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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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QTR, NDT section:
MPI cannot be carried out on these nuts since they are made out of A286 CRES, which is a non-magnetic grade. Could you please check this?
Hopefully, PFC mentions FPI, which is consistent with material grade.
Could you please check if we have MPI or FPI on Acceptance Test Report (if there is an existing one)?
Rivet holes dimension:
There is a mistake in EN3750: this dimension is equal to diameter “5 0/+0,2 mm”.
For anchor nut diameter range from 3 to 6 mm, rivet hole dimension is generally 2,5 mm 0/+0,2 mm.
It should be great to correct EN3750 in that way. Hopefully, actual rivet hole dimensions are compliant to 2,5 0/+0,2 mm requirement.
Reusability test over 5 cycles at ambient temperature:
Seating torque written down in QTR is 1,24 N.m instead of 2,4 N.m.
QTR, “SUMMARY OF RESULTS”:
Push-out test: we do have a requirement of 360 N minimum and this test is compliant (see p.28).
At page 28, clause 6.6, we can read: “Not applicable on fixed nuts”.
It should be: not applicable to corner nuts.
What are your thoughts?
Many thanks in advance
Best regards, Julien
M. Gauther,
QTR, NDT section: MPI cannot be carried out on these nuts since they are made out of A286 CRES, which is a non-magnetic grade. Could you please check this? Hopefully, PFC mentions FPI, which is consistent with material grade. Could you please check if we have MPI or FPI on Acceptance Test Report (if there is an existing one)?
The raw material so we are not able to perform magnetic particle, NDT performed was Fluorescent particle inspection. QTR was updated see new document enclosed
Rivet holes dimension: There is a mistake in EN3750: this dimension is equal to diameter “5 0/+0,2 mm”. For anchor nut diameter range from 3 to 6 mm, rivet hole dimension is generally 2,5 mm 0/+0,2 mm. It should be great to correct EN3750 in that way. Hopefully, actual rivet hole dimensions are compliant to 2,5 0/+0,2 mm requirement.
I will inform ASD STAN of the mistake .
Reusability test over 5 cycles at ambient temperature: Seating torque written down in QTR is 1,24 N.m instead of 2,4 N.m.
It is a mistake in the QTR . QTR was updated
QTR, “SUMMARY OF RESULTS”: Push-out test: we do have a requirement of 360 N minimum and this test is compliant (see p.28).
At page 28, clause 6.6, we can read: “Not applicable on fixed nuts”. It should be: not applicable to corner nuts. What are your thoughts?
It was a mistake in the QTR , the test was done and it is compliant . See the QTR updated enclosed
Mrs Geneviève Lacombe
Many thanks Mrs. Richard, Mrs. Lacombe!
Approved from my side.
Best regards, Julien