Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M3900 found under Housing Magneto by Unison Industries Llc. The National Stock Number assigned to this part is 2925015221134, and the Federal Supply Class is 2925 Engine Electrical System Components Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M3900.