14 CFR Appendix D to Part 417 - Appendix D to Part 417—Flight Termination Systems, Components, Installation, and Monitoring
D417.3 Flight termination system functional requirements
(a) When a flight safety system terminates the flight of a vehicle because it has either violated a flight safety rule as defined in § 417.113 or the vehicle inadvertently separates or destructs as described in section D417.11, a flight termination system must:
(1) Render each propulsion system that has the capability of reaching a populated or other protected area, incapable of propulsion, without significant lateral or longitudinal deviation in the impact point. This includes each stage and any strap on motor or propulsion system that is part of any payload;
(2) Terminate the flight of any inadvertently or prematurely separated propulsion system capable of reaching a populated or other protected area;
(3) Destroy the pressure integrity of any solid propellant system to terminate all thrust or ensure that any residual thrust causes the propulsion system to tumble without significant lateral or longitudinal deviation in the impact point; and
(4) Disperse any liquid propellant, whether by rupturing the propellant tank or other equivalent method, and initiate burning of any toxic liquid propellant.
(b) A flight termination system must not cause any solid or liquid propellant to detonate.
(c) The flight termination of a propulsion system must not interfere with the flight termination of any other propulsion system.
