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How to lose both ignition systems?

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Builder_Bill

Joined: 19 Sep 2012
Posts: 7
Location: Newport News, VA USA

Posted: Thu Aug 29, 2013 12:29 pm Post subject: How to lose both ignition systems?

Bob, I was at your seminar at EAA431Brodhead, WI this Spring.



There was a discussion on an accident involving a Lancair Dual LSE Ignition failure. I could not find it in a simple NSTB search assuming I even have enough details right to do so.



The builder had supplied each LSE from an independent source, but failed to consider something else. Something about fuse & CB's in series maybe?



Can you detail what happened to take down both LSE's? It's likely that sketch will be necessary. 



Thanks,

Bill Jones

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Aug 29, 2013 6:09 pm Post subject: How to lose both ignition systems?

At 03:29 PM 8/29/2013, you wrote:

 	  Quote: 	
		  

<jonesw(at)mindspring.com>



Bob, I was at your seminar at EAA431Brodhead, WI this Spring.



There was a discussion on an accident involving a Lancair Dual LSE 

Ignition failure. I could not find it in a simple NSTB search 

assuming I even have enough details right to do so.



The builder had supplied each LSE from an independent source, but 

failed to consider something else. Something about fuse & CB's in series maybe?



Can you detail what happened to take down both LSE's? It's likely 

that sketch will be necessary.


	


    Yes. That case settled a few weeks ago. I'm going to publish

    my reports and demonstration videos that were produced in

    support of the technical analysis. I need to 'sanitize' them

    a little so as to avoid causing unwarranted discomfort on

    the part of the participants.



    In any case, it is unlikely that anyone here on the

    List would repeat the error . . . an error that grew out

    of a combination of 'redundancy' features stacked on top

    of each other combined with a poor selection of components

    wherein both systems shared hardware in the power path.



    Run each ignition from a separate protective device on

    the battery bus . . . or separate battery busses if there

    are two batteries. Simple, direct, no shared hardware

    and truly redundant.



   Bob . . .

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Builder_Bill

Joined: 19 Sep 2012
Posts: 7
Location: Newport News, VA USA

Posted: Fri May 09, 2014 9:47 am Post subject: Re: How to lose both ignition systems?

Hello Bob and AEC.

Can we re visit this one. I've read the NTSB accident narrative, but I need a sketch to follow this builders mistake.



Thanks, Bill

 	  nuckolls.bob(at)aeroelect wrote: 	
		  At 03:29 PM 8/29/2013, you wrote:

 	  Quote: 	
		  

<jonesw>



Bob, I was at your seminar at EAA431Brodhead, WI this Spring.



There was a discussion on an accident involving a Lancair Dual LSE 

Ignition failure. I could not find it in a simple NSTB search 

assuming I even have enough details right to do so.



The builder had supplied each LSE from an independent source, but 

failed to consider something else. Something about fuse & CB's in series maybe?



Can you detail what happened to take down both LSE's? It's likely 

that sketch will be necessary.



	


    Yes. That case settled a few weeks ago. I'm going to publish

    my reports and demonstration videos that were produced in

    support of the technical analysis. I need to 'sanitize' them

    a little so as to avoid causing unwarranted discomfort on

    the part of the participants.



    In any case, it is unlikely that anyone here on the

    List would repeat the error . . . an error that grew out

    of a combination of 'redundancy' features stacked on top

    of each other combined with a poor selection of components

    wherein both systems shared hardware in the power path.



    Run each ignition from a separate protective device on

    the battery bus . . . or separate battery busses if there

    are two batteries. Simple, direct, no shared hardware

    and truly redundant.



   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 09, 2014 10:36 am Post subject: How to lose both ignition systems?

At 12:47 PM 5/9/2014, you wrote:

 	  Quote: 	
		  

<jonesw(at)mindspring.com>



Hello Bob and AEC.

Can we re visit this one. I've read the NTSB accident natative, but 

I need a sketch to follow this builders mistake.



Thanks, Bill




	


   See N811HB at . . .



http://tinyurl.com/ky7szec



   . . . for a detailed data dump



   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat May 10, 2014 8:32 am Post subject: How to lose both ignition systems?

At 12:47 PM 5/9/2014, you wrote:

 	  Quote: 	
		  

<jonesw(at)mindspring.com>



Hello Bob and AEC.

Can we re visit this one. I've read the NTSB accident natative, but 

I need a sketch to follow this builders mistake.


	


   Bill, I didn't remember that the file-set

   I posted had a few of holes in it.



   hit these three links . . .



http://tinyurl.com/kyfn4y2



http://tinyurl.com/lmbbrmg



and particularly . . . this one



http://tinyurl.com/k5593wo



   Bob . . .

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