‘Flight termination’ systems and specially designed components therefor. Note: This control covers digital and analogue communications standards for ‘Flight termination’ systems, including encrypted operational modes. Technical Notes: 1. For the purpose of this control ‘flight termination’ can involve a controlled descent, self-destruction of the UAV or missile, or detonation of the warhead to minimise the risk of collateral damage. 2. For the purpose of this control, components include ground and on-board equipment, command exciters, encoders, amplifier controllers, command verification receivers, amplifiers, transmitters, decoders and receivers.