29 CFR § 4041.45 - Distress termination notice.
(a) General rule. The plan administrator must file with the PBGC a PBGC Form 601, Distress Termination Notice, Single-Employer Plan Termination, with Schedule EA-D, Distress Termination Enrolled Actuary Certification, that has been completed in accordance with the instructions thereto, on or before the 120th day after the proposed termination date.
(b) Participant and benefit information—(1) Plan insufficient for guaranteed benefits. Unless the enrolled actuary certifies, in the Schedule EA-D filed in accordance with paragraph (a) of this section, that the plan is sufficient either for guaranteed benefits or for benefit liabilities, the plan administrator must file with the PBGC the participant and benefit information described in PBGC Form 601 and the instructions thereto by the later of—
(i) 120 days after the proposed termination date, or
(2) Plan sufficient for guaranteed benefits or benefit liabilities. If the enrolled actuary certifies that the plan is sufficient either for guaranteed benefits or for benefit liabilities, the plan administrator need not submit the participant and benefit information described in PBGC Form 601 and the instructions thereto unless requested to do so pursuant to paragraph (c) of this section.
(3) Effect of failure to provide information. The PBGC may void the distress termination if the plan administrator fails to provide complete participant and benefit information in accordance with this section.
(c) Additional information. The PBGC may in any case require the submission of any additional information that it needs to make the determinations that it is required to make under this part or to pay benefits pursuant to section 4061 or 4022(c) of ERISA. The plan administrator must submit any information requested under this paragraph within 30 days after receiving the PBGC's written request (or such other period as may be specified in such written request).