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Conditions for approval required by: Julien Gauther
Certification of Aerospace Products to international quality Standards
Certification of Aerospace Products to international quality Standards
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MPI: 50 screws were MP inspected instead of 200 as per ISO7689, tables 3 and 4. However, back in the days, Mécaéro were not aware of sampling intricacy (up or down-arrow marked against sampling plan related to AQL). HFS Mécaéro stated in May 2019, that they will comply with ISO2859-1. To conclude, this is not a blocking point, just for information.
EN4138-050004B screw is too short for carrying out tensile and double shear tests.
Thus, this qualification should mention a length restriction and the length range should be from 003 to 009.
Moreover, we do not have any tensile test results on specimens, as required by ISO7689:2008. After investigating, ISO7689:1988 did not specify any tensile test on specimen when bolts are too short (ISO7689:2008 does specify tensile test on specimens when bolts are too short). At that time, ISO7689:1988 was applicable. So, we are only talking about length restriction.
PFC: could you please confirm that we do have a baking operation after cadmium plating?
We do have a stress relief operation before plating, but no information about de-embrittlement.
At that time, EN2133:1997 was applicable if I am not wrong.
As per EN2133:1997, table 2, we should have a baking operation after plating with following parameters: baking for 8 hours minimum at 190-230°C.
Many thanks in advance,
Best regards.
Report title updated to limit the approval to lengths between 003 and 009. also comment on this added to the comment section in the report.
answer to baking operation after cadmium plating/de-embrittlement question
In 2006 de-embrittlement was not shown as an individual operation in our router but was integrated to cadmium plating operation, and compliant to EN2133 requirements, baking: 10h at 190/230°C.
A full answer has been added to the support data section of the report
Many thanks!
All is clear, so approved on my side.
Best regards.