14 CFR 16.15 - Service of documents on the parties and the agency.
Except as otherwise provided in this part, documents shall be served as follows:
(a) Whom must be served. Copies of all documents filed with the FAA Part 16 Docket Clerk shall be served by the persons filing them on all parties to the proceeding. A certificate of service shall accompany all documents when they are tendered for filing and shall certify concurrent service on the FAA and all parties. Certificates of service shall be in substantially the following form:
I hereby certify that I have this day served the foregoing [name of document] on the following persons at the following addresses, facsimile numbers (if also served by facsimile), or email address (if served electronically in accordance with § 16.13(h)), by [specify method of service]:
(b) Method of service. Except as otherwise agreed by the parties and, if applicable, the hearing officer, the method of service is the same as set forth in § 16.13(b) for filing documents.
(d) Presumption of service. There shall be a presumption of lawful service -
(2) When a properly addressed envelope, sent to the most current address submitted under § 16.13(f), has been returned as undeliverable, unclaimed, or refused; or
(e) Date of service. The date of service shall be determined in the same manner as the filing date under § 16.13(b).