The answer may be yes, it may be no. Firstly, you give no indications
how the cleaning/measurement process was qualified. Secondly, you give
no indication how the process control is carried out. No matter how well
the qualification was determined, if the process control is not done
correctly, you may be at risk. Thirdly, you tell us not the type and
application method of the conformal coating.

How long is a piece of string? Or, as another illustrious member of this
forum will tell you, it depends!

Brian

Donald Vischulis wrote:
> 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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