Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 539D838P1 found under Switch Rotary by Bae Systems Controls Inc. The National Stock Number assigned to this part is 5930009121092, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 539D838P1.