14 CFR §450.110

1. (a)Applicability. This section applies to the use of physical containment as a hazard control strategy for the flight, or phase of flight, of a launch or reentry vehicle to meet the safety criteria of § 450.101(a), (b), and (c).
2. (b)Containment. To use physical containment as a hazard control strategy, an operator must—
   1. (1)Develop the flight hazard area in accordance with § 450.133;
   2. (2)Ensure that the launch vehicle does not have sufficient energy for any hazards associated with its flight to reach outside the flight hazard area;
   3. (3)Ensure the hazard area is clear of the public and critical assets; and
   4. (4)Apply other mitigation measures necessary to ensure no public or critical asset exposure to hazards, such as control of public access or wind placards.
3. (c)Application requirements. An applicant must submit in its application the following:
   1. (1)A demonstration that the launch vehicle does not have sufficient energy for any hazards associated with its flight to reach outside the flight hazard area developed in accordance with § 450.133; and
   2. (2)A description of the methods used to ensure that flight hazard areas are cleared of the public and critical assets.