I would think these would be limited to critical characteristics. As far as The results of process studies shall be documented with specifications where applicable for means of production, measurement and test, and maintenance instructions.
the sentence sorta sucks. But I read it to say that your process studies have to drive production, measurement and test, and maintenance considerations.
...shall include objectives for process capability, reliability, maintainability and availability, as well as acceptance criteria...
I would think these would be developed early on. I can only think they want to ensure these aspects documented.
Does it mean we shall do capability studies on every part; every dimension?
I don't think so. Critical characteristics.