Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AY503-75A1 found under Synchro Receiver by Honeywell Aerospace. The National Stock Number assigned to this part is 5990007229698, 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 AY503-75A1.