SIST EN 2591-424:2004

Overview

SIST EN 2591-424:2004 is a European aerospace standard developed by CEN and the European Association of Aerospace Manufacturers (AECMA). It defines a precise method to determine the stripping force of solderless wrapped connections used in electrical and optical connection elements within aerospace applications. This standard ensures reliable and consistent testing methods to verify the mechanical integrity and quality of wrapped connections without soldering. SIST EN 2591-424:2004 is intended to be used in conjunction with EN 2591-100, which covers general test methods for aerospace electrical and optical connection elements.

Key Topics

• Stripping Force Measurement
  The standard specifies the procedure for measuring the force required to strip wrapped (solderless) connections from conductors or cables. This force is tested along the axis of the connection using a controlled stripping tool.

• Test Setup and Apparatus
  The described apparatus includes a holding device for the specimen, a forked hook to apply the stripping force, and a stripping tool with precise clearance relative to the wrapped connector diameter (not exceeding 50%). The force is applied steadily at a speed between 25 mm/min and 50 mm/min.

• Specimen Preparation
  Specimens must be prepared and examined according to related standards EN 2591-101 (Visual examination) and EN 2591-102 (Dimension and mass examination). Specifications must include details such as conductor or cable type, contact type, wrapping technique (single or double), wrapping tools, and stripping tools.

• Testing Requirements
  The measured stripping force must meet or exceed a specified minimum value to ensure secure mechanical connection. The test progresses until the wrapped turns move along the specimen axis by a distance equal to the cable or conductor diameter.

Applications

SIST EN 2591-424:2004 is essential for aerospace manufacturers, quality assurance labs, and aerospace component suppliers who design, produce, or test solderless wrapped electrical and optical connections. Key application areas include:

• Aerospace Electrical Systems
  Verifying the mechanical reliability and durability of solderless wrapped electrical connections within avionics, control systems, and aircraft wiring harnesses.

• Optical Connection Elements
  Ensuring robust mechanical retention of optical fiber connections that use solderless wrapping methods, crucial for high-performance aerospace communication systems.

• Quality Control and Certification
  Providing a standardized testing protocol to validate component compliance during production or routine maintenance, facilitating adherence to aerospace industry quality regulations.

• Component Development and R&D
  Assisting engineers in assessing new materials, wrapping tools, and connection designs under controlled test conditions to optimize reliability.

Related Standards

• EN 2591-100 – General Test Methods for Aerospace Electrical and Optical Connection Elements
  Provides the foundational procedures and guidelines applicable to test methods including the stripping force test.

• EN 2591-101 – Visual Examination of Aerospace Electrical and Optical Connection Elements
  Defines requirements for visual inspection to identify defects before mechanical testing.

• EN 2591-102 – Examination of Dimensions and Mass of Aerospace Connection Elements
  Specifies measurement methods critical for specimen preparation prior to stripping force testing.

• Additional Aerospace Connection Standards
  Other parts of the EN 2591 series cover various electrical and optical connection test methods ensuring holistic quality assurance across aerospace component testing.

Keywords: SIST EN 2591-424:2004, aerospace standard, stripping force, solderless wrapped connections, electrical connection test method, optical connection, aerospace wiring, mechanical force test, aerospace quality assurance, CEN standard, AECMA standard.