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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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Hardness test (Test Report): actual values are not written in “Dureté / Hardness” section.
Hopefully, actual values are listed in « Métallurgie” section and 10 results are reported.
As per EN3152, for Acceptance, hardness test sample size shall be carried out according to table 6.
If it is considered as destructive test, 5 parts are needed (4235 manufactured parts)
If it is considered as non-destructive test, 20 parts are needed (4235 manufactured parts)
Unfortunately, EN3152, clause 5.4.8 does not indicate if hardness test it is a destructive or a non-destructive one.
Thus, if it is a destructive test, we are compliant, but if not, we are not.
From my point of view, hardness test is a destructive test since at the end, we will have an indentation mark on the nuts. Indentation marks do not completely destroy nuts, but end user may be surprised to see that and these marks may be detrimental when in service.
What are your thoughts on this topic?
Self-locking torque-three cycles test: is there any lubrication applied for this test? If so, which one?
Indeed, in TR, “Lubricant” box is empty.
Many thanks in advance,
Best regards,
Julien
Hi Julien.
My response to your comment above.
The hardness values (Dureté) listed in the “Metallurgy” column of Test Report TR15058087 rev 0 are the hardness values measured for this qualification. The Hardness Test is considered a destructive test at Howmet St-Cosme. Given the numbers produced and the correct table, 5 parts would be enough to demonstrate compliance. Because the 10 measured values are all HRC 41, I have also accepted this as compliant.
No lubricant was used in the Self-locking torque-three cycles test, so it was good in the TR that the block was empty.
If there are any questions regarding my response to your comment. Don’t hesitate to contact me.
Regards
Kees
Hi Julien.
There was a little confusion of tongues!
Some lubricant (AIR3514) was used in the Self-locking torque-three cycles test, so the TR 15058087 has been updated (rev 2) accordingly.
Regards
Kees
Many thanks to Kees and HFS’ team.
All is fine for me now, thus, approved from my side.
Best regards,
Julien