EN 4533-004:2018

Aerospace series - Fibre optic systems - Handbook - Part 004: Repair, maintenance, cleaning and inspection

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 finally, repairing it. The second covers the recommended procedures for upkeep and maintaining harness health over the lifetime of its installation.

Luft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 004: Reparatur, Instandhaltung, Reinigung und Inspektion

Série aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 004 : Réparation, maintenance, nettoyage et contrôle

Le présent manuel présente les règles de l’art relatives à l’ « Analyse des pannes et réparation » ainsi qu’à
la « maintenance et au contrôle des liaisons de fibres optiques ». Le premier traite des actions à mener en
cas de dysfonctionnement - comment aller de la notification d’une panne à la localisation de celle-ci et
enfin, procéder à sa réparation. Le second traite des procédures recommandées pour les frais d’entretien
et le maintien en bon état d’un harnais pendant toute la durée de vie de son installation.

Aeronavtika - Sistemi iz optičnih vlaken - Priročnik - 004. del: Popravila, vzdrževanje in nadzor

General Information

• Status: Published
• Publication Date: 09-Jan-2018
• Withdrawal Date: 30-Jul-2018
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2 - Electrical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Jan-2018
• Completion Date: 10-Jan-2018
• Ref Project: SIST EN 4533-004:2018 - Aerospace series - Fibre optic systems - Handbook - Part 004: Repair, maintenance, cleaning and inspection

Relations

• Replaces: EN 4533-004:2006 - Aerospace series - Fibre optic systems - Handbook - Part 004: Repair, maintenance and inspection
• Effective Date: 17-Jan-2018

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.3RSUDYLODLuft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 004: Reparatur, Wartung und InspektionSérie aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 004 : Réparation, maintenance, nettoyage et contrôleAerospace series - Fibre optic systems - Handbook - Part 004: Repair, maintenance, cleaning and inspection49.060Aerospace electric equipment and systems33.180.01VSORãQRFibre optic systems in generalICS:Ta slovenski standard je istoveten z:EN 4533-004:2018SIST EN 4533-004:2018en,fr,de01-marec-2018SIST EN 4533-004:2018SLOVENSKI
STANDARDSIST EN 4533-004:20091DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4533-004
January
t r s z ICS
v {ä r x r Supersedes EN
v w u uæ r r vã t r r xEnglish Version
Aerospace series æ Fibre optic systems æ Handbook æ Part
r r vã Repairá maintenanceá cleaning and inspection Série aérospatiale æ Systèmes des fibres optiques æ Manuel d 5utilisation æ Partie
r r v ã Réparationá maintenanceá nettoyage et contrôle
Luftæ und Raumfahrt æ Faseroptische Systemtechnik æ Handbuch æ Teil
r r vã Reparaturá Wartung und Inspektion 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
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s z 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 vã t r s z ESIST EN 4533-004:2018

Contents Page European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Fault analysis . 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 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
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 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 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 4533-004:2018

3 Fault analysis 3.1 Fault notification A fault notification will arise from one or more of three sources; scheduled 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 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 aircraft’s systems to diagnose themselves. It should identify all faults that occur in the time 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 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 powe
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