Home › CFR › Title 29 › Part 420329 CFR Part 4203 — Extension of Special Withdrawal Liability Rules§ 4203.1— Purpose and scope.§ 4203.2— Definitions.§ 4203.3— Plan adoption of special withdrawal rules.§ 4203.4— Requests for PBGC approval of plan amendments.§ 4203.5— PBGC action on requests.