Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 23TDR4A found under Synchro Differentia by Navair And Navsea Managed. The National Stock Number assigned to this part is 5990006776492, 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 23TDR4A.