Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28-81 found under Lamp Incandescent by Drs Power And Control Technologies. The National Stock Number assigned to this part is 6240001433049, and the Federal Supply Class is 6240 Electric Lamps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28-81.