36 CFR § 1150.44
Amendments
November 4, 2020
(a) The Executive Director may amend the citation as a matter of course before an answer is filed. A respondent may amend its answer once as a matter of course, but not later than five (5) days after the filing of the original answer. Other amendments of the citation or the answer shall be made only by leave of judge.
(b) An amended citation shall be answered within five (5) days of its service, or within the time for filing an answer to the original citation, whichever is longer.