Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4BA found under Indicator Turn And Slip by Fl Aerospace Corp Janitrol Aero. The National Stock Number assigned to this part is 6610006634132, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B4BA.