I found in the Airbus AMM in the Component Location section the acronym FIN (Function Item Number) and I wonder if it's Airbus way to refer to a part number that is not an expendable part (They use P/N for expandable componentes mentioned in the AMM tasks procedures). I was looking for the same acronym for Boeing A/C but I could find anything. So I wonder if there's a general naming for A/C components identification.
Thank you in advance.
PD: I'm a software developer getting started into the Aircraft MRO business domain.