Upon receipt by the Commission of a petition under § 207.10 or receipt of notice that the administering authority has commenced an investigation under section 702(a) or section 732(a) of the Act, the Director shall, as soon as practicable after consultation with the administering authority, institute an investigation and commence the preliminary phase of the investigation under section 703(a) or section 733(a) of the Act and shall publish a notice to that effect in the Federal Register.