39 CFR 959.10: Default.

(a) If the respondent fails to file an answer within the time specified in the notice of hearing, the respondent shall be deemed in default and to have waived hearing and further procedural steps. The Judicial Officer shall thereafter issue an order without further notice to the respondent.

(b) If the respondent files an answer but fails to appear at the hearing, the presiding officer shall receive petitioner's evidence and render an initial decision.