This European Standard defines the safety programme and the safety technical requirements aiming to protect flight and ground personnel, the launch vehicle, associated payloads, ground support equipment, the general public, public and private property, the space system and associated segments and the environment from hazards associated with European space systems. This Standard is applicable to all European space projects. This standard may be tailored for the specific characteristic and constraints of a space project in conformance with ECSS-S-ST-00.