Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TY S171A MOD found under Switch Assembly by Celanese Plastics Co. The National Stock Number assigned to this part is 5930012675120, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TY S171A MOD.