Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 221-0052-503 found under Plug Assembly Exhau by Rohr Inc. The National Stock Number assigned to this part is 2840015140643, and the Federal Supply Class is 2840 Gas Turbines And Jet Engines Aircraft Prime Moving And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 221-0052-503.