Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 840-1809 found under by Advanced Systems Div Of Comptek. The National Stock Number assigned to this part is 5865014807346, 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 840-1809.