29 C.F.R. § 4041A.21
General rule.
eCFR amendment effective 2019-05-02 · in effect May 2, 2019 to Jul 1, 2019
Link to an amendment published at 84 FR 18722, May 2, 2019.
The plan sponsor of a multiemployer plan that terminates by mass withdrawal shall continue to administer the plan in accordance with applicable statutory provisions, regulations, and plan provisions until a trustee is appointed under section 4042 of ERISA or until plan assets are distributed in accordance with subpart D of this part. In addition, the plan sponsor shall be responsible for the specific duties described in this subpart.