Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AC20C18 109 found under Resistor Voltage Sensitive by Aircontrol Technologies. The National Stock Number assigned to this part is 5905010273920, 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 AC20C18 109.