Breakdown Frequency
Breakdown frequency is the number of functional breakdown events occurring during a defined time or operating exposure.
What this term means in maintenance
Breakdown frequency is the number of functional breakdown events occurring during a defined time or operating exposure.
Possible calculation
Breakdown frequency = Number of breakdowns ÷ Operating exposure
Practical example
A line records four breakdowns during 2,000 operating hours.
Frequency = Two breakdowns per 1,000 hours
Breakdown definition
A breakdown should represent loss of required function, not every defect or maintenance request.
Use
The measure supports reliability review, PM effectiveness, and bad-actor identification.
Common mistake
Counting minor defects and total stoppages together produces an inconsistent metric.
How this term differs
Breakdown Frequency is the frequency of failures that cause loss of required function. It is related to Failure Frequency, Failure Rate, and Mean Time Between Failures, but these terms describe different records, measures, roles, strategies, or decisions and should not be used interchangeably.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Failure Frequency
Failure frequency is the number of defined failures occurring during a selected period or operating exposure.
Breakdown Maintenance
Breakdown maintenance is repair work performed after an asset has failed and can no longer perform its required function.
Equipment Reliability
Equipment reliability is the probability that an asset will perform its required function without failure for a defined time under stated operating conditions.
Breakdown Frequency FAQs
- What is breakdown frequency?
The number of functional breakdown events during a defined exposure.
- How is it different from failure frequency?
Breakdown frequency normally includes only failures causing loss of required function.
- Why define breakdown consistently?
Inconsistent event classification prevents reliable trends.