Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 43887-501 found under Oscillator Noncrystal Controlled by Hamilton Standard Electronics. The National Stock Number assigned to this part is 5955002052681, 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 43887-501.