Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HA4849A9CHANGEA found under Oscillator Subassembly by Dowty Industrial Corp. The National Stock Number assigned to this part is 5955003348823, and the Federal Supply Class is 5955 Oscillators And Piezoelectric Crystals. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HA4849A9CHANGEA.