There is something that I noticed on the photo of the electronic module.
The board on the left that has the four Leach relays looks like there was a
violation of a documented recommendation by Leach of the positioning of the
relays next to each other. The document states that the permanent magnet
inside the relay could affect the performance of another relay next to it
if it is oriented in the same direction and not separated by at least 1/8":

http://www.leachintl2.com/english/english1/vol0/properties/N023eng.htm

It looks to me like all four are oriented the same way and looks to me like
they're closer than 1/8" = .125" = 3.175mm to each other. What do you think?

Steve

On Tue, Dec 1, 2015 at 11:37 AM, Stadem, Richard D. <
[log in to unmask]> wrote:

> Agreed. There was no redundancy here, nor was there an effective default
> condition.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahne Oosterhof
> Sent: Tuesday, December 01, 2015 11:35 AM
> To: [log in to unmask]
> Subject: Re: [TN] Airbus crash pinned (in part) on solder joint failures
>
> Figure 35: Electronic Module of RTLU
>
> Not much of a failure to cause the loss of life and an aircraft!
>
> Conclusion: End-use of a board module dictates extreme level of attention
> to design and testing protocols.
>
> Ahne.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Buetow
> Sent: Tuesday, December 1, 2015 6:28 AM
> To: [log in to unmask]
> Subject: [TN] Airbus crash pinned (in part) on solder joint failures
>
> Here's the report: http://kemhubri.dephub.go.id/knkt/ntsc_home/ntsc.htm
>
>
>
> Discussion of the electrical short and cracked solder joint begins on page
> 104.
>
>
>
>
>
> Best,
>
>
>
> Mike
>
>
>
> Mike Buetow
>
> PCD&F/Circuits Assembly
>
> w/m: 617-327-4702
>
> @mikebuetow
>
>
>
> The 2015 CIRCUITS ASSEMBLY *Directory of EMS Companies:*
> circuitsassembly.com/dems
>
>
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