Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AA2540689 found under Elbow Tube by Allan Aircraft Supply Co Llc. The National Stock Number assigned to this part is 4730005293891, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AA2540689.