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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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Dimensions test: could you please clarify which standard has been applied for sampling?
On inspection report, we have Mfg batch size: 2568 parts, sample size 64/8/200 and Accept 0 / Reject 1.
Connection between these data and EN3297 table 4 is not obvious.
Reusability – 3 cycle test:
Seating torque = 66.4 in.lbf = 7.5 N.m
Max locking torque = 22.1 in.lbf = 2.5 N.m
Min breakaway torque – 1st cycle of three cycle test = 5.0 in.lbf = 0.56 N.m
Min breakaway torque – 2nd cycle of three cycle test = 4.0 in.lbf = 0.44 N.m
Min breakaway torque – 3rd cycle of three cycle test = 2.8 in.lbf = 0.31 N.m
For future qualification/renewal, shall we have SI units?
In these reports, it is written “IN LBS”, but I assume it can be related to in lbf.
What is sample size for FPI?
Inspection report mentions that material is conform to EN2404 whereas raw material certificate (CARPENTER) is conform to AMS5662, ALCOA QAS 6-1 and AMS5663 (capable of).
EN2404 is inactive for new design and has been replaced by EN4376 and EN4377.
If we consider EN4376 standard (because this is the same heat treatment delivery condition, which is solution and precipitation heat treated), we may have some difference in term of requirements.
For example, EN4376 requires ultrasonic inspection: EN4376 (line 61) calls out EN4700-2 which specifies ultrasonic inspections as per EN4050-3, class 3.
Raw material certificate does not seem to state that ultrasonic inspection has been done.
Could you please check this?
Many thanks in advance,
Regards,
Julien
Please find below the reply of Dave Satow from Howmet Fastening Systems :
• Dimensions test: could you please clarify which standard has been applied for sampling?
– I checked with our quality department and the sample size was based upon the ANSI/ASQCZ1.4 requirements.
• On inspection report, we have MFG batch size: 2568 parts, sample size 64/8/200 and Accept 0 / Reject 1. Connection between these data and EN3297 table 4 is not obvious.
– I checked with our quality department and the sample size was based upon the ANSI/ASQCZ1.4 requirements.
• What is sample size for FPI? 5 pieces per EN3297 Table 7, Sample size “B”
• Inspection report mentions that material is conform to EN2404 whereas raw material certificate (CARPENTER) is conform to AMS5662, ALCOA QAS 6-1 and AMS5663 (capable of). EN2404 is inactive for new design and has been replaced by EN4376 and EN4377. If we consider EN4376 standard (because this is the same heat treatment delivery condition, which is solution and precipitation heat treated), we may have some difference in term of requirements. For example, EN4376 requires ultrasonic inspection: EN4376 (line 61) calls out EN4700-2 which specifies ultrasonic inspections as per EN4050-3, class 3. Raw material certificate does not seem to state that ultrasonic inspection has been done. Could you please check this?
– Working with our purchasing department and material vendor to see if they can dual certify the material.
• What is sample size for FPI? 5 pieces per EN3297 Table 7, Sample size “B”
=> As per EN3297 clause 5.5.3, FPI sampling for Qualification is 3 and for Acceptance, it shall in line with tables 3 & 4.
If we look at tables 3 & 4, AQL = 0,065%, mfg batch size = 2568 parts, we have 125 to check.
Moreover, EN3297 table 7 column B is for destructive test. FPI is not destructive.
Could you please clarify again?
=> Waiting for anwser about raw material.
Many thanks in advance,
Regards.
The manufacturer provided a new raw material certificate (see section Manufacturing Conformity Certificate section) with the following amendments:
EN4378 Spec was added as “chemistry only” due to capability testing not meeting.
Material meets all as-shipped requirements, including ultrasonic.
Many thanks for this material certificate amendment.
We still have remaining question about FPI.
Hope we will get an answer shortly.
Best regards.
Material Cert uploaded to Report
FPI for Batch acceptance is done on 100% of the batch. qualification is carried out on a smaller sample size.
Many thanks Phil.
Approved on my side.
Best regards.
I’m just recording here complementary information provided by the manufacturer:
As per EN3297 clause 5.5.3, FPI sampling for Qualification is 3 and for Acceptance, it shall in line with tables 3 & 4.
If we look at tables 3 & 4, AQL = 0,065%, mfg batch size = 2568 parts, we have 125 to check.
=> Based upon our inspection requirements 200 pieces were checked.
Moreover, EN3297 table 7 column B is for destructive test. FPI is not destructive.
=> I am checking with our NDT department on this one…
Recording here complementary information provided by the manufacturer:
After reviewing our internal testing specification and historical reports it looks like we have always tested 5 pieces for our NDT evaluation.
I assume we have always considered this as a destructive test since the creation of our testing specification.