5 C.F.R. § 1209.5 : Administrative Personnel — MERIT SYSTEMS PROTECTION BOARD — ORGANIZATION AND PROCEDURES — PRACTICES AND PROCEDURES FOR APPEALS AND STAY REQUESTS OF PERSONNEL ACTIONS ALLEGEDLY BASED ON WHISTLEBLOWING OR OTHER PROTECTED ACTIVITY — APPEALS — Time of filing

(a) General rule. The appellant must seek corrective action from the Special Counsel before appealing to the Board unless the action being appealed is otherwise appealable directly to the Board and the appellant has elected a direct appeal. (See § 1209.2 regarding election of remedies under 5 U.S.C. 7121(g) ). Where the appellant has sought corrective action, the time limit for filing an appeal with the Board is governed by 5 U.S.C. 1214(a)(3). Under that section, an appeal must be filed:
(1) No later than 65 days after the date of issuance of the Special Counsel's written notification to the appellant that it was terminating its investigation of the appellant's allegations or, if the appellant shows that the Special Counsel's notification was received more than 5 days after the date of issuance, within 60 days after the date the appellant received the Special Counsel's notification; or,
(2) At any time after the expiration of 120 days, if the Special Counsel has not notified the appellant that it will seek corrective action on the appellant's behalf within 120 days of the date of filing of the request for corrective action.
(b) Equitable tolling; extension of filing deadline. The appellant's deadline for filing an individual right of action appeal with the Board after receiving written notification from the Special Counsel that it is terminating its investigation of his or her allegations is subject to the doctrine of equitable tolling, which permits the Board to extend the deadline where the appellant, despite having diligently pursued his or her rights, was unable to make a timely filing. Examples include cases involving deception or in which the appellant filed a defective pleading during the statutory period.
(c) Appeals after a stay request. Where an appellant has filed a request for a stay with the Board without first filing an appeal of the action, the appeal must be filed within 30 days after the date the appellant receives the order ruling on the stay request. Failure to timely file the appeal will result in the termination of any stay that has been granted unless a good reason for the delay is shown.

5 C.F.R. § 1209.5

55 FR 28592, 7/12/1990, as amended at 59 FR 31110, 6/17/1994; 62 FR 59993, 11/6/1997; 77 FR 62374, 10/12/2012