Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 554-4143-314 found under Window Observation by Sierra Nevada Corporation. The National Stock Number assigned to this part is 9330000032789, and the Federal Supply Class is 9330 Plastics Fabricated Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 554-4143-314.