188.8.131.52 Instituting Corrective
When the failure modes have been rank ordered by RPN (the
product of S, O and D), corrective action should be first directed at the
highest ranked concerns and critical items. The intent of any recommended
action is to reduce any one or all of the occurrence, severity and/or
detection rankings. An increase in design validation/verification actions will
result in a reduction in the detection ranking only. A reduction in the
occurrence ranking can be effected only by removing or controlling one or more
of the causes/mechanisms of the failure mode through a design revision. Only a
design revision can bring about a reduction in the severity ranking.
Regardless of the resultant RPN, special attention should be given when
severity is high.
After the corrective action(s) have been identified, estimate
and record the resulting severity, occurrence, and detection rankings and
recalculate the RPN.