Defining job roles

The AS9100 audit of the QMS will not only include the standard, but also how you have implemented the processes of the QMS in order to provide products and services that meet customer needs. This will include all customer and legal requirements that are applicable to your ability to provide products and services as they are included into the QMS. So, if you have a customer or legal requirement to define the aircraft certification roles, then this is part of your QMS and therefore part of the AS9100 audit of your QMS.

You can read more about documenting roles in the QMS in the article: How to document roles and responsibilities according to AS9100 Rev D, https://advisera.com/9100academy/blog/2018/08/28/how-to-document-roles-and-responsibilities-according-to-as9100-rev-d/

If you are looking for a guide to implement the standard, our book might help:  Applying AS9100 Rev D, https://advisera.com/books/applying-as9100-rev-d/