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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?
NDT: sampling carried out is 315 parts.
Mfg batch size is 10355 nuts.
As per EN3004, discontinuities have AQL = 0,065%
For this AQL, we have an up arrow marked against sample size 315 to reach 200 parts.
So, 200 parts should have been inspected instead of 315.
(See ISO2859-1, table II-A or ANSI/ASQ Z1.4, normal inspection for both).
However, this is just a remark because sample size applied is tougher than required => agreed.
Many thaks in advance,
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.
NDT: sampling carried out is 315 parts.
Mfg batch size is 10355 nuts.
As per EN3004, discontinuities have AQL = 0,065%
For this AQL, we have an up arrow marked against sample size 315 to reach 200 parts.
So, 200 parts should have been inspected instead of 315.
(See ISO2859-1, table II-A or ANSI/ASQ Z1.4, normal inspection for both).
However, this is just a remark because sample size applied is tougher than required => agreed.
-> Yes, I agree.
Fine for me, many thanks.
Approved on my side.
Best regards.
Just a correction on my own comment: 2nd NDT is carried out after passivation. Generally, NDT is done BEFORE any surface finishing.
Anyway, approved on my side