Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5 91523 found under Housing Mechanical by The Boeing Company. The National Stock Number assigned to this part is 3040006612154, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5 91523.