Warranty Analysis for Repairable Systems

Abstract

Chris and Fred discuss how we do warranty analysis … which usually means trying to understand how many things fail during a warranty period (before you need to start paying for it …) Where do you start?

Key Points

Join Chris and Fred as they discuss warranty analysis … based on a question from a listener who wanted to know how we do it for a repairable system. So … how do we do it? We didn’t get a lot of specifics from the listener … so we had to ad lib a bit?

Topics include:

• What are you trying to do? Don’t rush through this question. Are you trying to predict what fraction of products will fail in the warranty period. Or … do you have a warranty reliability target and instead want to learn how long it will take for your product’s reliability to drop to that level to find the warranty period. Or … are we on track? Or … are we having too many warranty failures and need to find out why? Or … something else?
• This let’s you know if your analysis is quantitative or qualitative. Do you need to know why something is failing more than it should … or what percentage of things you expect to fail. That’s a big deal.
• But what should our targets be? Well … we sometimes miss this as well! But it’s the first and most important bit. We have seen lots of organizations furiously (attempt) to analyze warranty reliability, but not really know what ‘good enough is.’ Have you ever asked your boss or leader why we are analyzing something, and they something like ‘just to get an idea of where we are at‘ but without them being able to tell you where we need to be? This is BAD. And the reason it is bad is that we might come up with a number and then decide if it is good (or not). This usually always results in us coming up with our own criteria to justify the outputs of our hard work. Instead … take the time to work out where you should be first (with minimal emotions, and lots of business planning) and then see if you are there or not. The truth not only hurts, but it also sets you free.

Enjoy an episode of Speaking of Reliability. Where you can join friends as they discuss reliability topics. Join us as we discuss topics ranging from design for reliability techniques to field data analysis approaches.

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Show Notes

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