Re: [SystemSafety] 787 Groundings

From: Matthew Squair < >
Date: Fri, 8 Feb 2013 13:58:03 +1100

For those on the list interested in the followup to the B787 battery fires, the NTSB investigation and it's results to date can be found at I've also posted on the issue at Critical Uncertainties

On Fri, Jan 18, 2013 at 8:34 PM, Peter Bernard Ladkin < ladkin_at_xxxxxx

> Just in case y'all missed it, the FAA has grounded US 787 aircraft because
> of the battery issues.
> grounding-order-moves-787-**into-uncharted-territory-**381148/<>EASA followed suit, which grounded LOT's two:
> regulator-adopts-faas-787-**grounding-381166/<>and various other countries.
> The 32V 8-cell lithium-ion batteries are made by the Japanese company GS
> Yuasa. I didn't know that a building in Tucson "burned to the ground"
> during a "botched" test of one of the batteries in 2006.
> Flight International in its paper edition this week has an article, also
> by Stephen Trimble, (p15) written before the latest incident, including a
> diagram source to Boeing of "787 lithium-ion battery locations". There are
> two; the APU-starter battery in the aft bay by the aft cargo door, and the
> main battery in a bay under the aft cockpit, accessed through an "equipment
> access door" in the aircraft. I can't find this article on the FlightGlobal
> WWW site.
> The ground explosion in Boston was the APU battery, and the latest
> smoke-in-flight incident was reported to have been associated with the Main
> Battery.
> Bernd and I have been questioning why and how on earth a battery
> technology known to be susceptible to thermal runaway, with consequences
> fire and explosion, made it into an aircraft. Yes, Boeing went to extra
> lengths and the FAA required specific justification and so on. But why take
> the chance just to save a few kilos? Does anyone here have a handle on the
> economics of it?
> I found out an interesting tidbit on Tuesday at a meeting of the German
> electrotechnical/**informatiotechnical standardisation organisation DKE
> in Frankfurt (in a committee I chair). We did get around to a little chat
> about the news. Apparently the DKE standardises the individual cells of
> batteries, but another standardisation organisation, VDA, which
> standardises stuff to do with automation, has the battery remit. I guess
> there was a time when automation had little to do with electrotechnics, but
> all that has changed in the last half-century. I imagine there was some
> horse-trading in the recent past as the two areas converged, but I don't
> know any of that yet. The car people have their own, NA-Automobil, and
> there is the overall industrial-standardisation body DIN.
> --
> Prof. Peter Bernard Ladkin, Faculty of Technology, University of
> Bielefeld, 33594 Bielefeld, Germany
> Tel+msg +49 (0)521 880 7319
> ______________________________**_________________
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> systemsafety_at_xxxxxx >

*Matthew Squair*
Mob: +61 488770655
Email: MattSquair_at_xxxxxx

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Received on Fri Feb 08 2013 - 03:58:13 CET

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