Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 520S0003-1 found under Fitting by Air Cruisers Company Llc. The National Stock Number assigned to this part is 4240013391769, and the Federal Supply Class is 4240 Safety And Rescue Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 520S0003-1.