Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DTU-31(D-2) B found under Trainer Subassembly by Aeronautical And Support Equipment. The National Stock Number assigned to this part is 6920012884911, 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 DTU-31(D-2) B.