EN 4533-003-2017 en Aerospace series - Fibre optic systems - Handbook - Part 003 Looming and installation practices.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Aerospace series - Fibre optic systems - HandbookPart 003: Looming and installation practicesBS EN 4533-003:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4533-003 December 2017 ICS 49.060 Supersedes EN 4533-0

2、03:2006English Version Aerospace series - Fibre optic systems - Handbook - Part 003: Looming and installation practices Srie arospatiale - Systmes des fibres optiques - Manuel dutilisation - Partie 003: Rgles de lart pour la fabrication et linstallation des harnais Luft- und Raumfahrt - Faseroptisch

3、e Systemtechnik - Handbuch - Teil 003: Praktiken zur Fertigung und Installation von Leitungsbndeln This European Standard was approved by CEN on 23 July 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th

4、e 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, Fren

5、ch, 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,

6、 Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

7、 Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membe

8、rs. Ref. No. EN 4533-003:2017 ENational forewordThis British Standard is the UK implementation of EN 4533-003:2017. It supersedes BS EN 4533-003:2006, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic t

9、echnology.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by

10、BSI Standards Limited 2018ISBN 978 0 580 98306 1ICS 49.060Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2018.Amendments/corrigenda issued since publ

11、icationDate Text affectedBRITISH STANDARDBS EN 4533-003:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4533-003 December 2017 ICS 49.060 Supersedes EN 4533-003:2006English Version Aerospace series - Fibre optic systems - Handbook - Part 003: Looming and installation practices Srie arospati

12、ale - Systmes des fibres optiques - Manuel dutilisation - Partie 003: Rgles de lart pour la fabrication et linstallation des harnais Luft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 003: Praktiken zur Fertigung und Installation von Leitungsbndeln This European Standard was approve

13、d by CEN on 23 July 2017. 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 stan

14、dards 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 n

15、otified 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary,

16、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-

17、CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4533-003:2017 EBS EN 4533-003:2017EN 4533-003:2017 (E) 2 Contents Page European Foreword 3 Introduction 4 1 Scope 5 2

18、 Normative references 5 3 Initial design considerations 5 3.1 General 5 3.2 System design considerations 7 3.3 Practical harness routing considerations . 10 3.4 Securing and attachment mechanisms . 10 3.5 Protection mechanisms . 13 3.6 Installation mechanisms . 16 3.7 Through life support . 16 3.8 E

19、nabling Fibre optic cable re-termination 17 3.9 Handling 19 BS EN 4533-003:2017EN 4533-003:2017 (E) 3 European Foreword This document (EN 4533-003:2017) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out

20、 in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publi

21、cation of an identical text or by endorsement, at the latest by June 2018 and conflicting national standards shall be withdrawn at the latest by June 2018. 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 resp

22、onsible for identifying any or all such patent rights. This document supersedes EN 4533-003:2006. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyp

23、rus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and t

24、he United Kingdom. BS EN 4533-003:2017EN 4533-003:2017 (E) 4 Introduction a) The Handbook This handbook aims to provide general guidance for experts and non-experts alike in the area of designing, installing, and supporting fibre-optic systems on aircraft. Where appropriate more detailed sources of

25、information are referenced throughout the text. It is arranged in 4 parts, which reflect key aspects of an optical harness life cycle, namely: Part 001: Termination methods and tools Part 002: Test and measurement Part 003: Looming and installation practices Part 004: Repair, maintenance, cleaning a

26、nd 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 associ

27、ated 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

28、-metallic aerostructures. However, future avionic requirements are driving bandwidth specifications from 10s 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 adv

29、antage 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 introductio

30、n 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 rest

31、rictions 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 standa

32、rds 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 tha

33、n 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 comp

34、onent and equipment manufacturers as well as the end use airframers. BS EN 4533-003:2017EN 4533-003:2017 (E) 5 1 Scope This handbook considers best practice during initial design and how the practices chosen affect through life support of the installation. Looming and installation practices are a cr

35、itical aspect of any aircraft electrical/avionics installation. In order to provide a reliable and efficient system it is important that the fibre optic installation is designed for reliability and maintainability. This document provides technical advice and assistance to designers and engineers on

36、the incorporation of fibre optic harnesses into an airframe, while, wherever possible, maintaining maximum compliance with current aircraft electrical harness procedures. All topics that are related to Installation of optical cables are addressed in EN 3197. These rules are applicable for fibre opti

37、c cables and connectors defined by EN specifications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest e

38、dition of the referenced document (including any amendments) applies. 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

39、 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 mi

40、rror 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

41、 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

42、or movement of cargo; Battery electrolytes and fumes; BS EN 4533-003:2017EN 4533-003:2017 (E) 6 Stones, ice, mud and burst tyre debris in landing gear bays; Combat damage (to the maximum extent practicable); Loose or moving parts; Moisture and fluids; Localised high temperatures; Frequent mating and

43、 de-mating of connectors; Exposure to high temperature/high vibration areas. Copper installations are prone to electrical interference and their use is restricted in “volatile” zones. Fibre optic cables are immune to electrical interference and are ideally suited for use in, or routing through “vola

44、tile” zones. Examples of areas that fibre optic harnesses may provide a better solution over copper include: a) Areas where there are high levels of electrical field; b) Areas where electric fields need to be kept to a minimum, e.g. compass deviation; c) Routing through and close to fuel tanks; d) C

45、lose proximity to electrically initiated explosive devices (EIEDs) and their systems. During the design phase of a fibre optic installation routing considerations need to be addressed when determining the optimum routing, these include: a) System criticality; b) Harness accessibility, improves on-ai

46、rcraft repair and maintenance, but should not degrade system protection; c) System segregation and redundancy, maximisation of damage limitation; d) Accessibility of connectors; e) System and component repair and maintenance issues (it is noted that design of common harness lengths on an aircraft ma

47、y improve the supportability (common spares inventory) if repairs are required); f) Introduction of dormant fibre in harnesses and/or extra fibre lengths may reduce on-aircraft repair times. BS EN 4533-003:2017EN 4533-003:2017 (E) 7 3.2 System design considerations 3.2.1 Introduction In the design o

48、f a fibre optic harness, the link topology and the available routing path on the platform will dictate the physical length of the harness and any required branching of the assembly. If the fibre optic installation is to be installed on an existing platform, then possible routing paths may be restric

49、ted (due to existing infrastructure and equipment). However if the platform is a new build, then there may be more freedom to design the routing path. It is noted that fibre optic design software has been developed to assist in the layout of fibre optic harnessing. This can be used to model different paths and also calculate insertion loss of the link, depending on the path route. A small number of commercial packages are believed to be available. These can also predict losses associated with installation bends o