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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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In manufacturing process section, could you please replace “silver plating” by “passivation and lubrication”?
In Process Flow Chart, passivation is subcontracted to AFS MECAERO whereas on ASD-CERT website, cadmium plating is mentioned. Could you please fix this?
Another thing about passivation, could you please add CoC?
Neither adhesion test nor reusability test were carried out after exposure to maximum operating temperature. How dry-film lubrication change has been validated on this matter?
Many thanks in advance,
Regards.
Hello, Mr. Gauther,
On behalf of Mrs Genevieve Lacombe, please find below our replies to your comments :
1 – I will ask Christelle Festaud to correct it replacing silver plating by passivation and dry film. (this request will be done by e-mail today Sept 17, 2020)
2 – Regarding this point : It is a mistake done on ASD/CERT website. The EN 3720 required a dry film and not a cadmium plating.
I am not able to give you the CoC of the passivation process because the passivation operation required by EN 2491 standard was not done on this batch. The raw material of this part is FE-PA92HT( A286) so this raw material is not known to be sensitive to corrosion. As proof, a certain number of EN standards with FE-PA92HT (A286) without final surface coating do not even require a passivation treatment (Cf. EN 3377, EN 3014, EN 3019, EN 2906, etc…)
3 – test adhesion was performed in accordance with ASTM D2510 as required in EN2491 standard.
Good receipt,
Kind Regards
N. Richard
Hello Julien,
I accept Ms. Lacombe’s proposal, passivation does not affect the mechanical quality of these parts and will have no impact in use. MoS2 has a lubricating function and not anticorrosion the alloy itself is anticorrosive.
The only risk is the preparation of the support, the adhesion test confirms that the Mos2 is compliant.
the other remarks have been modified
These nuts shall be dry film lubricated as per EN2491.
Before lubrication, passivation is required by EN2491, clause 8.2. (passivation as per EN2516 in this clause).
Related process flow chart does mention passivation operation as well.
Unfortunately, passivation has been forgotten.
Thus, on quality aspects, this is problematic.
EN3720 does require passivation operation in order to remove any ferrous particles that may initiate corrosion on these nuts made of A286 stainless steel (austenitic, precipitation hardenable “family”).
So, in order to return to conformity, after technical/quality discussions at ASD-CERT, we shall propose this following process (rework process):
1- Remove dry film lubricant (chemical or mechanical stripping),
2- Carry out passivation process as per EN2516 (required by EN2491, clause 8.2),
3- Redo dry film lubrication process as per EN2491,
4- Redo some tests (the same as specified in QTP) : lubrication, visual inspection, adhesion, reusability test, dimensions,
5- Additional test suggested: salt spray test since EN2516 specifies this test as per ISO9227 for 2 hours.
To do this, a specific manufacturing route / process flow chart shall be carried out and stamped by ASD-CERT Auditor.
Could you please confirm that HFS agrees with this rework process? If not, what is your proposal on your side?
The final purpose is to get compliant parts, without taking the risk to damage them by performing unsuitable rework process and obviously, avoiding scrap.
Many thanks in advance for your support and for answering,
Best regards.
We choose to take an other batch and to perform the qualification on a new batch in order to rework the previous one , it is the reason why we have submitted a new QTR for which the passivation will be performed before dry film to be sure to be compliant ( see QTR enclosed).
Many thanks for this new QTR, I am happy with it.
On ASD-CERT website, could you just please upload valid EN9100 (and others) certificates and valid NADCAP accreditations?
We all agree with the fact that existing certificates were valid at the time of manufacturing this new batch.
Many thanks in advance,
Best regards.
The EN 9100 and NAdcap certificates have been updated
Best regards.
Many thanks Antoine, approved on my side.
Best regards.