29 CFR §4233.13

1. (a)Interagency coordination. For a plan sponsor that has requested a conditional approval of a partition pursuant to § 4233.12(c), PBGC may render either a conditional approval or a final denial of the application on an expedited basis, provided that the plan sponsor has submitted a completed application to PBGC as prescribed by § 4233.10. PBGC will consult with Treasury and the Department of Labor in the course of reviewing an application for partition.
   1. (1)If PBGC denies the application for partition, it will notify the plan sponsor in writing of PBGC's decision in accordance with § 4233.12(b), and will notify Treasury to allow it to take appropriate action on the benefit suspension application.
   2. (2)If PBGC grants a conditional approval of partition, it will notify the plan sponsor in writing of PBGC's decision in accordance with § 4233.12(c), and will provide Treasury with a copy of PBGC's decision along with PBGC's record of the decision.
   3. (3)If Treasury does not issue the final authorization to suspend, PBGC's conditional approval under § 4233.12(c) will be null and void.
   4. (4)If Treasury issues a final authorization to suspend, PBGC will issue a final partition order under § 4233.14 and section 4233(c) of ERISA. The effective date of a final partition order must satisfy the requirements of section 305(e)(9)(D)(v) of ERISA.
2. (b)Combined notice. A plan sponsor submitting an application for benefit suspensions under section 305(e)(9) of ERISA with Treasury, and a partition under section 4233 of ERISA with PBGC, may combine the PBGC model notice for coordinated applications provided at Appendix A with the Treasury model notice in Appendix A of Rev. Proc. 2015-34 in satisfaction of the notice requirement of this part.