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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, clause 1.4.1
How ARCONIC succeeded in doing magnetic particle inspection on these nuts?
A286 (Z6 NCT 25) is a non-magnetic stainless steel.
In my opinion, fluorescent penetrant inspection is necessary for detecting any surface discontinuities on these nuts due to type of material.
QTR, clauses 6.1.1 and 6.1.2
Why do we have only 4 nuts tested?
From my point of view, ISO5858, clause 5.6.1 states that 8 nuts shall be tensile tested at 80% and 8 nuts shall be tensile tested at 100% for qualification (after being exposed to the maximum operating temperature for 6 h, as note “h” says).
QTR, clause 6.3.2.1.
In ISO5858, we have a note “m” to say that locking torque test over 15 cycles is lowered to 5 cycles for this kind of nut. So, we consider 5 cycles test instead of 15, no issue about that.
Why do we have 0,7 N.m for minimum breakaway torque at 1st cycle?
This value is applicable for the single-cycle test at ambient temperature.
Many thanks in advance,
Best regards.
Julien
QTR, clause 6.3.2.2.
Why do we have 0,7 N.m for minimum breakaway torque at 1st cycle?
This value is applicable for the single-cycle test at ambient temperature.
1.4.1 : I agree that is FPI which is necessary for detecting surface discontinuities on A286 part. This is a typoo error, QTR will be corrected.
QTR Clauses 6.1.1 & 6.1.2 : in the QTR tests were performed on 8 nuts, 4 nuts at room temperature at 80 % and 4 nuts after baking at the maximum temperature at 100 %. ISO 5858 is confusing because it request 8 nuts, quantity of sampling is not very clear we can be interpreted 4 samples for each tensile test, total 8 samples for each tests; not clear. The test report in order to avoid any interpretation test were performed on 8 nuts at room temperature at 80 % and 8 nuts at 100 % after baking. The QTR will be updated.
1.4.1 : I agree that is FPI which is necessary for detecting surface discontinuities on A286 part. This is a typoo error, QTR will be corrected.
QTR Clauses 6.1.1 & 6.1.2 : in the QTR tests were performed on 8 nuts, 4 nuts at room temperature at 80 % and 4 nuts after baking at the maximum temperature at 100 %. ISO 5858 is confusing because it request 8 nuts, quantity of sampling is not very clear we can be interpreted 4 samples for each tensile test, total 8 samples for each tests; not clear. The test report in order to avoid any interpretation test were performed on 8 nuts at room temperature at 80 % and 8 nuts at 100 % after baking. The QTR will be updated.
On QTR 8257B, clauses 6.3.2.1 and 6.3.2.2, we still have 0,7 N.m for minimum breakaway torque at 1st cycle.
This value is applicable for the single-cycle test at ambient temperature if I am not wrong.
Could you please confirm/clarify?
Thank you.
Regards.
Julien
Thank you very much for your speed.
It is clear for me now.
Qualification approved on my side.
Best regards.
Julien
See QTR N°8257C in QTR section.