34 C.F.R. § 668.121
(b) In the event that the initial decision of the hearing official is not appealed within the time limit specified in § 668.119(a), the initial decision automatically becomes the final decision of the Department.
(Authority: 20 U.S.C. 1094)
[52 FR 30115, Aug. 12, 1987; 52 FR 46354, Dec. 7, 1987, as amended at 57 FR 47753, Oct. 19, 1992]