Root Cause Failure is defined as which of the following?

• A. Maintenance performed to prevent equipment failure.
• B. Assessment of the overall condition of equipment.
• C. Identifying the underlying cause of equipment failure.
• D. Maintenance based on the condition of equipment.

Answer: (C)

Root Cause Failure Analysis is about identifying the underlying cause of equipment failure so you can prevent recurrence. This approach digs beyond what failed and when it failed to uncover the fundamental reason the failure happened—such as a design flaw, improper maintenance, lubrication issues, or human factors—and then it uses those findings to implement corrective actions that stop the problem from happening again.

That’s why the best choice is describing the underlying cause of the failure. It’s not just about preventing failures in general or assessing current condition, but about diagnosing the real reason the failure occurred and addressing it at its source. For example, if a bearing fails due to misalignment, RCFA looks at why misalignment happened and fixes that root issue to prevent future failures, rather than just replacing the bearing or monitoring the condition.