Autoclave and Oven Calibration per AMS2750 F

AMS2750 Ovens and autoclaves

The AMS2750 is one of the most important specifications in the aerospace industry. This article will help you understand its requirements and the way to achieve them.

What is AMS2750 F PYROMETRY ?

AMS2750 F is one of the most important standards used in aerospace industry to manage ovens and autoclaves. It is owned by SAE (Society of Automotive Engineers) but also referenced in Nadcap checklists as well as by most OEMs such as Airbus and Boeing. 

This standard scope is « Pyrometry » and the latest revision is F published in February 2020. The document can be obtained from SAE. While it is a complete re-write, the soul of this specification remains unchanged and still revolves around its fundamental requirements related to SAT, TUS and thermocouple control.

THREATS & OPPORTUNITIES ?

Like everything, the AMS2750F specification has threats and opportunities. If well managed, demonstrating compliance to its requirements will not only ensure customer/auditor satisfaction but also will give them confidence in the rest of your QMS (quality management system) and your operations in general. This is simply because:

    • it is something both parties are knowledgeable about (unlike in-house know-how or customer requirements you need to explain to the auditor)
    • the requirements re black or white (unlike some quality or customer requirements that are prone for interpretation)
    • it requires technical skills to understand and manage the requirements

Among the opportunities there is also the possibility of reducing the cost of calibration (in-house or external) and the cost of losses (scrap, rejects, reworks, etc) by having a better understanding of the requirements without doing over-quality.

The threats are much higher in proportions : considering ovens and autoclaves are used in sensitive manufacturing processes or special processes, a failure to demonstrate compliance will result in a loss of confidence. If the compliance of the product is questioned, then it is even worst as there is almost no mean to verify the parts.

THE AMS2750F STRUCTURE ?

Unfortunately you don’t read this specification like a book. For example, we will see at a later stage the SAT (System Accuracy Check) in more details but we can say it is a calibration that need to be done on the furnace sensors. If you are interested in SAT, you will then have to read the different chapters of the AMS and from each of them gather the requirements that apply to SAT and assemble everything like a puzzle.

Secondly, this specification is made to cover a large scope of ovens, autoclaves, furnaces, baths, freezers that range from -60°c till +600°c. It is also covering the instruments used in the process, in the field calibration, those used to calibrate field instruments, etc. As you may appreciate, there are lot of requirements that are not applicable to you (unless you are trainer or calibration company). Therefore it is important to know these N/A items to quickly navigate in this specification.

Having said that, once you know where to fetch for the information, it is straight forward. In this post, we will follow the same structure.

One advice about AMS2750F

If I had only one advice about this specification, it will be to gather all the requirements that are applicable to your organization into one single document. Call it Pyrometry Procedure or any other name. It will be a huge help and it will avoid you deep dives into the AMS2750F every time you face a question.

CHAPTER 1 : Thermocouples

 

Conclusion

As a conclusion, the AMS2750F is a structured specification that bring clarity to the management of ovens and autoclaves. It is going in much details in some instances but these are good help to ensure stable manufacturing processes.

 

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