darkness ! And the lights were turned off . And the result was obvious . to every one’s happy surprise .
Again ,lesson to be learnt is that when solution to complex problems eludes you , take a deep breath , try to solve it from basics , from first principles , and using some common sense .
I read that Boeing knew about this in 2006. And somewhere else that Lithium Ion batteries are not a good choice for this application. But Boeing are not idiots, surely?? Perhaps, as some are suggesting, they may however be aggressive penny-pinchers.
Use a different brand of battery.
used American Battery
In one my of comments on the same subject in another squawk a few days ago , I had written about rechargeable batteries .It read as follows :-
" Li-ion Battery problems
We all know from our school level knowledge of Chemistry that while charging , electrical energy is converted into chemical energy and in the process heat is generated . The charging current ( and thus the voltage and time ) depends upon the quantity of chemicals and size of electrodes used . All systems are designed to have a variable resistor to control the current/voltage . As soon as charge is picked up the internal resistance between electrodes increases which reduces the charging current and the heating is also reduced . The impurities invariably create path of least resistance and hence the charging current may increase causing additional/excessive heat ! Purer the chemicals higher will be the resistance and better will be the charge retention . The rest of the story can easily be built by the esteemed readers! Who faltered and where and how? "
From high school days I remember that we were generally asked to derive formulae from " first principles " . Lesson to learn here is , if solution eludes you , try to solve complex problems from basics ! This so called "thermal runaway" is clearly dealt with in my comment involving impurities . Remember , my comment is utterly based on crude basic principles of Electro Chemical energy . Ha , ha , .
If they are really looking for serious answers , they must seek them from basics and first principles . They must think and search like college freshman and not like a multimillion dollar contract touch-me-not senior executive ! And behold ! Long before the answers will stare right back at you , stark in the face .
Odd that the 787 went into service October 2011 but the battery issues all came up at the same time over the last several months. For the first 9 months only incident I can recall is an ANA that had a gear issue which turned out fine.
This aircraft has been Test Flown thousands of hours. Why bad batteries now ? What Changed ?
There were some indications of this during a flight from Delhi to Bengaluru on an Air India flight....guess no one thought it will be this serious...

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skylloyd 4
I think we got the picture, George.
George.. A few spelling lessons would not go astray, and STOP SHOUTING .

BTW..I have worked in Japan for a American firm, and some of the screw ups I saw coming from USA were unbelieveable.


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