EN 14607 Part 1 of Space engineering - Mechanical specifies requirements for the discipline of thermal engineering. This document specifies the requirements for the definition, analysis, design, manufacture, verification and in-service operation of thermal control subsystems of spacecraft and other space products. This document applies to the thermal engineering activities of all spacecraft and space related products for all thermal aspects and temperature levels for space products. For this document, the complete temperature scale is divided into three ranges defined as follows: - Cryogenic temperature range, below 120 K; - Conventional temperature range, between 120 K and 420 K; - High temperature range, above 420 K. The core part of this document concerns the conventional temperature range; complementary information, requirements and definitions anf the cryogenic and high temperature range respectively are provided in annexes B and C. When viewed from the perspective of a specific project context, the requirements defined in this document should be tailored to match the genuine requirements of a particular profile and circumstances of a project.