Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 540042 found under by E And M Equipment Co. The National Stock Number assigned to this part is 5865002881247, 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 540042.