TS EN 61025

TS EN 61025 is the standard that defines fault tree analysis (FTA) and explains how the method is used in reliability and risk-oriented engineering work. FTA is a top-down analytical technique that examines how a specified top event can arise from combinations of basic events, component failures, and logical relationships within a system.

Technical purpose and core logic of FTA

From a general engineering perspective, FTA uses logic gates, events, and failure pathways to map causes in a structured way. This makes it easier to trace a visible system failure back to its possible contributors, which is valuable in design review, maintenance planning, safety analysis, and reliability assessment. The standard explains the basic principles of the method, the associated mathematical modelling, and how FTA relates to other reliability modelling techniques.

What the standard covers

• Definition of the basic principles of FTA
• Explanation of the associated mathematical modelling
• Explanation of the relationship between FTA and other reliability modelling techniques
• Description of the steps involved in performing an FTA
• Identification of appropriate assumptions, events, and failure modes
• Identification and description of commonly used symbols

This standard provides a shared framework for engineers, reliability specialists, and quality professionals who use fault tree methods. It is especially relevant where complex technical systems must be analysed in a disciplined way to understand how failures develop and how critical contributors can be identified.