SIST EN 2349-601:2009

Overview

SIST EN 2349-601:2009 is a European standard developed by the European Committee for Standardization (CEN) under the Aerospace series. It specifies the requirements and test procedures for determining the compass safety distance of relays and contactors used in aerospace applications. This standard ensures that the electromagnetic field generated by these electrical components does not interfere with the aircraft compass, safeguarding navigational accuracy.

The standard is intended to be used together with EN 2349-100, which covers the general requirements and testing procedures for aerospace relays and contactors. EN 2349-601 focuses specifically on evaluating how close these components can be installed to a compass without causing measurable deflection.

Key Topics

• Scope: Defines methods to test compass safety distance for aerospace relays and contactors.
• Mounting Method: Specifies the wiring and positioning of the relay or contactor near a compass for testing purposes according to EN 2349-100 guidelines.
• Test Procedure: Describes measuring compass needle deflection both when the relay/contactor coil is energized and de-energized, following ISO 7137, category 15 standards.
• Acceptance Criteria: The allowed distance is based on the point where the compass needle is deflected by 1°, adhering to ISO 7137 specifications.
• Normative References: Key standards referenced include EN 2349-100 for general relay/contactor requirements and ISO 7137 for environmental conditions and airborne equipment test procedures.

Applications

SIST EN 2349-601:2009 is critical for aerospace engineers and manufacturers designing electrical systems involving relays and contactors on aircraft. Key practical applications include:

• Design Validation: Ensuring electromagnetic interference (EMI) from relays/contactors does not compromise compass accuracy.
• Component Qualification: Testing aerospace-grade relays and contactors during development to meet strict safety and performance standards.
• Installation Guidelines: Determining minimum installation distances to avoid compass deflection, enhancing navigation system reliability.
• Regulatory Compliance: Meeting industry and regulatory requirements for airborne electrical equipment to ensure no hazardous magnetic interference occurs.

This standard supports the development of safe, reliable aerospace electrical systems by providing a consistent testing framework that minimizes risks associated with compass interference.

Related Standards

• EN 2349-100: Aerospace series - General requirements and test procedures for relays and contactors. This document complements EN 2349-601 by detailing the overall testing framework for aerospace electrical components.
• ISO 7137:1995: Aircraft - Environmental conditions and test procedures for airborne equipment. Provides standard categories for environmental and performance testing, including EMI assessments referenced by EN 2349-601.
• EUROCAE/ED-14 and RTCA/DO-160: Industry-recognized test guidelines for airborne equipment environmental conditions and test procedures, endorsed within the referenced standards framework.

By adhering to SIST EN 2349-601:2009, aerospace manufacturers and engineers can effectively ensure that their relay and contactor components maintain compass safety distances, supporting accurate navigation and operational safety across aircraft systems. This is essential in preventing interference that could lead to navigational errors or system failures, underscoring the standard’s critical role in aerospace equipment design and certification.