(a) General rule. The Board may review a ruling of the ALJ prior to the certification of the record to the Board only in accordance with the procedures set forth in this section and § 263.23.

(b) Scope of review. The Board may exercise interlocutory review of a ruling of the ALJ if the Board finds:

(1) The ruling involves a controlling question of law or policy as to which substantial grounds exist for a difference of opinion;

(2) Immediate review of the ruling may materially advance the ultimate termination of the proceeding;

(3) Subsequent modification of the ruling at the conclusion of the proceeding would be an inadequate remedy; or

(4) Subsequent modification of the ruling would cause unusual delay or expense.

(c) Procedure. Any request for interlocutory review must be filed by a party with the ALJ within ten days of the ruling and must otherwise comply with § 263.23. Any party may file a response to a request for interlocutory review in accordance with § 263.23(d). Upon the expiration of the time for filing all responses, the ALJ will refer the matter to the Board for final disposition.

(d) Suspension of proceeding. Neither a request for interlocutory review nor any disposition of such a request by the Board under this section suspends or stays the proceeding unless otherwise ordered by the ALJ or the Board.