Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SY04 9990 found under Cover Access by General Dynamics Satcom Technologies. The National Stock Number assigned to this part is 5340015875882, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SY04 9990.