Aerospace Exchange’s Federal Supply Groups and Classes Catalog is a helpful tool in navigating the large inventory we have at ASAP Semiconductor. Conveniently organized by FSG, each section has a long FSCs list of classifications including FSG 15 Aircraft and Airframe Structural Components, FSG 16 Aircraft Components and Accessories for you to choose from. In turn, each list of FSCs contains a wide array of NSN parts that Aerospace Exchange can ship to you.