CMRP - Certified Maintenance and Reliability Professional Root Cause Failure Analysis Questions and Answers

Question 1

A team investigating a recurring bearing failure identifies that a technician used the wrong lubricant. The team's analysis concludes the root cause was 'human error' and recommends retraining the technician. Why is this Root Cause Failure Analysis (RCFA) considered incomplete?

Accepted Answer

It failed to identify the latent or systemic root causes that allowed the error to occur.

Answer

A thorough RCFA must go beyond the human cause to uncover the latent, or systemic, root causes. While the technician's action was the human cause, the investigation must ask further 'why' questions: Why was the wrong lubricant used? Was the procedure unclear? Was the correct lubricant unavailable? Was the labeling system confusing? Was there production pressure to finish the job quickly? Addressing only the human error by retraining one person does not fix the underlying organizational systems that allowed the mistake to happen, making recurrence likely.

Question 2

When initiating a Root Cause Failure Analysis for a catastrophic mechanical breakdown that has just occurred, which of the following actions is the MOST critical first step?

Accepted Answer

Securing the failure site and preserving all physical evidence in its 'as-failed' state.

Answer

The most critical initial action in a physical failure investigation is to preserve the evidence. Actions like removing, cleaning, or disassembling components can destroy crucial information such as fracture surfaces, witness marks, debris, and the exact position of failed parts. While interviewing personnel, reviewing records, and forming a team are all essential parts of the RCFA process, they can be done after the scene has been secured. Loss of physical evidence is often irreversible and can make determining the physical root cause impossible.

Question 3

Which of the following statements best describes a primary characteristic of the 5 Whys analysis technique?

Accepted Answer

It is a simple, iterative questioning method used to explore the cause-and-effect chain behind a problem.

Answer

The 5 Whys technique is a straightforward, iterative method that involves repeatedly asking "Why?" to peel back the layers of symptoms and uncover the root cause of a problem. Its strength lies in its simplicity and accessibility, allowing teams to quickly drill down from an obvious symptom to a deeper, underlying issue without needing complex software or extensive training.

Question 4

A reliability engineer is choosing a tool to analyze a complex failure with multiple, interacting causes and wants to graphically display all potential causes organized by categories. Which RCFA tool is best suited for this purpose?

Accepted Answer

Ishikawa (Fishbone) Diagram

Answer

The Ishikawa (Fishbone) Diagram is specifically designed to facilitate brainstorming and visually organize a wide range of potential causes into categories. Common categories include the 6Ms (Manpower, Method, Machine, Material, Measurement, Mother Nature/Environment), which helps the team explore all possible contributing factors systematically, making it ideal for complex problems where the cause is not immediately obvious.

Question 5

An RCFA investigation correctly identifies the systemic root cause of a recurring pump failure as an inadequate specification for the bearing type during the procurement process. The team submits a detailed report with this finding. To ensure the RCFA creates lasting value, what is the MOST important subsequent action?

Accepted Answer

Creating a formal corrective action with an owner and due date to update the procurement specification.

Answer

An RCFA is only effective if its findings are translated into action to prevent recurrence. The most critical step after identifying the root cause is to create a specific, measurable, actionable, relevant, and time-bound (SMART) corrective action. This involves assigning a specific person (owner) the responsibility for updating the procurement specification and giving them a clear deadline. Without this step, the valuable findings in the report are likely to be forgotten, and the problem will eventually return.

CMRP Certified Maintenance and Reliability Professional Practice Practice Test

CMRP Certified Maintenance and Reliability Professional Practice Practice Test

CMRP - Certified Maintenance and Reliability Professional Root Cause Failure Analysis Questions and Answers