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From: Paul Keinanen on 7 Jul 2008 13:51
On Sun, 6 Jul 2008 22:48:55 -0700 (PDT), rickman <gnuarm(a)gmail.com>
wrote:

>This is just my opinion of course, but have you considered that
>although someone is asking for 20 to 40 year product life (btw 20 to
>40 years is not spec, they need to decide if 20 is good enough or if
>they really need 40) is that really a useful target. Usually a long
>life time for a product is desired when the development requires a lot
>of testing or there is some other high expense associated with
>changing the product.

In the industrial sector that I work most of the time, the typical
contractual requirement is that the product should have at least a 10
year support period.

One of my customers are using a design that was made 20 years ago and
they still tried to sell it (even if a replacement product has been
available for a decade). I successfully tried to warn them that if
such products are sold today, we still would have to support it for
the next decade.

Fortunately that product version is no longer sold to new
installations, but of course we have to support current installations
with the original product or with the replacement product for the next
decade.

Paul

From: Robert Adsett on 7 Jul 2008 19:39
In article <2b94272f-ffd2-4c72-8fb5-26776e4563e4
@c65g2000hsa.googlegroups.com>, rickman says...
> Looking at your stated requirements realistically, I think that 20
> years is a very outside possibility for a product lifetime.

Think of life as sales life + service life and the outlook may be a
little different. At one time a company I was working for was looking
at developing a product with another company. One of the requirements
was that there be service spares available for 20 years after the *end*
of normal production.

That places a minimum availability requirement on components, unless you
are willing to reserve resources for continuing engineering after the
end of the sales life of the product the service parts are for.

What's the service life of a Boeing 747?

Robert
** Posted from http://www.teranews.com **
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