Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 381-1556-00 found under Resistor Variable W by Rockwell Collins Inc. The National Stock Number assigned to this part is 5905007031902, 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 381-1556-00.