N.C. Gen. Stat. § 157-21
All property of the authority shall be exempt from levy and sale by virtue of an execution, and no execution shall issue against the same. No judgment against the authority shall be a charge or lien against its property, real or personal. The provisions of this section shall not apply to or limit the right of obligees of any mortgage of the authority provided for in G.S. 157-17, after foreclosure sale thereunder, to obtain a judgment or decree for any deficiency due on the indebtedness secured thereby and to issue execution on the credit of the authority. Such deficiency judgment or decree shall be a lien and charge upon the property of the authority, which may be levied on and sold by virtue of an execution or other judicial process for the purpose of satisfying such deficiency judgment or decree.
N.C. Gen. Stat. § 157-21