49 C.F.R. § A to Part 1122
(a) After conducting sufficient investigation and prior to submitting recommendations and a summary of findings to the Board, the Investigating Officer, in his or her discretion, may inform the parties under investigation (orally or in writing) of the proposed recommendations and summary of findings that may be submitted to the Board. If the Investigating Officer so chooses, he or she shall also advise the parties under investigation that they may submit a written statement, as explained below, to the Investigating Officer prior to the consideration by the Board of the recommendations and summary of findings. This optional process is in addition to, and does not limit in any way, the rights of parties under investigation otherwise provided for in this part.
(b) Unless otherwise provided for by the Investigating Officer, parties under investigation may submit a written statement, as described above, within 14 days after of being informed by the Investigating Officer of the proposed recommendation(s) and summary of findings. Such statements shall be no more than 20 pages, not including any supporting data, evidence, and verified statements that may be attached to the written statement, double spaced on 81/2 by 11 inch paper, setting forth the views of the parties under investigation of factual or legal matters or other arguments relevant to the commencement of a Formal Board Proceeding. Any statement of fact included in the submission must be sworn to by a person with personal knowledge of such fact.
(c) Such written statements, if the parties under investigation choose to submit, shall be submitted to the Investigating Officer. The Investigating Officer shall provide any written statement(s) from the parties under investigation to the Board at the same time that he or she submits his or her recommendations and summary of findings to the Board.
49 C.F.R. §A to Part 1122