Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 493942-004 found under Monitor Engine by U S Dept Of Transportation Federal. The National Stock Number assigned to this part is 2990014846026, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 493942-004.