Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FR 5900A found under Holder Printed Circ by Dynair Electronics Inc. The National Stock Number assigned to this part is 5998011327288, and the Federal Supply Class is 5998 Electrical And Electronic Assemblies Boards Cards And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FR 5900A.