N.C. Gen. Stat. § 47-20.3

To be validly registered pursuant to G.S. 47-20, a mortgage, deed of trust or conditional sales contract, or any combination of these, of both personal property and real property must be registered pursuant to the provisions of G.S. 47-20.1 for the real property covered by the instrument and pursuant to the provisions of G.S. 47-20.2 for the personal property covered by the instrument, and in each case the registration must be indexed in the records designated for the particular type of property involved.