QAR: Click Here
Conditions for approval required by: Julien Gauther
Certification of Aerospace Products to international quality Standards
Certification of Aerospace Products to international quality Standards
Form restricted to registered, logged in users. Please return to the home page and use the Create Account option.
In « particular remark » section, could you please replace EN5858 by ISO5858?
(Reusability test at 15 cycles: minimum breakaway torque at first cycle (0,5 N.m) is an additional requirement since ISO5858, table 9 only requires: 0,25 N.m minimum breakaway torque and 2 N.m maximum locking torque over 15 cycles.
Anyway, this additional requirement is tougher, so this is better.
Reusability test at 15 cycles, after exposure to maximum operating temperature: same remark as for 15 cycle test. This additional requirement is tougher, so this is better.)
Many thanks.
Regards.
Additional remark:
In QTP as well as in ISO5858, clause 5.1.5, the hardness of the finished nuts shall be within the limits specified in the definition document for the nut or in the material standard.
In QTR, it is written “no requirement”.
The requirement 390 – 430 HV5 (or 40 – 43 HRC) is specified in related material standards (EN2542 or EN2543).
Could you please clarify?
We can notice that hardness measurement on the fourth tested nut, at the base location is 436 HV5, which is just above the maximum limit.
Many thanks again.
Regards.
I understand the confusion related to the text at section 1.5 Hardness of the QTR, page 10 of 42, “No requirement”.
Will explain.
On the front page (1 of 42) of the QTR, standards are mentioned for qualification:
a. Qualified per product standard, EN2856 Rev: 2 Date: 01/09/2006
b. Technical specification, ISO5858 Date: 01/11/1999
The qualification therefore takes place on the basis of these two standards.
The EN2856 does not specify a requirement with regard to hardness, so “No Requirement”.
So the text in the QTR is correct!
However the ISO5858 states in section 5.1.5: “The hardness of the finished nuts shall be within the limits specified in the definition document for the nut or in the material standard”.
The definition document EN2856 does not give a requirement, so the stated values in the QTR are based on the material standard.
Reading the text above I understand that there can be confusion if you have not attended the test.
That is why I have added the following text in this report under “Particular remarks”: The EN2856:2006 does not specify a requirement for the hardness of the finished nut (No requirement as mentioned in the QTR), so it is in accordance with point 5.1.5 of the ISO5858:1999 that the hardness specified in the related material standards, as stated in EN2856:2006 page 5, should be used. These requirements are 40 – 43 HRC (390 – 430 HV5), see page 10 of 42 of the QTR”.
The incorrect value entry of the fourth nut, “Base” (436HV5) has been checked and it turned out to be a typo. This has been fixed, making the QTR revision status now rev E.
Many thanks for these detailed answers!
Clear for me now, so, approved on my side.
Best regards.