Even experts need a reference point to pick the right replacement parts out of the thousands of fasteners, electrical interconnects, and structural assemblies that comprise a modern airframe. This is the reasoning behind the creation of an aircraft Illustrated Parts Catalog (IPC), a document prepared by an Original Equipment Manufacturer (OEM) that breaks down every component found on a particular model. This guide will detail what one can expect to find in an IPC and how it serves as such a vital tool for accurate procurement and maintenance activities.