I'll string you along some more: under what conditions of temperature
and humidity is it 8.4 cm long, and what type of fibre? (Bet that's good
to start a Friday discussion! :-) )
Brian
Douglas O. Pauls wrote:
> Don,
> You have already received some good advice from Joe, Brian and Lee.
>
> In my opinion, no an ionic cleanliness tester is enough. We have them in
> all of our facilities. We have not failed a test in 15 years. We continue
> to do it because our customers what to see some form of cleanliness
> monitoring. It makes them happy, so it makes us happy.
>
> The J-Std-001 approach is one way to do a process qualification. Newer
> methods are being developed, but may not quite be ready for prime time.
> If you are manufacturing commercial avionics, as we are, you are probably
> familiar with the DO-160 document, levied by the FAA. We run those tests
> whenever we qualify a new product. I would suggest you run ion
> chromatography, as well as Omegameter, on samples that then are qualified
> in the DO-160 tests. The humidity tests will be the most telling. If
> desired, you can take the 10 day worst case humidity test and extend it
> out. If you are producing military avionics, as we are, then the same
> approach applies for Mil-Std-883 tests. Doing IC gives you a good idea of
> what residues are present. The ionic cleanliness tester tells you its
> metric for the product, which you can then use as a target for process
> control. The functional tests tell you if those levels of cleanliness are
> adequate for your product in your end-use environment.
>
> Doing it this way means your data is 100% relative. Going the J-STD-001
> route you have to interpret how much the lab data approximates real world
> data. Always an iffy proposition.
>
> And Brian, we already established last year that a piece of string is 8.4
> cm long. So stop asking that question.
>
> Doug Pauls
>
>
>
>
> Donald Vischulis
> <dvischulis@EARTH
> LINK.NET> To
> Sent by: TechNet [log in to unmask]
> <[log in to unmask]> cc
>
> Subject
> 03/09/2006 04:58 [TN] Cleaning Qualification
> PM Question
>
>
> Please respond to
> Donald Vischulis
> <dvischulis@earth
> link.net>
>
>
>
>
>
>
> All
>
> I've been assigned the task of determining if a supplier's current cleaning
> process is robust or if additional testing is required to be able to say
> that the product is clean enough to provide years of field use. The board
> is a 2-sided Class 3 assembly (95% SMT) with one BGA and about 1500 other
> components. The assembly is soldered with a water soluble flux, it's
> cleaned in a batch cleaner with DI water, and is conformal coated. The
> current manufacturer is using and Omega meter to verify the cleanliness of
> the board after cleaning.
>
> My questions:
>
> Is this process good enough to provide a reliable product in an aircraft
> application?
> If not what guidance is available to determine what level of process
> qualification is needed to answer question #1?
>
> Any help is really appreciated.
>
> Don Vischulis
>
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