New program, yes. But that is not new.
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Dale Ritzen [mailto:[log in to unmask]]
Sent: Tuesday, March 20, 2012 01:59 PM
To: 'TechNet E-Mail Forum' <[log in to unmask]>; Joyce Koo
Subject: RE: [TN] Out of the world tin whiskers
Joyce,
I know your question below is basically rhetorical, but have you tried to find a component without a Pb-free coating on it lately... That is, unfortunately, why there are Pb-free components on spacecraft... and obviously tin whiskers.
Dale Ritzen, CQA
Quality Manager / ISO Management Representative
Austin Manufacturing Services
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Tuesday, March 20, 2012 12:57 PM
To: [log in to unmask]
Subject: Re: [TN] Out of the world tin whiskers
I thought space is exempt for leadfree. Why?
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Inge Hernefjord [mailto:[log in to unmask]]
Sent: Tuesday, March 20, 2012 01:47 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Out of the world tin whiskers
DO THEY NEVER LEARN!
Inge
On 20 March 2012 18:08, Gervascio, Thomas L <[log in to unmask]>wrote:
> Tin whiskers at Saturn
>
> PASADENA, Calif. -- The Cassini plasma spectrometer instrument (CAPS)
> aboard NASA's Cassini spacecraft at Saturn has resumed operations. Mission
> managers received confirmation on Friday, March 16, that it was turned on.
> They plan to monitor the instrument for any unusual behavior.
> Last June, short circuits in the instrument led to unexpected voltage
> shifts on the spacecraft. As a precaution, mission managers turned off the
> CAPS instrument while engineers investigated the issue. The investigation
> led to the conclusion that tin plating on electronics components had grown
> "whiskers." The whiskers were very small, less than the diameter of a human
> hair, but they were big enough to contact another conducting surface and
> carry electrical current. Researchers are still trying to understand why
> whiskers grow on tin and other metals, but they know now that whiskers can
> grow in space and on Earth. It is believed that these or additional tin
> whiskers that may grow on Cassini cannot carry enough current to cause
> problems, but will burn out on their own like a lightweight fuse.
>
>
>
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