Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KC4906LD found under by Talk A Phone Co. The National Stock Number assigned to this part is 5831013149443, and the Federal Supply Class is 5831 Intercommunication And Public Address Systems Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KC4906LD.