Include Failure Modes When Doing an MSA on a Test Process?

Six Sigma – iSixSigma Forums General Forums Methodology Include Failure Modes When Doing an MSA on a Test Process?

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    Our current leak detection process is not reliable. I am validating our leak detection process (mass decay) and I am wondering if I should include units with known failure modes in the MSA. For example, should I include units with pinched, missing, and cut o-rings in the study? Or should I only do the MSA on good units? This wouldn’t really help us fix the end issue since we are concerned with its ability to catch leaking units.

    Also, the units that are escaping to our customer are not close to the spec limit when we test them. They leak at the same rate as our passing correct pumps.

    Spec is 0-5 scc/m. Returned leaking pumping are passing our process at 0-2 scc/m.

    Is an MSA the correct tool to validate tests?




    Chris Seider

    If you say customers are returning things that are “within spec”, it initially says to me
    1. Can you measure the leak rate correctly (MSA on the leak test results itself)
    2. Are you measuring the rate output characteristic (maybe leakage at a different condition than on a bench is needed)
    3. Are you specs correct since they should emulate what customers want
    4. To answer your question–yes always want distribution of product/service including those with defects to be evaluated.

    However, you already have a strong hint that the spec isn’t adequate if customers return items that are within spec….consider conditions, etc.

    Of course, once you find the failures seen by customers, then you can tackle the X’s causing them.


    James Heidt

    I agree, the key is that you aren’t detecting the failures that your customers are detecting. A careful VoC and review of the conditions under which customers are detecting these failures is key. Then you can target those elements of your measurement system that are supposed to detect the leak.

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