Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21C846 1 found under Rotor Synchro by Tecstar Electro Systems Inc. The National Stock Number assigned to this part is 5990011108978, and the Federal Supply Class is 5990 Synchros And Resolvers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21C846 1.