Pass-Though Characteristics in PFMEA (Process FMEA)

Z

Zbigniew Huber

Hi,

Some product special characteristics (usually stated on blue prints) are ?pass-through characteristics (PTC)?.
The PTC characteristics are ?inherited? from suppliers and then not modified and not controlled in subsequent manufacturing processes, are just passed to OEM factories (like material flammability).

In my case the PTCs are checked at receiving inspection via certificates (CoC) for each delivered batch and additionally via periodic material/lab testing.

I think that the PFD and PFMEA for receiving inspection should include operations related to check for the PTC characteristics (CoC verification etc) and it should be reflected in Control Plan to match PFC-PFMEA-CP.

How would you recommend handling of pass-through characteristics in PFD, PFMEA and Control Plan?
 
A

adamsjm

Hi,

Some product special characteristics (usually stated on blue prints) are ?pass-through characteristics (PTC)?.
...
How would you recommend handling of pass-through characteristics in PFD, PFMEA and Control Plan?

Pass-through characteristics are handled exactly as any other requirement [Blue print (BP), In process (IP), process control (PC), or engineering specification (ES).] The only real difference is that your supplier is responsible for corrective action instead of your company since you do not control the process. This does not negate your company's responsibility to ensure root cause and corrective action is taken in a timely manner. Your company supplied the product to your customer.
 
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