I don't believe the difference is in the mechanical bond. I
believe tin was originally used but lead had to be added to
prevent "whiskering" which caused problems even in the old
circuits.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of alan.b.pearce@stfc.ac.uk
> Sent: Sunday, December 6, 2015 4:44 PM
> To: piclist@mit.edu
> Subject: RE: [OT]:: Causes & lessons - AIR ASIA FLIGHT
8051
> CRASH December 2014
>=20
> > Must admit, my first thought when I saw the reported
cause -
> "Bet they
> > were using Lead-free Solder".
> >
> > Or are aircraft systems exempt?
>=20
> Maybe, but ...
>=20
> Space instrumentation is working towards using lead free
> solder. When done correctly it apparently gives a much
better
> solder joint. The trick is in doing it right.
>=20
> Lead was used because it made soldering easier for the
(very)
> old manual soldering methods, not because the joint was
> actually better.
>=20
>=20
>=20
> --
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