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February 2011

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Subject:
From:
Mike Buetow <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Mike Buetow <[log in to unmask]>
Date:
Thu, 10 Feb 2011 16:16:06 -0500
Content-Type:
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text/plain (91 lines)
I don't think it's that simple. In fact, I think this report raises as
many questions as it answers. 

Note that there are two reports on the NHTSA website. One is the NHTSA
report (77 pages); the other is the NASA report (177 pages).

http://www.nhtsa.gov/UA

http://www.nhtsa.gov/staticfiles/nvs/pdf/NASA-UA_report.pdf

The NASA report is very clear about the presence of tin whiskers (page
120-123). It also noted a failed pedal assembly contained multiple
whiskers, while several other pedals reviewed also contained tin
whiskers, although no failures were (yet) seen. Keep in mind only a
handful of vehicles were used for the analysis, which means the results
might not be representative of the entire fleet of Toyotas in use. In
some cases an all-tin solder was used. The CTS-built pedals lacked
conformal coating on the boards (page 125). The Denso-built pedals were
built with SAC solder and embedded in a "potting substance" (page 127).

I find it very interesting that the number of complaints of unintended
acceleration have tapered off to zero. How is it that there was such a
cluster of bad drivers, and then none at all? Is Toyota designing
something different (other than the shimmed pedal)? Using a different
solder and/or finish? Something doesn't add up. There are a lot of
unanswered questions, IMO.

Not to put anyone on the spot, but I would also be curious whether the
Joint Group on Pollution Prevention is planning to take any of the NASA
findings into account?


Best,
Mike

Mike Buetow
Circuits Assembly
w/m 617-327-4702

VIRTUAL PCB: the electronics industry's only online trade show!
www.virtual-pcb.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Pierce
Sent: Thursday, February 10, 2011 3:36 PM
To: [log in to unmask]
Subject: [TN] NTC: Excuse me, but...

where can engineers go to get their reputation back?

http://tinyurl.com/ToyotaEETimes

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