SIST EN 3745-516:2017

Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 516: Severe cable bend test

This European Standard specifies a method of checking the break resistance and attenuation variation recovery of an optical cable subjected to severe bending under load.

Luft- und Raumfahrt - Faseroptische Leitungen für Luftfahrzeuge - Prüfverfahren - Teil 516: Schwere Kabelbiegeprüfung

Série aérospatiale - Fibres et câbles optiques à usage aéronautique - Méthodes d'essais - Partie 516: Essai de courbure sévère

Aeronavtika - Optična vlakna in kabli za uporabo v zračnih plovilih - Preskusne metode - 516. del: Upogibni preskus kabla

Ta evropski standard določa metodo za preverjanje odpornosti na prelom in obnovitev sprememb v slabljenju optičnega kabla, ki je bil izpostavljen upogibanju pod obremenitvijo.

General Information

• Status: Published
• Publication Date: 12-Apr-2017
• ICS: 33.180.10 - Fibres and cables
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 31-Mar-2017
• Due Date: 05-Jun-2017
• Completion Date: 13-Apr-2017
• Ref Project: EN 3745-516:2017 - Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 516: Severe cable bend test

Relations

• Replaces: SIST EN 3745-516:2012 - Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 516: Severe cable bend test
• Effective Date: 29-Mar-2017
• Revised: oSIST prEN 3745-100:2025 - Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 100: General
• Effective Date: 15-Oct-2025
• Revised: SIST EN 3745-516:2012 - Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 516: Severe cable bend test
• Effective Date: 12-Mar-2014

Overview

EN 3745-516:2017 - Aerospace series, Part 516: Severe cable bend test is a CEN/ASD‑STAN European Standard that specifies a laboratory method for checking break resistance and attenuation variation recovery of optical fibres and cables for aircraft when subjected to severe bending under load. The procedure is intended to verify that an optical cable maintains optical performance (no fibre breaks and acceptable attenuation recovery) after repeated, loaded bends representative of extreme service or handling conditions.

Key topics and technical requirements

• Scope: Verifies break resistance and recovery of attenuation for aircraft optical cables under severe bending.
• Specimen preparation: Stabilize specimens at standard test conditions for 24 h (per EN 2591-100). Test parameters (fibre/cable type and length, load mass M, bend radius R, number of rotations N) are defined by the applicable product standard.
• Apparatus:
  • Light Launch System (LLS) and Light Detection System (LDS) as defined in EN 2591-100.
  • Flat metal bend fixture with a rounded edge; a typical edge radius R = (0,25 ± 0,01) mm is indicated or use the radius specified in the product standard.
  • Clamps and specified load masses to ensure contact with the bending edge.
• Test method (summary):
  • Connect specimen to LLS and LDS; attach load M.
  • Zero LDS, mount on bend fixture and apply load.
  • After 1 minute measure attenuation variation (EN 3745-301, method C) to detect breaks.
  • Remove load, rotate cable 180° and slide ~30 cm to change bend location; repeat for N rotations.
  • After completion, straighten specimen, measure attenuation after 1 minute, then measure residual attenuation after removal and perform visual inspection (EN 3745-201).
• Acceptance criteria: Ensure no fibre breakage and that residual attenuation variation meets product-standard requirements.

Applications and users

This test standard is used to:

• Qualify optical fibres and cables for aircraft electrical/optical systems where extreme bending might occur (e.g., tight routing, harness flexing).
• Support material and cable selection, supplier qualification, production quality control and design verification. Primary users:
• Aerospace OEMs and Tier‑1 suppliers
• Cable designers and manufacturers
• Independent test laboratories and certification bodies
• Quality assurance, procurement and engineering teams working on avionic harnesses

Related standards

Normative references incorporated into EN 3745-516:2017 include:

• EN 2591-100 (LLS/LDS and general test conditions)
• EN 3745-100 (general test methods for aerospace optical cables)
• EN 3745-201 (visual examination)
• EN 3745-301 (attenuation measurement methods)

Keywords: EN 3745-516:2017, severe cable bend test, aerospace optical cable testing, attenuation recovery, break resistance, Light Launch System, Light Detection System, aircraft optical fibres, CEN, ASD-STAN.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Faseroptische Leitungen für Luftfahrzeuge - Prüfverfahren - Teil 516: Schwere KabelbiegeprüfungSérie aérospatiale - Fibres et câbles optiques à usage aéronautique - Méthodes d'essais - Partie 516: Essai de courbure sévèreAerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 516: Severe cable bend test49.060Aerospace electric equipment and systems33.180.10Fibres and cablesICS:Ta slovenski standard je istoveten z:EN 3745-516:2017SIST EN 3745-516:2017en,fr,de01-maj-2017SIST EN 3745-516:2017SLOVENSKI
STANDARDSIST EN 3745-516:20121DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3745-516
March
t r s y ICS
v {ä r { r Supersedes EN
u y v wæ w s xã t r s tEnglish Version
Aerospace series æ Fibres and cablesá opticalá aircraft use æ Test methods æ Part
w s xã Severe cable bend test Série aérospatiale æ Fibres et câbles optiques à usage aéronautique æ Méthodes d 5essais æ Partie
w s xã Essai de courbure sévère
Luftæ und Raumfahrt æ Faseroptische Leitungen für Luftfahrzeuge æ Prüfverfahren æ Teil
w s xã Schwere Kabelbiegeprüfung This European Standard was approved by CEN on
t { July
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
u y v wæ w s xã t r s y ESIST EN 3745-516:2017
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