(a) General rule. When a document is required under this part to be filed within a prescribed period of time, an extension of time to file will be granted only upon good cause shown and only when the request for an extension is made before the expiration of the time prescribed. The request for an extension shall be in writing and state why additional time is needed and the amount of additional time requested. The filing of a request for an extension shall stop the running of the prescribed period of time. When a request for an extension is granted, the PBGC shall notify the person requesting the extension, in writing, of the amount of additional time granted. When a request for an extension is denied, the PBGC shall so notify the requestor in writing, and the prescribed period of time shall resume running from the date of denial.

(b) Disaster relief. When the President of the United States declares that, under the Disaster Relief Act of 1974, as amended (42 U.S.C. 5121, 5122(2), 5141(b)), a major disaster exists, the Director of the PBGC (or his or her designee) may, by issuing one or more notices of disaster relief, extend the due date for filing a request for reconsideration under § 4003.32 or an appeal under § 4003.52 by up to 180 days.