Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5739 found under Cooler Air Electronic Equipment by Lytron Incorporated. The National Stock Number assigned to this part is 5999012354574, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5739.