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December 2015

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Subject:
From:
"Upton, Shawn" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Upton, Shawn
Date:
Thu, 3 Dec 2015 13:39:27 +0000
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From what I can tell, no board rework occurred.  They did reach the level where the board (module?) should have been pulled, but instead kept resetting circuit breakers to clear the fault, then replaced the FAC module.

Shawn Upton


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Thursday, December 03, 2015 4:41 AM
To: [log in to unmask]
Subject: Re: [TN] Airbus crash pinned (in part) on solder joint failures

I only have a very broad over view of the situation with Pb free and Airbus but I believe it was their intention about 6? years -possibly a couple more
- ago to go Pb free. Whether that was for new designs only or was retrospective (re-engineer all prior Pb containing) I don't know.
In any case whether Pb+ or Pb- it doesn't change the number of times they seemingly "repaired" the cracked joints. If ground people really did repair unit every couple of weeks or so instead of pulling it for investigation for root cause (and presumably looking for the same fault in other units etc,) then it's entirely possible that the worst case scenario applied: the maintenance/service people simply touched up/reflowed the joint and put unit back in service. Its hard to see how they could do that so many times though without causing more damage. Anyway they wouldn't would they? Aren't there rules for this sort of thing?
Whatever the ground people did ignoring it and simply sticking it to the air people/pilots seems rather inadequate and a trifle scary.

--
Regards 
 
Mike 

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