Key flight-safety event limitations.
CFR · 2024-01-01 · US · Title 14
(a) A permittee must conduct any key flight-safety event so that the reusable suborbital rocket's instantaneous impact point, including its expected dispersion, is over an unpopulated or sparsely populated area. At a minimum, a key flight-safety event includes: (1) Ignition of any primary rocket engine, (2) Any staging event, or (3) Any envelope expansion. (b) A permittee must conduct each reusable suborbital rocket flight so that the reentry impact point does not loiter over a populated area.
official document · source cfr-2024 · id 14:§ 437.59