Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U840-01 found under Reflectometer Metallic Time Doma by Etat Major De Larmee De Terre. The National Stock Number assigned to this part is 6625010035561, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U840-01.