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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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1st NDT is carried out after nut forming.
2nd NDT is carried out after passivation. Generally, NDT is done after any surface finishing.
As per ASTM E1417, we have this requirement: “6.8.2 Surface Coatings—All coatings and other surface conditions, such as, paint, plating, corrosion, etc. shall be removed from the area to be examined prior to penetrant examination. The penetrant examination shall precede any surface finish, such as anodize, except for inservice parts that may be examined without removing the anodize.”
FPI requires the use of some products (penetrant, developer…). How can we make sure that these kind of products are not detrimental for passivation?
After FPI, parts shall be cleaned. Does cleaning operation affect passivation performance?
Do we have the same study as this done for qualification 981?
What is the test bolt reference used for carrying out permanent set test? (material and coating)
Wrench feature test: how many cycles were carried out?
Self-locking torque at ambient temperature after 650°C baking: could we have more details about load calculations?
Many thanks
Best regards.
1st NDT is carried out after nut forming.
2nd NDT is carried out after passivation. Generally, NDT is done after any surface finishing.
As per ASTM E1417, we have this requirement: “6.8.2 Surface Coatings—All coatings and other surface conditions, such as, paint, plating, corrosion, etc. shall be removed from the area to be examined prior to penetrant examination. The penetrant examination shall precede any surface finish, such as anodize, except for inservice parts that may be examined without removing the anodize.”
FPI requires the use of some products (penetrant, developer…). How can we make sure that these kind of products are not detrimental for passivation?
After FPI, parts shall be cleaned. Does cleaning operation affect passivation performance?
–>All products used during FPI inspection are according to AMS2644 specification (Inspection material, penetrant). We also perfomed internal tests on our parts to verify if FPI materials and final cleaning chemical products (NaOH based) could be detrimental for surface CP finishing such as passivation. No difference has been detected before and after FPI complete process.
Do we have the same study as this done for qualification 981?
-> Yes, the raw material is always A286.
What is the test bolt reference used for carrying out permanent set test? (material and coating)
– -> We used A286 test bolt, silver plated + syntetic oil with threads according to ISO5855-2 with the exception of PD tolerances listed on ISO8642 Table 6.
Wrench feature test: how many cycles were carried out?
– -> 15 cycles as required on EN3004 par. 5.4.2.
Self-locking torque at ambient temperature after 650°C baking: could we have more details about load calculations?
– -> We have calculated the elongation of the bolt according to Equation e =0.002542* L (e= bolt elongation, L= spacer length) and then applied the torque necessary to get this elongation value on the assembly. We have repeated this procedure for 5 times before baking.
Dear Piero,
Thank you for these additional explanations.
Approved on my side.
Best regards.
Julien