CFR›Title 48›Chapter 5›Part 543 ContainsSubpart 543.2CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 543—CONTRACT MODIFICATIONS Subparts 543.2 Subpart 543.2—Change Orders Section 543.205 Authority40 U.S.C. 121(c).Source64 FR 37228, July 9, 1999, unless otherwise noted. Previous 542 Part 542—Contract Administration and Audit Services Next 546 Part 546—Quality Assurance