ISO 25119-4:2018

Overview

ISO 25119-4:2018 - Tractors and machinery for agriculture and forestry - Safety-related parts of control systems - Part 4: Production, operation, modification and supporting processes provides principles and process requirements for the lifecycle activities that support safety-related parts of control systems (SRP/CS) on tractors, self‑propelled ride‑on machines and mounted/semi‑mounted/trailed agricultural and forestry machines. The standard applies to electrical/electronic/programmable electronic systems (E/E/PES) as they relate to mechatronic safety functions, and focuses on hazards caused by malfunctioning behavior and system interactions. It does not itself set application performance levels (AgPL) - those are set by machine‑specific type‑C standards or the manufacturer.

Key Topics and Requirements

The document structures lifecycle controls and technical requirements for SRP/CS production and maintenance, including:

• Quality management system: requirements for processes that ensure consistent safety outputs.
• Safety validation and verification: planning, prerequisites, activities and work products for demonstrating SRP/CS meet safety requirements.
• Configuration management: version control, traceability and change tracking for SRP/CS.
• Product release: conditions, documentation and records required before deployment.
• Production planning and testing: production plans, test plans, personnel competence, process capability, storage and transport controls.
• Operation planning and maintenance: servicing schedules, repair and technician instructions, user information, field observation and decommissioning guidance.
• Modification/change management: procedures for modification requests, impact assessment, authorization and documentation.
• Supplier procedures: requirements for SRP/CS suppliers, partner confirmation measures and system validation.
• Technical documentation: retention, structure and minimum content for records useful for safety audits and compliance.

Note: The standard covers E/E/PES malfunction‑related hazards (e.g., EMI with SRP/CS, SRP/CS mitigating hybrid current flow). It excludes non‑E/E/PES systems (hydraulic, mechanical, pneumatic) and hazards not caused by E/E/PES malfunctions.

Practical Applications

ISO 25119-4:2018 is used to establish robust production and support processes that maintain SRP/CS safety across the product lifecycle. Typical applications include:

• Developing production test plans and release criteria for agricultural tractors and machines.
• Establishing maintenance, repair and decommissioning procedures for SRP/CS.
• Managing design changes and supplier activities to preserve functional safety.
• Preparing technical documentation and evidence for compliance, audits and certification.

Who Uses This Standard

• OEMs and manufacturers of tractors and agricultural/forestry machinery
• Safety and systems engineers responsible for SRP/CS and E/E/PES
• Component and subsystem suppliers of control systems
• Quality, production and maintenance managers
• Certification bodies and conformity assessment teams

Related Standards

• ISO 25119 series (other parts covering principles, design and validation)
• ISO 12100 (general machine safety and design principles)

Keywords: ISO 25119-4:2018, SRP/CS, tractors and machinery for agriculture and forestry, safety-related parts of control systems, E/E/PES, production testing, configuration management, functional safety.