SIST EN 3745-201:2004

Overview

SIST EN 3745-201:2004 is a European standard developed by the European Committee for Standardization (CEN) that specifies the visual examination methods for optical fibres and optical cables intended for aircraft use. This standard is part of the aerospace series focusing on fibres and cables for aeronautical applications, ensuring that optical components meet stringent quality and safety requirements. It is designed to be used in conjunction with EN 3745-100, which covers general test methods for these fibres and cables.

The standard provides a consistent method for inspecting optical fibres and cables visually to detect defects that could compromise performance or reliability during aircraft operation. By following this standard, manufacturers, quality engineers, and inspectors can ensure aerospace optical cables maintain the highest standards required in aviation environments.

Key Topics

• Scope and Application
  SIST EN 3745-201:2004 targets optical fibres and cables specifically for aerospace use, emphasizing their critical role in aircraft electrical and communication systems.

• Visual Inspection Criteria
  The standard outlines detailed criteria for inspecting both optical fibres and cables, including:

  • Correct identification through color coatings
  • Absence of visible defects such as lumps, abrasions, cracks, splits, or blisters on fibre coatings
  • Proper marking and labeling of cables per product specifications
  • Cable jackets free from discoloration, scorching, delaminations, voids, and deformities
  • No metallic or gritty particles embedded in protective coatings
  • No cracking or crazing on cable surfaces

• Inspection Equipment and Conditions

  • Use of a lamp providing illumination between 500 to 700 lux on the inspection surface
  • Use of a 10x magnifying lens or microscope for fibre inspection
  • Visual inspection of cables with naked eye at a maximum distance of 0.3 meters under proper lighting conditions
  • Specimens laid flat on a workbench for optimal examination

• Compliance Requirements
  The document emphasizes that the visual examination method must be utilized in combination with the provisions outlined in EN 3745-100 to ensure a harmonized testing approach.

Applications

• Aerospace Manufacturing
  Ensures that optical fibres and cables used in the manufacture of aircraft systems meet rigorous quality standards before assembly.

• Quality Control and Assurance
  Provides aerospace industry inspectors with standardized procedures to verify the integrity and quality of optical cable assemblies during production and pre-installation phases.

• Maintenance and Inspection of Aircraft Systems
  Supports maintenance professionals in visually assessing optical cables as part of routine inspections or fault detection to prevent failures in critical communication or control systems.

• Research and Development
  Facilitates R&D engineers in evaluating prototypes or new designs of aerospace optical fibres and cables by providing clear visual evaluation criteria.

Related Standards

• EN 3745-100 – Aerospace series fibers and cables, optical, aircraft use – Test methods – Part 100: General requirements
  This standard complements EN 3745-201 by providing foundational test methods applicable to all optical fibres and cables within aerospace applications.

• Other aerospace electrical and optical standards governed by the European Association of Aerospace Manufacturers (AECMA), ensuring comprehensive testing frameworks for various aircraft components.

By adhering to SIST EN 3745-201:2004, the aerospace industry benefits from consistent quality control of optical fibres and cables, enhancing safety, reliability, and performance of critical aircraft communication systems. This standard is an essential reference for manufacturers, inspectors, and engineers working within the highly demanding field of aerospace electrical equipment and systems.