Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E-1-577D found under Resistor Variable W by Heico Ohmite Llc. The National Stock Number assigned to this part is 5905010952219, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E-1-577D.