14 C.F.R. § 437.53
A permittee must protect the public from adverse effects of hazardous operations and systems in preparing a reusable suborbital vehicle for flight at a launch site in the United States and returning the reusable suborbital vehicle and any support equipment to a safe condition after flight. At a minimum, a permittee must—
[Doc. No. FAA-2006-24197, Amdt. No. 437-0, 72 FR 17019, Apr. 6, 2007, as amended by Doc. No. FAA-2023-1656, Amdt. No. 437-4, 89 FR 76727, Sept. 19, 2024]