12 C.F.R. § 6.6
(2) Provisions applicable to undercapitalized, significantly undercapitalized, and critically undercapitalized national banks or Federal savings associations. Immediately upon receiving notice or being deemed to have notice, as provided in § 6.3, that the national bank or Federal savings association is undercapitalized, significantly undercapitalized, or critically undercapitalized, the national bank or Federal savings association shall become subject to the provisions of section 38 of the FDI Act:
(4) Additional provisions applicable to critically undercapitalized national banks or Federal savings associations. In addition to the provisions of section 38 of the FDI Act described in paragraphs (a)(2) and (3) of this section, immediately upon receiving notice or being deemed to have notice, as provided in § 6.3, that the national bank or Federal savings association is critically undercapitalized, the national bank or Federal savings association shall become subject to the provisions of section 38 of the FDI Act: