Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6661-1256-1 found under Transmitter Wind Direction And S by Sutron Corporation. The National Stock Number assigned to this part is 6660015198014, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6661-1256-1.