Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PA9-57-1 found under Line Section Radio Frequency Transmission by General Dynamics Satcom Technologies. The National Stock Number assigned to this part is 5985005289868, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PA9-57-1.