Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3520AS409 found under Window Observation by Raytheon Technical Services Company. The National Stock Number assigned to this part is 9330014615892, 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 3520AS409.