Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3818165-503 found under Mechanism Assy Quad by Boeing Company The. The National Stock Number assigned to this part is 2995009431899, and the Federal Supply Class is 2995 Miscellaneous Engine Accessories Aircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3818165-503.