This is part four in our advanced CMMS metrics series. For parts 1-3, check out the links below:
Preventive maintenance compliance
Preventive maintenance (PM) is when regular maintenance is carried out on equipment to decrease its likelihood of failing. The purpose of preventive maintenance is to spot issues before they become bigger problems, so it’s important to complete it on time. Your preventive maintenance compliance (sometimes referred to as PM compliance or PMC) score is the percentage of scheduled preventive maintenance work orders that get done in a defined period of time.
How do you calculate PM compliance?
- Define the preventive maintenance schedule and tasks for each asset
- Conduct the preventive maintenance at the defined interval
- Measure the percentage of the PM work-orders completed in the defined interval
- That is your PMC score
- Week 1: 5 PM work orders scheduled, 4 completed
- Week 2: 5 PM work orders scheduled, 1 completed
- Week 3: 5 PM work orders scheduled, 5 completed
- Week 4: 5 PM work orders scheduled, 4 completed
Your PMC score = (4+1+5+4)/(5+5+5+5)= 0.7 or 70% for the month
Want to learn more about key performance indicators (KPIs) for maintenance excellence?
Read our "Advanced CMMS Metrics" eBook to find out how you can measure them with your CMMS software.
PM compliance gets mixed reception from operations managers as a useful metric to measure maintenance performance. Because the formula only measures whether preventive maintenance was completed (not whether it was late), it’s possible for PM compliance to be 100% while system downtime is still a major issue.
This is where the 10% rule of maintenance comes in. The rule states that a preventive maintenance action should be completed within 10% of the scheduled maintenance interval. For example, a quarterly PM every 90 days should be completed within nine days of the due date or it is out of compliance. The 10% rule helps keep your PM intervals constant, reducing the time variable variation, thus improving reliability.
If done correctly, measuring PM compliance and charting it against unscheduled breakdowns and costs is an excellent way to determine if your PM program is working for you or if it needs to be adjusted to balance uptime, productivity, maintenance costs, reliability and asset life.
How do you measure PM compliance?
If you’re still using pen and paper or Excel, it is next to impossible to get an accurate indicator of PM compliance. The easiest way to calculate your PM compliance is with your CMMS.
There are a number of PM compliance reports in Fiix that take the suggested completion date into account when calculating PM compliance. So, for a monthly PM, the technician should complete that PM within three days of the trigger date. The report will only mark that PM as compliant if it is complete, and secondly, if it is complete before the required date.