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We currently have a goal of less than 10% unplanned downtime. We have three main production lines. In 2014 we were in the low teens and in 2015 at 8%, 13% and 9%  What should our goal be for world class performance?

Considerations:

Because of our process we are required to take 12 - 16 hours planned down time each week. A lot of corrective maintenance takes place during this time. If we are required to take this down time early we count the entire time as unplanned. If maintenance is responsible for a delay in returning to production we take that time as unplanned.

We have excellent trending of production parameters. We are able to calculate unplanned downtime very accurately.

When i received the AMP newsletter in my in-box the subject heading was "[AMP] How Do You Accurately Track Down Time?" and featured your discussion here. I was going to reply, use our trademarked "True Downtime Cost" (TDC), see http://downtimecentral.com/tdc.shtml . Imagine my surprise when I got here and found out the "how to" was not your question, but in was what is considered world class percentage? I believe your goal should be always constant improvement, regardless of what people's opinion in as to what is today's "world class" percentage.