Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17-2878-1B found under Heating Element Electrical Nonim by Tayco Engineering Inc. The National Stock Number assigned to this part is 4520012507086, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17-2878-1B.