CFR›Title 46›Chapter I›Part 197 ContainsSubpart A; Appendix A; Subparts B–CCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 197—GENERAL PROVISIONS Contents A Subpart A [Reserved] Appendix A to Part 197 Appendix A to Part 197—Air No-Decompression Limits B Subpart B—Commercial Diving Operations Subject groups Equipment–Specific Diving Mode Procedures C Subpart C—Benzene Sections 197.501–197.580; Appendices A–F Authority33 U.S.C. 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703, 6101; Department of Homeland Security Delegation No. 0170.1.SourceCGD 76-009, 43 FR 53683, Nov. 16, 1978, unless otherwise noted. Previous 196 Part 196—Operations Next 199 Part 199—Lifesaving Systems for Certain Inspected Vessels