SIST EN 4639-004:2009

Overview

SIST EN 4639-004:2009 is a European standard developed by CEN that defines the product specifications for female optical modules used in aerospace applications. These modules are part of a rectangular, modular, multicontact optical connector series featuring a 1.25 mm diameter ferrule and a removable alignment sleeve holder. The standard ensures compatibility, reliability, and quality of optical connectors critical for high-performance aerospace systems.

The standard specifically outlines the dimensional, mechanical, optical, and climatic characteristics required for female optical modules that fit into multipin connectors. It supports the standardization efforts of the Aerospace and Defence Industries Association of Europe (ASD-STAN) and is harmonized across multiple European countries to maintain consistency and interoperability in aerospace optical connections.

Key Topics

• Scope and Purpose
  SIST EN 4639-004:2009 targets the female optical module component within a larger family of aerospace optical connectors. It focuses on modular rectangular connectors with multicontact ferrules of 1.25 mm diameter, essential for secure and precise fiber optic interfacing.

• Module Dimensions and Interface
  Detailed dimensional requirements for the optical module are specified to ensure proper fit within rectangular connector shells. This includes:

  • Outer dimensions and keying features to prevent mismatches
  • Location and operating range of the interfacial optical seal
  • Sleeve holder screw cavity design for removable alignment sleeves

• Material and Surface Treatments
  Following aerospace-grade material standards to resist environmental conditions, mechanical stress, and temperature extremes as indicated in related standards like EN 4644-001.

• Optical, Mechanical, and Climatic Properties
  Characteristics such as tolerance to vibration, humidity, and temperature variations are aligned with EN 4639-002, guaranteeing connectors perform under strict aerospace environmental conditions.

• Marking and Identification
  Modules must carry clear marking including manufacturer identification, production date, and compliance with EN 2424 to ensure traceability and quality control throughout the aerospace supply chain.

• Designation System
  The standard defines a clear designation scheme (e.g., EN4639-004EF12A), indicating the connector type, module function, and arrangement code, facilitating easy identification and specification by manufacturers and engineers.

Applications

• Aerospace Industry
  Used primarily in aircraft and spacecraft systems to provide robust, reliable optical connections in avionics, communication, and sensor interfaces.

• Defense Equipment
  Ensures secure optical connectivity in military platforms where performance under harsh conditions like vibration and temperature extremes is mandatory.

• High-Reliability Optical Networks
  Appropriate for any application requiring modular, multicontact optical connections with guaranteed performance and interchangeability under aerospace standards.

• Fiber Optic Cable Assemblies
  Facilitates integration of removable alignment sleeves for easy maintenance and flexibility in fiber optic networks critical in aerospace environments.

Related Standards

• EN 4639-001 - Technical specifications for the overall connector series, providing basic requirements and definitions.
• EN 4639-002 - List of product standards within the aerospace optical connector family, including mechanical and climatic characteristics.
• EN 4639-005 - Removable alignment sleeve holder specifications that interface directly with the female optical module.
• EN 4644-001 - Technical specifications for rectangular electrical connectors related to mechanical and material requirements.
• EN 2424 - Aerospace product marking standard, ensuring consistent traceability and identification of components.

Keywords: EN 4639-004, aerospace optical connectors, female optical module, modular rectangular connectors, 1.25 mm ferrule, removable alignment sleeve holder, multicontact connectors, aerospace fiber optic standards, European aerospace connector standards, ASD-STAN standards