29 CFR 4003.55: Opportunity to appear and to present witnesses.

(a) At the discretion of the Appeals Board, any appearance permitted under this subpart may be before a hearing officer designated by the Appeals Board.

(b) An opportunity to appear before the Appeals Board (or a hearing officer) and an opportunity to present witnesses will be permitted at the discretion of the Appeals Board. In general, an opportunity to appear will be permitted if the Appeals Board determines that there is a dispute as to a material fact; an opportunity to present witnesses will be permitted when the Appeals Board determines that witnesses will contribute to the resolution of a factual dispute.

(c) Appearances permitted under this section will take place at the main offices of PBGC, as listed on PBGC's website, www.pbgc.gov, unless the Appeals Board, in its discretion, designates a different location, either on its own initiative or at the request of the appellant or a third party participating in the appeal.