November 2013

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HP Automation Safety: MTTR: Reality vs. calculation

Many reliability engineers trained before IEC 61508 know the acronym MTTR as “mean time to repair.” I certainly learned that definition. Naturally, I think of the time it takes to repair som..

Goble, W., exida LLC

Many reliability engineers trained before IEC 61508 know the acronym MTTR as “mean time to repair.” I certainly learned that definition. Naturally, I think of the time it takes to repair something. Example A few months ago, my vehicle would not start one morning. In response to the situation, I measured the battery voltage with no load and again with the key turned to the start position (full load). It was clear that the battery was discharged. So I hooked up the battery charger. Total labor time was about one hour. After trying for a full day to recharge the battery, I drove to the auto parts store and purchased a new battery. This took two hours. Installation time required a

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