A PFMEA Use Question

Abstract

Carl and Fred discussing an interesting question from a subscriber to the Inside FMEA series. The question has to do with selected process steps on a Process FMEA, and the efficacy and value of the occurrence rating being verified later in pilot assembly or trial production.

Key Points

Join Carl and Fred as they discuss whether or not the PFMEA occurrence rating should be verified in trial production.

Topics include:

• Occurrence rating in PFMEA is not usually an objective numerical failure rate. When PFMEAs are done on new or modified processes, the field or plant data is not the only input to occurrence rating.
• PFMEA occurrence rating is used (along with severity and possibly detection) to prioritize issues for follow-up action.
• Discussion on how PFMEA occurrence rating is determined and how it is used.
• Discussion on subjective ratings in an FMEA.
• Primary purposes of PFMEA include improving the process design and improving the process control plan.
• One of the outputs of FMEA is to learn where to go look.
• Linkage between PFMEA and Process Control Plan.
• Limitations of doing FMEAs on everything

Enjoy an episode of Speaking of Reliability. Where you can join friends as they discuss reliability topics. Join us as we discuss topics ranging from design for reliability techniques to field data analysis approaches.

SOR 782 A PFMEA Use QuestionCarl S. Carlson

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