(b) A person who applies for the production of a document in the custody of an FAA employee must follow the procedure in §13.49(f). A person who applies for the attendance of an FAA employee must send the application, in writing, to the Hearing Officer setting forth the need for that employee's attendance.
(c) A witness in a proceeding under this subpart is entitled to the same fees and mileage as is paid to a witness in a court of the United States under comparable circumstances. The party at whose instance the witness is subpoenaed or appears shall pay the witness fees.
(d) Notwithstanding the provisions of paragraph (c) of this section, the FAA pays the witness fees and mileage if the Hearing Officer who issued the subpoena determines, on the basis of a written request and good cause shown, that—
(1) The presence of the witness will materially advance the proceeding; and
(2) The party at whose instance the witness is subpoenaed would suffer a serious hardship if required to pay the witness fees and mileage.