Today's Message Index:
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1. 07:55 AM - Re: Re: Same rating for fuses and circuit breakers? (Robert L. Nuckolls, III)
2. 08:40 AM - Thank You (Bernie Willis)
3. 08:52 AM - Re: Thank You (Bernie Willis)
Message 1
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| Subject: | Re: Same rating for fuses and circuit breakers? |
At 09:41 AM 10/26/2018, you wrote:
>At 07:29 PM 10/25/2018, you wrote:
>>Right You Are Charlie:
>>
>>Here is another thought?
>>In the AC world there is a thing know as a Ground Fault Interrupt (GFI)
>
> Yup, got 'em in airplanes too. After the Swiss Air 111
> disaster there was a push to develop a breaker
> with soft-fault detection built in. TI and others
> rose to the occasion and you can buy such critters
> today . . . if your wallet is fat enough.
>
> Anybody work for Boeing or Airbus? Know anybody
> who might fill us in on just how many such devices
> have found their way onto there products? I'm
> betting its VERY few if any.
Actually, That's wrong. The S.A.111 accident
was precipitated by a 'soft' fault (intermittent
arcing at current level too low to trip breaker,
but releasing LOTS of energy into adjacent
combustibles).
Unlike the hard fault for which the legacy
breakers are designed to clear, soft fault
detection calls for software based monitoring
for a noise signature indicative of the soft
fault. Kinda black magic.
So I'll correct my earlier assertion . . . GFIs
don't exist for aircraft. In fact, they wouldn't
work in a system that specifically uses airframe
ground as the return power path.
Bob . . .
Message 2
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Hi Dave,
Just want to thank you again for sharing your U-2 flying experiences with our local
EAA Chapter 42.
Regards,
Bernie Willis,
Chapter 42, President.
Message 3
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Sorry wrong address,
Bernie
> On Oct 27, 2018, at 7:39 AM, Bernie Willis <arcticarrow@gmail.com> wrote:
>
>
> Hi Dave,
>
> Just want to thank you again for sharing your U-2 flying experiences with our
local EAA Chapter 42.
>
> Regards,
> Bernie Willis,
> Chapter 42, President.
>
>
>
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