Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7RS900-3E found under Synchro Control Tra by Singer Co The. The National Stock Number assigned to this part is 5990007243087, 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 7RS900-3E.