CFR›Title 40›Chapter I›Part 51›Subpart R ContainsSection 51.341CorpusDaily eCFRDisplayed edition2026-10-22Last updated2026-10-22 Subpart R—Extensions Sections 51.341 § 51.341 Request for 18-month extension. Previous Q Subpart Q—Reports Next S Subpart S—Inspection/Maintenance Program Requirements