Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 283550-1661 found under Cylinder Repair Kit by Atlantic Inertial Systems Inc. The National Stock Number assigned to this part is 3040012424954, 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 283550-1661.