Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 500-00550-9 found under Battery Storage by Alabama Aircraft Industries Inc. The National Stock Number assigned to this part is 6140002766168, and the Federal Supply Class is 6140 Batteries Rechargeable. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 500-00550-9.