Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number UA539800-2 found under Cooler Lubricating by Triumph Thermal Systems Inc. The National Stock Number assigned to this part is 2935013249087, and the Federal Supply Class is 2935 Engine System Cooling Components Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like UA539800-2.