§  1.263   Proposed findings and conclusions.

   (a) Each party to the proceeding may file proposed findings of fact and
   conclusions, briefs, or memoranda of law: Provided, however, That the
   presiding officer may direct any party other than Commission counsel to
   file proposed findings of fact and conclusions, briefs, or memoranda of
   law. Such proposed findings of fact, conclusions, briefs, and memoranda
   of law shall be filed within 20 days after the record is closed, unless
   additional time is allowed.

   (b) All pleadings and other papers filed pursuant to this section shall
   be accompanied by proof of service thereof upon all other counsel in
   the proceeding; if a party is not represented by counsel, proof of
   service upon such party shall be made.

   (c) In the absence of a showing of good cause therefor, the failure to
   file proposed findings of fact, conclusions, briefs, or memoranda of
   law, when directed to do so, may be deemed a waiver of the right to
   participate further in the proceeding.

   (5 U.S.C. 557)