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Certification of Aerospace Products to international quality Standards
Certification of Aerospace Products to international quality Standards
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Do we have any NADCAP accreditations for HT, MTL and NDT?
On ASD-CERT website, we have only NADCAP CP certificate.
After checking on eAuditNet website, Paolo Astori is NADCAP accredited for HT, CP and NDT.
What about MTL?
In PFC, NDT seems to be carried out before heat treating, crimping and tapping.
These manufacturing operations may generate cracks or any other external defects (laps, seams).
Usually, NDT (MPI or FPI) are performed after forming, tapping, crimping, and heat treating operations, just before surface treatment.
How do we make sure that tapping, crimping and heat treatment operations have not generated external defects?
To illustrate, ISO5858 clause 5.14, note C: “Inspection to be carried out before coating of the surface or after removal of the surface coating”.
It means: just before coating operation.
ISO5858, annex A states:
“The following surface discontinuities are permissible:
– Laps or seams produced in the drawing process and seams produced in the machining process (a);
– Laps produced in the stamping process (c);
– Laps produced in the clinching process (c);
– Marks caused by the forming tool used to ensure internal locking (d).
The location and appearance of these discontinuities are illustrated in Figure A.1.
These discontinuities shall not:
– result in any abrupt change of area;
– be located within the self-locking zone (apart from c or d);
– be deeper than those values specified in Table 14.”
FPI: what is the sample size?
Dry film lubrication: which area has been coated? Shall we have some pictures of these nuts? (Difficult to see something on marking pictures, except marking of course).
Many thanks in advance,
Best regards.
Dear Julien,
I send you the reply to your questions.
Question: Do we have any NADCAP accreditations for HT, MTL and NDT?
On ASD-CERT website, we have only NADCAP CP certificate.
After checking on eAuditNet website, Paolo Astori is NADCAP accredited for HT, CP and NDT.
What about MTL?
Reply: See attached valid Nadcap Certificates for HT, CP and NDT. Currently we are not Nadcap approved for MTL (Material Testing Laboratory)
Question: In PFC, NDT seems to be carried out before heat treating, crimping and tapping.
These manufacturing operations may generate cracks or any other external defects (laps, seams).
Usually, NDT (MPI or FPI) are performed after forming, tapping, crimping, and heat treating operations, just before surface treatment.
How do we make sure that tapping, crimping and heat treatment operations have not generated external defects?
To illustrate, ISO5858 clause 5.14, note C: “Inspection to be carried out before coating of the surface or after removal of the surface coating”.
It means: just before coating operation.
ISO5858, annex A states:
“The following surface discontinuities are permissible:
– Laps or seams produced in the drawing process and seams produced in the machining process (a);
– Laps produced in the stamping process (c);
– Laps produced in the clinching process (c);
– Marks caused by the forming tool used to ensure internal locking (d).
The location and appearance of these discontinuities are illustrated in Figure A.1
These discontinuities shall not:
– result in any abrupt change of area;
– be located within the self-locking zone (apart from c or d);
– be deeper than those values specified in Table 14.”
FPI: what is the sample size?
Reply: You are correct. NDT shall be perfomed after heat treatment and any mechanical operations. For this P/N, NDT inspection is required for qualification batch only (see par. ISO5858 5.1.4, column Test category). For production batches NDT inspection is not required. So the NDT listed on manufacturing flow chart is not required but it is our requirement only.
Question: Dry film lubrication: which area has been coated? Shall we have some pictures of these nuts? (Difficult to see something on marking pictures, except marking of course).
Reply: DFL is apply on all surfaces of nut element only (see picture as reference in section ” QualificationTest Report” attached).
Best Regards
Piero
Dear Piero,
Many thanks for replying.
NADCAP => it is clear.
DFL => it is clear.
For discontinuities, as you said, ISO5858 requires NDT only for qualification.
Nevertheless, for production batches, how can we make sure that operations done after NDT (tapping, crimping and heat treatment) are not detrimental? Is there any additional test to see if these operations have generated laps or seams or cracks?
In case of qualification batch, what is the applicable manufacturing route?
Many thanks again,
Best regards.
Julien
Dear Julien,
I send you the reply to your question prepared by Stefano Giacometti – Product Engineer of Paolo Astori.
REPLY: We are used to apply always an NDT inspection after forming to check the absence of defects due to the raw material. Then, each process has a control plan to ensure that everything was correctly done. Considering our high experience (more than 75 years of nuts manufacturing), the risk analysis and acceptance tests required we think that there is no any potential risk to produce non conforming parts for this type of nut.
Qualification batch has been manufactured with the same router (no defects found) and it has been managed adding the NDT operation before coating.
Best Regards
Piero
Dear Piero,
Thank you for replying.
ISO5858 should specify NDT for Acceptance as well as it is for Qualification.
Moreover, NDT shall always be carried out just before surface treatment, after machining, tapping, crimping, heat treatment and any operations that may initiate external defects to my opinion.
Anyway, in that case, I am happy with these answers.
Best regards.
Julien