(a)Petition for revocation. Any party to a proceeding under
this part in which a petition for modification of a mandatory safety standard
was granted by an Administrator, administratior law judge, or the Assistant
Secretary may petition that the modification be revoked. Such petition shall
be filed with the Chief Administrative Law Judge for disposition.
(b)Revocation by the Administrator. The appropriate
Administrator may propose to revoke a modification previously granted by the
Administrator, an administrative law judge, or the Assistant Secretary, by
issuing a proposed decision and order revoking the modification. Such
proposed revocation and a statement of reasons supporting the proposal must
be served upon all parties to the proceeding, and shall become final on the
30th day after service thereof unless a hearing is requested in accordance
(c) Revocation of a granted modification must be based upon a change
in circumstances or because findings which originally supported the
modification are no longer valid.
(d) Disposition of the revocation shall be subject to all procedures
of subparts C through E of this part.