14 C.F.R. § 450.189
(b) Protection of public on the site. An operator must document a process for protecting members of the public who enter any area under the control of a launch or reentry operator, including:
(c) Countdown abort. Following a countdown abort or recycle operation, an operator must establish, maintain, and perform procedures for controlling hazards related to the vehicle and returning the vehicle, stages, or other flight hardware and site facilities to a safe condition. When a launch vehicle does not liftoff after a command to initiate flight was sent, an operator must—