SIST EN 4604-009:2026

Aerospace series - Cable, electrical, for signal transmission - Part 009 : Cable, coaxial, light weight, 50 ohms, 180 °C, type KW (light WN) - Product standard

This document specifies the required characteristics of a light weight coaxial cable, 50 Ω, type KW for use in aircraft electrical systems at operating temperature between −55 °C and 180 °C and specially for high frequency up to 6 GHz. Nevertheless, if needed, −65 °C is also acceptable as shown by rapid change of temperature test.

Luft- und Raumfahrt - Elektrische Leitungen für Signalübertragungen - Teil 009: Koaxialkabel, Leichtbauweise, 50 Ohm, 180 °C, Typ KW (WN Leichtbauweise) - Produktnorm

Série aérospatiale - Câbles électriques pour transmission de signaux - Partie 009 : Câble, coaxial, allégé 50 ohms, 180 °C, type KW (WN allégé) - Norme de produit

Le présent document spécifie les caractéristiques requises d’un câble coaxial semi-rigide allégé, 50 , de type KW, pour utilisation dans les systèmes électriques d’aéronefs à des températures de fonctionnement comprises entre 55 °C et 180 °C, et notamment à haute fréquence jusqu’à 6 GHz. Néanmoins, si nécessaire, 65 °C est également acceptable comme indiqué par l’essai de variation rapide de température.

Aeronavtika - Kabli, električni, za prenos signala - 009. del: Kabli, koaksialni, lahki, 50 ohmov, 180 °C, tip KW (lahki WN) - Standard za proizvod

Ta dokument določa zahtevane lastnosti lahkega koaksialnega kabla, 50 Ω, tipa KW, za uporabo v električnih sistemih letal pri obratovalnih temperaturah med −55 °C in 180 °C, posebej za visoke frekvence do 6 GHz. Kljub temu je, če je potrebno, sprejemljiva tudi temperatura −65 °C, kar je dokazano s preskusom hitre spremembe temperature.

General Information

• Status: Published
• Public Enquiry End Date: 21-May-2024
• Publication Date: 07-May-2026
• ICS: 33.120.10 - Coaxial cables. Waveguides
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-May-2026
• Due Date: 09-Jul-2026
• Completion Date: 08-May-2026
• Ref Project: EN 4604-009:2026 - Aerospace series - Cable, electrical, for signal transmission - Part 009: Cable, coaxial, light weight, 50 ohms, 180 °C, type KW (light WN) - Product standard

Relations

• Referred By: SIST EN 4604-002:2010 - Aerospace series - Cable, electrical, for signal transmission - Part 002 : General
• Effective Date: 22-Apr-2026
• Referred By: SIST EN 4604-001:2019 - Aerospace series - Cable, electrical, for signal transmission - Part 001: Technical specification
• Effective Date: 22-Apr-2026
• Revises: SIST EN 4604-009:2017 - Aerospace series - Cable, electrical, for signal transmission - Part 009: Cable, coaxial, light weight, 50 ohms, 180 °C, type KW (light WN) - Product standard
• Effective Date: 05-Apr-2023

Overview

SIST EN 4604-009:2026 is a European standard specifying the product requirements for lightweight coaxial cables, type KW (light WN), with a characteristic impedance of 50 ohms for use in aircraft electrical and signal transmission systems. Designed to operate between −55 °C and 180 °C, these cables are suitable for high-frequency applications up to 6 GHz. The standard focuses on providing key characteristics, performance, and quality assurance needed for reliable signal transmission in aerospace environments, supporting safety and efficiency in modern aircraft systems.

Key Topics

• Cable Type and Structure:

  • Lightweight, coaxial construction for reduced mass
  • 50-ohm characteristic impedance for standard aerospace applications
  • Designed with materials such as silver-plated copper-clad aluminum conductor and fluorocarbon dielectric

• Temperature and Frequency Performance:

  • Continuous operation from −55 °C to 180 °C
  • Capable of withstanding rapid temperature changes down to −65 °C
  • Frequency performance guaranteed up to 6 GHz

• Physical and Electrical Properties:

  • Low attenuation and high power handling requirements
  • Minimum bend radii for static (80 mm) and dynamic (120 mm) installations
  • High voltage operation (up to 1,000 V RMS max)

• Qualification and Testing:

  • Comprehensive testing for resistance, insulation, attenuation, flexibility, flammability, and environmental durability
  • Compliance with numerous referenced test methods (EN 3475 series)

• Quality Assurance:

  • Conformance with general requirements from EN 4604-001 for aerospace electrical interconnectivity
  • Identification, marking, packaging, and delivery aligned with established aerospace standards

Applications

SIST EN 4604-009:2026 is essential for designers, manufacturers, and operators involved in:

• Aircraft Signal Transmission:
  Ensures reliable, lightweight, and high-performance transmission of electronic signals in civil and military aircraft.

• Aerospace Electrical Systems:
  Used in avionics, navigation, communication, and sensor systems where high frequency and thermal stability are critical.

• High-Density and Weight-Sensitive Installations:
  The lightweight design supports modern aircraft trends toward increased efficiency and reduced overall mass.

• Harsh Environments:
  Suitable for applications requiring resistance to rapid temperature swings, vibrations, and exposure to fluids.

By adhering to this standard, organizations can meet regulatory and safety requirements while optimizing the performance and efficiency of aerospace electrical networks.

Related Standards

For holistic compliance and best practices in aircraft electrical and signal transmission cabling, reference these related standards:

• EN 3197: Design and installation of aircraft electrical and optical interconnection systems
• EN 3475 series: Comprehensive test methods for aerospace electrical cables, including visual examination, mass, dimensions, resistance, flexibility, thermal and environmental tests
• EN 4434: Lightweight conductors for aerospace electrical cables
• EN 4604-001: Technical specification for cable design
• EN 4604-002: General requirements for cable identification and marking
• IEC 60096-0-1: Guide to the design of coaxial cables for radio frequency applications
• ASTM B566: Copper-clad aluminum wire specification

Adoption of SIST EN 4604-009:2026 and its referenced standards ensures safety, interoperability, and high performance in aerospace cable installations, supporting both regulatory compliance and technological advancement in aerospace engineering.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2026
Aeronavtika - Kabli, električni, za prenos signala - 009. del: Kabli, koaksialni, lahki,
50 ohmov, 180 °C, tip KW (lahki WN) - Standard za proizvod
Aerospace series - Cable, electrical, for signal transmission - Part 009 : Cable, coaxial,
light weight, 50 ohms, 180 °C, type KW (light WN) - Product standard
Luft- und Raumfahrt - Elektrische Leitungen für Signalübertragungen - Teil 009:
Koaxialkabel, Leichtbauweise, 50 Ohm, 180 °C, Typ KW (WN Leichtbauweise) -
Produktnorm
Série aérospatiale - Câbles électriques pour transmission de signaux - Partie 009 :
Câble, coaxial, allégé 50 ohms, 180 °C, type KW (WN allégé) - Norme de produit
Ta slovenski standard je istoveten z: EN 4604-009:2026
ICS:
33.120.10 Koaksialni kabli. Valovodi Coaxial cables. Waveguides
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.

EN 4604-009
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2026
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 4604-009:2017
English Version
Aerospace series - Cable, electrical, for signal transmission
- Part 009: Cable, coaxial, light weight, 50 ohms, 180 °C,
type KW (light WN) - Product standard
Série aérospatiale - Câbles électriques pour Luft- und Raumfahrt - Elektrische Leitungen für
transmission de signaux - Partie 009 : Câble, coaxial, Signalübertragungen - Teil 009: Koaxialkabel,
allégé 50 ohms, 180 °C, type KW (WN allégé) - Norme Leichtbauweise, 50 Ohm, 180 °C, Typ KW (WN
de produit Leichtbauweise) - Produktnorm
This European Standard was approved by CEN on 24 November 2025.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4604-009:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 6
4 Required characteristics . 6
4.1 Material, construction, dimensions and mass . 6
4.1.1 Material . 6
4.1.2 Construction, dimensions and mass . 7
4.2 General characteristics . 7
4.3 Electrical characteristics . 7
4.4 Tests . 10
5 Quality assurance . 15
6 Designation . 16
7 Identification and marking . 16
8 Colours of components and jacket . 16
9 Packaging, labelling and delivery lengths . 16
9.1 Packaging and labelling . 16
9.2 Delivery lengths. 16
10 Technical specification . 16
Bibliography . 17

European foreword
This document (EN 4604-009:2026) has been prepared by 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 shall be given the status of a national standard, either by publication of an identical text
or by endorsement, at the latest by October 2026, and conflicting national standards shall be withdrawn
at the latest by October 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 4604-009:2017.
EN 4604-009:2017:
— editorial improvements and update of 4.3 to modify Table 3 and add Figure 2.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this document: 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 the
United Kingdom.
1 Scope
This document specifies the required characteristics of a light weight coaxial cable, 50 Ω, type KW for use
in aircraft electrical systems at operating temperature between −55 °C and 180 °C and specially for high
frequency up to 6 GHz. Nevertheless, if needed, −65 °C is also acceptable as shown by rapid change of
temperature test.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 3197, Aerospace series — Design and installation of aircraft electrical and optical interconnection
systems
EN 3475-201, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 201: Visual
examination
EN 3475-202, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 202: Mass
EN 3475-203, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 203: Dimensions
EN 3475-301, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 301: Ohmic
resistance per unit length
EN 3475-302, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 302: Voltage proof
test
EN 3475-303, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 303: Insulation
resistance
EN 3475-306, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 306: Continuity of
conductors
EN 3475-407, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 407: Flammability
EN 3475-411, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 411: Resistance to
fluids
EN 3475-415, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 415: Rapid change
of temperature
EN 3475-416, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 416: Thermal
stability
EN 3475-418, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 418: Thermal
endurance for conductors
EN 3475-502, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 502: Notch
propagation
EN 3475-503, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 503: Scrape
abrasion
EN 3475-505, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 505: Tensile test
on conductors and strands
EN 3475-506, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 506: Plating
continuity
EN 3475-507, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 507: Adherence of
plating
EN 3475-508, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 508: Plating
thickness
EN 3475-512, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 512: Flexure
endurance
EN 3475-513, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 513: Deformation
resistance (installation with plastic cable ties)
EN 3475-514, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 514: Porosity of
copper cladding on aluminium strands
EN 3475-515, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 515: Crush
resistance
EN 3475-601, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 601: Smoke
density
EN 3475-602, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 602: Toxicity
EN 3475-701, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 701: Strippability
and adherence of insulation to the conductor
EN 3475-702, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 702: Screen
pushback capability
EN 3475-703, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 703: Permanence
of manufacturer’s marking
EN 3475-704, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 704: Flexibility
EN 3475-804, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 804: Velocity of
propagation
EN 3475-805, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 805:
Characteristic impedance
EN 3475-806, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 806: Attenuation
EN 3475-807, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 807: Transfer
impedance
EN 3475-812, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 812: Return loss
(VSWR)
EN 4434, Aerospace series — Copper or copper alloy lightweight conductors for electrical cables — Product
standard (Normal and tight tolerances)
EN 4604-001, Aerospace series — Cable, electrical, for signal transmission — Part 001: Technical
specification
EN 4604-002, Aerospace series — Cable, electrical, for signal transmission — Part 002: General
ASTM B566, Standard Specification for Copper-Clad Aluminium Wire
IEC 60096-0-1, Radio frequency cables — Part 0-1: Guide to the design of detail specifications — Coaxial
cables
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 3475-100 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Required characteristics
4.1 Material, construction, dimensions and mass
4.1.1 Material
Material shall be as described in Table 1.
Table 1 — Material
Material Finish Colour
Single-strand (copper clad aluminium
Conductor 1 µm silver plated —
according to ASTM B566 class 15 A)
Dielectric Fluorocarbon dielectric with low epsilon — —
Screen (foil) Foil, silver plated copper or silver alloy — —
Reinforced braid made of a mix of strands in:
— copper or copper alloy according to
EN 4434;
Shiel
...