Root Cause Analysis

Component Description
Recommended
Action(s)

When the failure modes have been rank ordered by

RPN, corrective action should be first directed at

the highest ranked concerns and critical items. The

intent of the recommended action is to reduce any

one or all of the occurrence, severity, and/or

detection rankings.

If no actions are recommended for a specific cause,
indicate this by entering a “NONE” in this column.
Responsibility (for the
Recommended Action)

Enter the organization or the individual responsible
for the recommended action and the target
completion date.
Actions Taken After an action has been implemented, enter a
brief description of the actual action and effective
date.
Resulting RPN After the corrective action have been identified,
estimate and record the resulting severity,
occurrence, and detection rankings. Calculate and
record the resulting RPN. If no actions are taken,
leave the “Resulting RPN” and related ranking
columns blank.

Failure Modes and Effects and Criticality Analysis (FMECA)

Figure 17 : FMECA Quick Facts

Overview

This method identifies likely modes of failure, occurrence frequency and

detection mechanisms for a given system, in a top-down approach. It provides

a Risk Priority Number (RPN) to rank risks. The RPN is the product of the

likelihood that the failure will occur, the likelihood that the failure can be

detected, and the severity damage that a failure may cause. It can be used for

risk identification exercises, investigating many potential causes, product

design, and generation of proactive measures for prevention of undesirable

event. This tool can be used for projects as a risk mitigation tool or for existing

installations. Tool use is not limited to mechanical systems; others include

environmental, quality and safety systems.

Purpose of Criticality Analysis

Symbol C added to FMEA denotes that the failure mode analysis yields also

the criticality analysis. Criticality determination implies addition of a

qualitative measure of magnitude of a failure mode effect. The purpose of

criticality analysis is to quantify the relative magnitude of each failure effect

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