FprEN 3475-811

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 811: Unsymmetriedämpfung

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 811 : Affaiblissement de dissymétrie

Le présent document spécifie les méthodes pour mesurer le signal d’affaiblissement de dissymétrie en mode commun converti en mode différentiel causé par les caractéristiques de symétrie des câbles de transmission. Les termes relatifs à cet affaiblissement sont définis à l’Article 3.
Il est destiné à être utilisé conjointement avec l’EN 3475 100 et l’EN 50289 1 9.

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 811. del: Neenakomerno slabljenje

General Information

• Status: Not Published
• Publication Date: 10-Jan-2027
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 2 - Cables & Stripping Tools
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 18-Jun-2026
• Completion Date: 18-Jun-2026
• Ref Project: oSIST prEN 3475-811:2023 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance attenuation

Relations

• Revises: EN 3475-811:2009 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance attenuation
• Effective Date: 28-Jan-2023

Overview

FprEN 3475-811 is a draft European Standard developed by CEN, focusing on test methods for unbalance attenuation in electrical cables used in aircraft. As part of the Aerospace series, this standard is integral for ensuring the electrical performance and reliability of cables deployed in aerospace environments. Unbalance attenuation measurement addresses the signal integrity and electromagnetic compatibility (EMC) of cables, which are vital factors in aviation safety and performance.

The standard supersedes EN 3475-811:2009, reflecting updated references and editorial improvements. It specifies methods to assess how a cable’s construction impacts the conversion of common-mode signals into differential-mode signals, which can affect communication systems and overall aircraft operation.

Key Topics

• Unbalance Attenuation: Defines the attenuation of signals due to cable symmetry, measured as longitudinal conversion loss (LCL) and longitudinal conversion transfer loss (LCTL).
• Test Methods: Details procedures for calibration, preparation of cable specimens, and setups for LCL and LCTL measurements using network analyzers and specialized baluns.
• Technical Parameters:
  • Calibration and balancing with specified insertion and return loss for baluns.
  • Properly terminated cable specimens to ensure accurate test results.
• Measurement Definitions:
  • LCL (Longitudinal Conversion Loss): Assesses signal conversion loss at the near end of the cable under common-mode excitation.
  • LCTL (Longitudinal Conversion Transfer Loss): Measures conversion loss at the far end, representing signal transmission integrity over the entire cable length.
• Compliance: Measurements must not exceed thresholds specified in product-specific standards to ensure proper cable functionality in aircraft systems.

Applications

The methods set out in FprEN 3475-811 are critical for the design, qualification, and ongoing quality assurance of aircraft electrical cables. Practical value includes:

• Aircraft Electrical Systems: Ensures cables support safe and reliable signal transmission, minimizing the risk of EMC problems that could interfere with avionics and control systems.
• Quality Assurance: Manufacturers and suppliers use these test methods during type approval and batch sampling to verify compliance with aerospace requirements.
• Cable Selection: Engineers can choose suitable cables based on standardized attenuation performance, supporting system integration and interoperability in international aviation projects.
• Regulatory Compliance: Demonstrates adherence to European aerospace industry specifications for safety-critical applications, promoting harmonization and global trade.

Related Standards

• EN 3475-100: Aerospace series – Cables, electrical, aircraft use – Test methods – Part 100: General. Provides overarching test method principles for aerospace cables.
• EN 50289-1-9: Communication cables – Specifications for test methods – Part 1-9: Electrical test methods – Unbalance attenuation. Serves as a reference for unbalance attenuation in communication cables, enhancing consistency across industries.
• ISO and IEC Terminology: For consistent definitions and technical language, consult ISO Online Browsing Platform and IEC Electropedia.

By standardizing unbalance attenuation testing, FprEN 3475-811 supports the development of robust, efficient, and safe electrical systems within the aerospace sector, ensuring cables meet stringent international performance expectations.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2023
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode -
811. del: Neenakomerno slabljenje
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance
attenuation
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren -
Teil 811: Unsymmetriedämpfung
Série aérospatiale - Câbles électriques à usage aéronautique - Méthode d'essai - Partie
811: Affaiblissement de dissymétrie
Ta slovenski standard je istoveten z: prEN 3475-811
ICS:
29.060.20 Kabli Cables
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 3475-811
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2023
ICS 49.060 Will supersede EN 3475-811:2009
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 811: Unbalance attenuation
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthode d'essai - Partie 811: Luftfahrtverwendung - Prüfverfahren - Teil 811:
Affaiblissement de dissymétrie Unsymmetriedämpfung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3475-811:2023 E
worldwide for CEN national Members.

prEN 3475-811:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Preparation of specimens . 5
5 Apparatus . 5
6 Methods . 6
6.1 Calibration . 6
6.2 LCL measurement . 7
6.3 LCTL measurement . 7
7 Requirements . 8
Bibliography . 9

prEN 3475-811:2023 (E)
European foreword
This document (prEN 3475-811:2023) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3475-811:2009.
The main changes compared to the previous edition are as follows:
— addition of reference to EN 50289-1-9 to the scope;
— editorial revision of the document.
Any feedback and questions on this document should be directed to the users’ national s
...