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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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Original qualification data deal with EN2859D060040.
3rd party testing data deal with EN2859-060048.
Thus, we shall consider both references.
LFC Industries’ acceptance test report (EN2859D060040):
• Mfg batch size is 500 parts.
For NDT, as per ISO7689, AQL=0,065%. Thus, sample size is 200 parts (down arrow marked against sampling line in ISO7689:1988, tables 8 and 9 / as per ISO7689:2008, tables 3 and 4).
On this batch, actual sample size is 80 parts. Could you please clarify?
• Raw material: AMS6322 can be used since EN2859 calls out TR3775. However, just something to point out: LFC Industries states that raw material is in line with AMS6322L whereas DENNE certificate is compliant to AMS6322K.
• Cadmium plating: it is not really clear since PFC does mention EN2133 whereas LFC cadmium plating certificate is compliant to AMS-QQ-P-416.
PFC does mention a stress relief operation before cadmium plating, but cadmium plating CoC mentions only baking after plating. Shall we have access to stress relief data?
• Mechanical tests: units in LFC’s report are in lbf (pound-force).
Tensile test: 5,379 lbf = 23,9 kN
Double shear test: 8,389 lbf = 37,3 kN
All results are compliant.
Just for information, EN2859 (both editions: 1995 and 2008) does not require any double shear test (please see EN2859, clause 6).
NAFCO’s test report (EN2859-060048):
There is no minimum major diameter requirement. Why?
Head to shank grain flow – Macrographic examination in head: according to NAFCO report, this test is rejected. Could you please clarify?
In LFC manufacturing change letter, there is a typo: “(…) to assure mechanical and metallurgical properties meet requirements of ISO7698”.
If possible (since this is obviously a typo), could you please replace “ISO7698” by ISO7689”?
Many thanks in advance,
Best regards.
See answers in the additional data section of the report
Many thanks for answering quickly and for providing evidences and updates regarding some comments.
All is clear for me now (for the minimum major diameter requirement in NAFCO report, this is not blocking since actual values are in line with ISO5855-2 and maximum major diameter requirement, which is D1min – 0,025 = 6 – 0,035 – 0,025 = 5,940 mm, is correct).
Approved on my side.
Best regards.