CFR›Title 48›Chapter 5›Part 517 ContainsSubparts 517.1–517.2CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 517—SPECIAL CONTRACTING METHODS Subparts 517.1 Subpart 517.1—Multi-year Contracting Section 517.109 517.2 Subpart 517.2—Options Sections 517.200–517.208 Authority40 U.S.C. 121(c).Source64 FR 37218, July 9, 1999, unless otherwise noted. Previous 516 Part 516—Types of Contracts Next 519 Part 519—Small Business Programs