Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 14D3500-56 GROUP 3 found under Dynamometer Run In by Taylor Dynamometer Inc. The National Stock Number assigned to this part is 4910012485209, 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 14D3500-56 GROUP 3.