29 CFR § 26.1 - Purpose and scope.
(a) This part contains the rules of practice of the Administrative Review Board (ARB) when it is exercising its authority as described in paragraph (b) of this section. These rules shall govern all appeals and proceedings before the ARB except when inconsistent with a governing statute, regulation, or executive order, in which event the latter shall control.
(b) The ARB has authority to act as the authorized representative of the Secretary of Labor in review or on appeal of decisions and recommendations as provided in Secretary's Order 01–2020 (or any successor to that order). The ARB shall act as fully and finally as the Secretary of Labor concerning such matters, except as provided in Secretary's Order 01–2020 (or any successor to that order).