SIST EN 4533-003:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 003: Praktiken zur Fertigung und Installation von LeitungsbündelnSérie aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 003: Règles de l'art pour la fabrication et l'installation des harnaisAerospace series - Fibre optic systems - Handbook - Part 003: Looming and installation practices49.060Aerospace electric equipment and systems33.180.01VSORãQRFibre optic systems in generalICS:Ta slovenski standard je istoveten z:EN 4533-003:2017SIST EN 4533-003:2018en,fr,de01-marec-2018SIST EN 4533-003:2018SLOVENSKI
STANDARDSIST EN 4533-003:20091DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4533-003
December
t r s y ICS
v {ä r x r Supersedes EN
v w u uæ r r uã t r r xEnglish Version
Aerospace series æ Fibre optic systems æ Handbook æ Part
r r uã Looming and installation practices Série aérospatiale æ Systèmes des fibres optiques æ Manuel d 5utilisation æ Partie
r r uã Règles de l 5art pour la fabrication et l 5installation des harnais
Luftæ und Raumfahrt æ Faseroptische Systemtechnik æ Handbuch æ Teil
r r uã Praktiken zur Fertigung und Installation von Leitungsbündeln This European Standard was approved by CEN on
t u July
t r s yä
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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CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
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
v w u uæ r r uã t r s y ESIST EN 4533-003:2018

Part 003: Looming and installation practices Part 004: Repair, maintenance, cleaning and inspection b) Background It is widely accepted in the aerospace industry that photonic technology significant advantages over conventional electrical hardware. These include massive signal bandwidth capacity, electrical safety, and immunity of passive fibre-optic components to the problems associated with electromagnetic interference (EMI). Significant weight savings can also be realized in comparison to electrical harnesses which may require heavy screening. To date, the EMI issue has been the critical driver for airborne fibre-optic communications systems because of the growing use of non-metallic aerostructures. However, future avionic requirements are driving bandwidth specifications from 10’s of Mbits/s into the multi-Gbits/s regime in some cases, i.e. beyond the limits of electrical interconnect technology. The properties of photonic technology can potentially be exploited to advantage in many avionic applications, such as video/sensor multiplexing, flight control signalling, electronic warfare, and entertainment systems, as well as sensor for monitoring aerostructure. The basic optical interconnect fabric or `optical harness’ is the key enabler for the successful introduction of optical technology onto commercial and military aircraft. Compared to the mature telecommunications applications, an aircraft fibre-optic system needs to operate in a hostile environment (e.g. temperature extremes, humidity, vibration, and contamination) and accommodate additional physical restrictions imposed by the airframe (e.g. harness attachments, tight bend radii requirements, and bulkhead connections). Until recently, optical harnessing technology and associated practices were insufficiently developed to be applied without large safety margins. In addition, the international standards did not adequately cover many aspects of the life cycle. The lack of accepted standards thus lead to airframe specific hardware and support. These factors collectively carried a significant cost penalty (procurement and through-life costs), that often made an optical harness less competitive than an electrical equivalent. This situation is changing with the adoption of more standardized (telecoms type) fibre types in aerospace cables and the availability of more ruggedized COTS components. These improved developments have been possible due to significant research collaboration between component and equipment manufacturers as well as the end use airframers. SIST EN 4533-003:2018

EN 3197, Aerospace series — Design and installation of aircraft electrical and optical interconnection systems EN 4533-001, Aerospace series — Fibre optic systems — Handbook — Part 001: Termination methods and tools EN 4533-002, Aerospace series — Fibre optic systems — Handbook — Part 002: Test and measurement EN 4533-004, Aerospace series — Fibre optic systems — Handbook — Part 004: Repair, maintenance and inspection 3 Initial design considerations 3.1 General Wherever possible the installation of fibre optic links and bundles should aim to mirror that of copper systems and comply as much as possible with current general aircraft electrical harness procedures. There are numerous installation specifications detailing the requirements for the routing of copper based harnesses, however they are very similar in content, therefore fibre optic harness routing will have to fulfil the following criteria: a) Accessibility for inspection and maintenance; b) Prevent or minimise the risk of damage from:  Chafing, scraping or abrasion;  Use as handholds or as support for personal equipment;  Damage by personnel moving within the aircraft;  Stowage or movement of cargo;  Battery electrolytes and fumes; SIST EN 4533-003:2018

In turn this capability has to be traded against the possibility that the additional interconnects may increase the insertion loss of the links reducing the reliability of the system. Experience has shown that failures at or near to the interconnect are not an uncommon failure mode, particularly where loads placed on the links are easily transferred to the interconnect assembly and associated accessories. Careful placement of the interconnect and the correct use of appropriate harness tie-down mechanisms will reduce the likelihood of this type of failure. SIST EN 4533-003:2018
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