1、BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 Aerospace series Fibre optic systems Handbook Part 004: Repair, maintenance, cleaning and inspection BS EN 4533-004:2018 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4533-004 January 2018 ICS 49.060 Supersedes
2、 EN 4533-004:2006 English Version Aerospace series - Fibre optic systems - Handbook - Part 004: Repair, maintenance, cleaning and inspection Srie arospatiale - Systmes des fibres optiques - Manuel dutilisation - Partie 004 : Rparation, maintenance, nettoyage et contrle Luft- und Raumfahrt - Faseropt
3、ische Systemtechnik - Handbuch - Teil 004: Reparatur, Wartung und Inspektion 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 the status of a national
4、 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
5、 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, Czec
6、h 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 United Kin
7、gdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4533-0
8、04:2018 E National foreword This British Standard is the UK implementation of EN 4533-004:2018. It supersedes BS EN 4533-004:2006, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology. A list o
9、f 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 BSI Standards Lim
10、ited 2018 ISBN 978 0 580 98307 8 ICS 49.060 Compliance 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 28 February 2018. Amendments/corrigenda issued since publication Dat
11、e Text affected BRITISH STANDARD BS EN 4533-004:2018 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4533-004 January 2018 ICS 49.060 Supersedes EN 4533-004:2006 English Version Aerospace series - Fibre optic systems - Handbook - Part 004: Repair, maintenance, cleaning and inspection Srie arosp
12、atiale - Systmes des fibres optiques - Manuel dutilisation - Partie 004 : Rparation, maintenance, nettoyage et contrle Luft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 004: Reparatur, Wartung und Inspektion This European Standard was approved by CEN on 23 July 2017. CEN members ar
13、e 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
14、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 Ce
15、ntre 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, Iceland, Ireland, Italy, Latvia, Lithua
16、nia, 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-CENELEC Management Centre: Avenue Marnix
17、 17, B-1000 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4533-004:2018 E BS EN 4533-004:2018EN 4533-004:2018 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Fault analy
18、sis 6 3.1 Fault notification . 6 3.2 Symptoms . 6 3.3 Potential faults . 7 3.4 Fault identification and location 10 4 Repair techniques 13 4.1 General . 13 4.2 Splice . 13 4.3 Structural repair . 14 4.4 Terminus recovery 14 5 Inspection and cleaning . 16 5.1 End face inspection 16 5.2 Cleaning . 20
19、6 Scheduled maintenance and inspection 24 6.1 When to maintain/Inspect? 24 6.2 Maintenance/Inspection of system . 25 6.3 Maintenance/Inspection of components . 26 Annex A (normative) Termini end face contamination . 27 Annex B (normative) Cleaning Methods . 32 B.1 Method 1 32 B.2 Method 2 34 BS EN 4
20、533-004:2018EN 4533-004:2018 (E) 3 European foreword This document (EN 4533-004:2018) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard ha
21、s 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 publication of an identical text or by endorsement, at the latest by Jul
22、y 2018 and conflicting national standards shall be withdrawn at the latest by July 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 responsible for identifying any or all such patent rights. This documen
23、t supersedes EN 4533-004:2006. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Rep
24、ublic 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 the United Kingdom. BS EN 4533-004:2018EN 4533-004:2018 (E) 4 Introd
25、uction 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 information are referenced throughout the text. It is arranged in 4
26、 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 and inspection b) Background It is widely accepted in the aerospace
27、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 sa
28、vings 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
29、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 advantage in many avionic applications, such as video/sensor multiplex
30、ing, 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. Comp
31、ared 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 b
32、end 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 la
33、ck 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 ado
34、ption 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
35、. BS EN 4533-004:2018EN 4533-004:2018 (E) 5 1 Scope The handbook gives guidelines related to Fault analysis and repair as well as maintenance and inspection of fibre optic links. The first deals with what to do when something goes wrong how to go from a fault notification to locating the fault, and
36、finally, repairing it. The second covers the recommended procedures for upkeep and maintaining harness health over the lifetime of its installation. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its applicat
37、ion. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 4533-001, Aerospace series Fibre optic systems Handbook Part 001: Termination methods and tools EN 4533-002, Aerospace series Fibre
38、optic systems Handbook Part 002: Test and measurement EN 4533-003, Aerospace series Fibre optic systems Handbook Part 003: Looming and installation practices EN 2591-601, Aerospace series Elements of electrical and optical connection Test methods Part 601: Optical elements Insertion loss EN 3733 (al
39、l parts), Aerospace series Connector, optical, circular, single channel, coupled by self-locking ring, operating temperature up to 150 C continuous EN 4531-101, Aerospace series Connectors, optical, circular, single and multipin, coupled by threaded ring Flush contacts Part 101: Optical contact for
40、EN 4641-100 cable 55 C to 125 C Product standard EN 4639-101, Aerospace series Connectors, optical, rectangular, modular, multicontact, 1,25 diameter ferrule, with removable alignment sleeve holder Part 101 : Optical contact for cable EN 4641-100 Operating temperatures between 65 C and 125 C Product
41、 standard EN 4645 (all parts), Aerospace series Connectors, optical, circular, single and multipin, coupled by threaded ring, self-locking 1,25 mm diameter ferrule with removable alignment sleeve holder IEC 60825-1, Safety of laser products Part 1: Equipment classification, requirements and users gu
42、ide IEC 61300-3-35, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-35: Examinations and measurements Visual inspection of fibre optic connectors and fibre-stub transceivers ARINC 805, Harsh environment fibre optic connectors/testing SAE-AS5675
43、, Characterization and requirements for new aerospace fibre optic cable assemblies Jumpers, end face geometry, link loss measurement, and inspection BS EN 4533-004:2018EN 4533-004:2018 (E) 6 3 Fault analysis 3.1 Fault notification A fault notification will arise from one or more of three sources; sc
44、heduled maintenance, Built-In-Test (BIT), or failure of equipment. Ideally, scheduled maintenance should highlight all latent faults i.e. those which initially have no effect on the system performance but may lead to a problem sometime later during aircraft operation. It should also highlight faults
45、 of the gradual degradation type i.e. those which gradually deteriorate the system performance but have yet to cause a failure and any other faults that slipped through the BIT net. BIT is the ability of the aircrafts systems to diagnose themselves. It should identify all faults that occur in the ti
46、me between scheduled maintenance and, with the exception of sudden catastrophic faults, before a failure occurs. It should also be able to provide some help in locating the fault. Failure is the worst case and should only be the result of a fault occurring which cannot be prepared for. 3.2 Symptoms
47、This is where differences between fibre optic and electrical installations become apparent. The most common symptom in a fibre optic link is complete or partial loss of optical power. This occurs when light breaks its confinement from the fibre core and can be the result of damage to the fibre or in
48、terconnect. It can also be the result of contamination of the fibre optic terminus end face, excessive pressure, crushing or severe bending on the fibre optic cable. Depending on the magnitude of the loss, the result may be a fault that is above or below the link threshold a fault below the link thr
49、eshold is a failure. Severe damage, such as an optical fibre break may induce a complete loss of optical power. Intermittent optical signals are possible and may be the result of fibre movement e.g. vibration or bending of a fibre. An increase in optical power is also possible although this is more likely to be due to stability of the light source rather than the link itself. Gradual degradation of optical power is an important symptom to be able to detect as it could indicate the ons
