prEN 3197

Aerospace series - Design and installation of aircraft electrical and optical interconnection systems

This document provides instructions on the methods to be used when designing, selecting, manufacturing, installing, repairing or modifying the aircraft electrical and optical interconnection networks, also called Electrical Wiring Interconnection System (EWIS), and Optical fibre Interconnection Systems (OFIS), subject to the following limitations:
-   It is recognized that the installation practices contained in this document do not necessarily represent the full requirements for a safe and satisfactory electrical and fibre optic interconnection system.
-   In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. However, nothing written in this document overrides the specific requirements of a Design Authority, the Airworthiness Requirements, applicable laws or any regulation from the regulatory authorities, unless a specific exemption has been obtained.
This document lists the main relevant European Standards related to EWIS and OFIS in Annex A.

Luft- und Raumfahrt - Konstruktion und Installation elektrischer und optischer Verkabelung in Luftfahrzeugen

Série Aérospatiale - Conception et installation des organes de raccordements électriques et à fibres optiques sur avions

Aeronavtika - Načrtovanje in vgradnja letalskih električnih in optičnih sistemov za medsebojno povezovanje

General Information

• Status: Not Published
• Publication Date: 21-Mar-2027
• ICS: 49.060 - Aerospace electric equipment and systems
• ICS: 49.090 - On-board equipment and instruments
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 8 - Installation Technologies
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 25-Sep-2025
• Completion Date: 25-Sep-2025
• Ref Project: oSIST prEN 3197:2025 - Aerospace series - Design and installation of aircraft electrical and optical interconnection systems

Relations

• Revises: EN 3197:2010 - Aerospace series - Design and installation of aircraft electrical and optical interconnection systems
• Effective Date: 26-Feb-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2025
Aeronavtika - Načrtovanje in vgradnja letalskih električnih in optičnih sistemov za
medsebojno povezovanje
Aerospace series - Design and installation of aircraft electrical and optical
interconnection systems
Luft- und Raumfahrt - Konstruktion und Installation elektrischer und optischer
Verkabelung in Luftfahrzeugen
Série Aérospatiale - Conception et installation des organes de raccordements
électriques et à fibres optiques sur avions
Ta slovenski standard je istoveten z: prEN 3197
ICS:
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
49.090 Oprema in instrumenti v On-board equipment and
zračnih in vesoljskih plovilih instruments
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2025
ICS 49.060; 49.090 Will supersede EN 3197:2010
English Version
Aerospace series - Design and installation of aircraft
electrical and optical interconnection systems
Série Aérospatiale - Conception et installation des Luft- und Raumfahrt - Konstruktion und Installation
organes de raccordements électriques et à fibres elektrischer und optischer Verkabelung in
optiques sur avions Luftfahrzeugen
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3197:2025 E
worldwide for CEN national Members.

Contents          Page
European foreword . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 EWIS and OFIS Architecture Requirements . 16
4.1 Applicable regulation . 16
4.1.1 General . 16
4.1.2 Large aeroplanes . 16
4.1.3 Small and medium aeroplanes including unmanned air vehicles. 17
4.1.4 Small rotorcraft . 17
4.1.5 Large rotorcraft . 17
4.1.6 Aircraft engines . 17
4.2 Main design rules . 17
4.2.1 Design priority . 17
4.2.2 Service life . 18
4.2.3 Maintenance considerations . 18
4.2.4 Composite structure . 18
4.3 Parts, materials and processes . 19
4.3.1 Selection considerations . 19
4.3.2 Components qualification . 19
4.3.3 Processes qualification . 20
4.3.4 Test methods . 20
4.3.5 Environmental directives . 20
4.4 Main hazards . 20
4.4.1 Security for personnel — Human protection . 20
4.4.2 Smoke and fire hazards. 21
4.4.3 Arcing event types . 21
4.4.4 Corona effect . 28
4.4.5 Clearance and creepage . 29
4.5 Fretting corrosion . 29
4.5.1 Phenomenon description . 29
4.5.2 Fretting corrosion mitigation . 30
4.6 Failure Mode Effect and Analysis (FMEA). 30
4.6.1 Context . 30
4.6.2 Mitigation means . 31
4.6.3 EWIS component failure modes . 31
4.7 Systems architecture requirements toward EWIS and OFIS architecture . 32
4.7.1 System Architectural pattern. 32
4.7.2 Safety Requirements . 33
4.7.3 Aircraft Operational Reliability Aspects . 33
4.7.4 Aircraft or system specific requirements . 34
4.7.5 Elementary functions . 34
4.7.6 Failure conditions of functions . 35
4.7.7 Specific EWIS and OFIS requirements . 36
4.8 Grounding, bonding and shielding . 37
4.8.1 Grounding/Electrical current return . 37
4.8.2 Bonding . 38
4.8.3 Shielding/Shield bonding . 40
5 EWIS and OFIS architecture segregation . 40
5.1 Purpose . 40
5.2 Route categories . 41
5.3 Electrical generation . 42
5.4 Earthing Networks/Grounding strategy (IT/TN network) . 42
5.5 Electrical distribution and communication . 43
5.5.1 Purpose . 43
5.5.2 Power supplies and data . 43
5.5.3 Essential routes . 44
5.5.4 Cabin related harnesses . 44
5.5.5 Electrical Flight Control System (EFCS) . 44
5.5.6 Fuel tank wiring . 45
5.5.7 Signal and other low power sensitive circuit . 45
5.5.8 Electro-explosive subsystems . 45
5.6 Grounding, bonding and shielding . 45
5.6.1 Grounding/Electrical current return . 45
5.6.2 Bonding . 46
5.6.3 Shielding . 46
5.7 Specific Hazard — Particular risk architectural constraint . 46
6 Components selection . 47
6.1 Applicable regulation . 47
6.2 General requirements . 47
6.2.1 Commonality . 47
6.2.2 Environment . 47
6.2.3 Maintenance, repair or modification.
...