Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 577HN400-1 found under by Raytheon Technical Services Company. The National Stock Number assigned to this part is 5865015474390, and the Federal Supply Class is 5865 Electronic Countermeasures Counter-Countermeasures And Quick Reaction Capability Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 577HN400-1.