RAMSkrav

RAMSkrav refers to the set of requirements that govern a system’s RAMS—reliability, availability, maintainability, and safety—throughout its life cycle. The concept is commonly used in Swedish-language engineering contexts and in sectors where RAMS considerations are mandated by regulation, such as rail transport, aviation, and industrial automation. RAMSkrav are typically documented as part of the system requirements specification and are traced through design, verification, and validation activities.

Typical RAMSkrav cover four areas. Reliability targets specify acceptable failure rates and metrics such as mean time between failures. Availability targets define the expected operational uptime and downtime allowances. Maintainability targets address how quickly and easily the system can be repaired, including metrics like mean time to repair and the availability of diagnostics. Safety requirements address hazards, safety integrity levels, and compliance with relevant safety standards. RAMSkrav also encompass related processes such as diagnostics, preventive maintenance strategies, spare parts provisioning, and configuration management. RAMS data are supported by analyses and techniques such as FMEA, FTA, reliability growth, and hazard analyses, and are often documented in a safety case or RAMS report.

In practice, RAMSkrav are developed through early risk assessment and stakeholder input and require traceability from high-level objectives to lower-level component requirements. They are revisited during design changes, system integration, testing, operation, and decommissioning. Standards commonly referenced include EN 50126 and other RAMS-oriented frameworks (IEC 61508, ISO 26262) depending on the domain. See also RAMS, reliability engineering, safety case, EN 50126.