TCM 2 785-Arconic St Cosme en Vairais (FR) 3JRH80035M EN2882-030

3 Replies to “TCM 2 785-Arconic St Cosme en Vairais (FR) 3JRH80035M EN2882-030”

1. Comments to ASD-Cert Nr 785

   1. Material Standard used for this product is missing. Standard requires EN 3329 or EN 3330 for the Nut and EN 2543 or EN 3329 for the washer.
   The report listed only 35CD4 and 25CD4
   Please introduce the correct standard.

   2. Para 1 of the report.
   What Hardness value is required for the nut and for the washer material
   Standard requirement should be added

   3. Para 2.4 Adhesion:
   Nuts are heated at maximal temperature of use for 3h………………………
   What is the “MAX” temperature
   What is slowly cooled down; does this mean Cold down at atmosphere ??

   4. Para 3.2 and Para 3.3. De- Embrittlement curve
   A better readable curve is required.
   5. Heat treatment curves should be added

   6. First article inspection report is missing.

   Best regards
   Heinrich Hackmann
   Senior Expert
   Mechanical / General Systems
   Material & Processes; TEIM
   Airbus Defence and Space GmbH

   Reply

   1. Howmet Fixations Simmonds provided the following reply:

      QTR modified with the following points:

      – Paragraph 1.5 : hardness of the washer were introduced in the QTR
      – Paragraphe 2.4 Adhesion
      o Max use temperature at 235°C
      o Max temperature = temperature defined in the design product
      o Slowly means : cool slowly to the ambient temperature
      – Paragraph 3.2 and 3.3 no better curve available from HFS or subcontractor LISI
      – Heat treatment curves : we have added the heat treatment curves of the washer and the nuts in the QTR and in the files enclosed for better understanding
      o File “OF13512620” : austempering of the nuts
      o File “OF 13437646” : heat treatment of washers ( austenitization + tempering)

      FAI provided as well:
      – FAI see file “FAI P3265 RevA EN2882-030 »

      Regarding the link between the materials used and EN 2543 et EN 3329:

      – Raw material for the nut is 35CD4 . The raw material is supplied in accordance with our internal specification SAM0028 which refers to EN 3329 see file “SAM0028”
      – Raw material for the washer is 25CD4 . The raw material is supplied in accordance with our internal specification SAM004 which refers to EN 2543 see file “SAM004”

      Reply

      1. Philippe Canteau reviewed the reply and provided the following comments:

         1. Material Standard used for this product is missing. Standard requires EN 3329 or EN 3330 for the Nut and EN 2543 or EN 3329 for the washer. The report listed only 35CD4 and 25CD4. Please introduce the correct standard.
         OK with internal material documents from Howmet SAM00028 and SAM0004.

         2. Para 1 of the report.
         What Hardness value is required for the nut and for the washer material
         Standard requirement should be added.
         Wrong QTR added, this is the QTR for EN2753-100 product instead of EN2882-030 product which has been provided by Howmet.

         3. Para 2.4 Adhesion:
         Nuts are heated at maximal temperature of use for 3h………………………
         What is the “MAX” temperature
         What is slowly cooled down; does this mean Cold down at atmosphere ??
         OK explanation provided by Howmet and heat treatment curves provided.

         4. Para 3.2 and Para 3.3. De- Embrittlement curve
         A better readable curve is required.
         OK no better curve

         5. Heat treatment curves should be added
         OK Heat treatment curves provided by Howmet

         6. First article inspection report is missing.
         OK FAI provided by Howmet

         Reply