1、BRITISH STANDARD AEROSPACE SERIES BS EN 3475-416:2005 Cables, electrical, aircraft use Test methods Part 416: Thermal stability The European Standard EN 3475-416:2005 has the status of a British Standard ICS 49.060 BS EN 3475-416:2005 This British Standard was published under the authority of the St
2、andards Policy and Strategy Committee on 10 February 2006 BSI 10 February 2006 ISBN 0 580 47794 0 National foreword This British Standard is the official English language version of EN 3475-416:2005. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avioni
3、c electrical and fibre optic technology, to Subcommittee ACE/6/-/2, Aerospace Cables, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests
4、 informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referr
5、ed to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisi
6、ons of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI
7、 copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3475416 November2005 ICS49.060 EnglishVersion AerospaceseriesCables,electrical,aircraftuseTest methodsP
8、art416:Thermalstability SriearospatialeCbleslectriquesusage aronautiqueMthodesdessaisPartie416: Vieillissementlachaleur LuftundRaumfahrtElektrischeLeitungenfr LuftfahrtverwendungPrfverfahrenTeil416:Thermische Bestndigkeit ThisEuropeanStandardwasapprovedbyCENon12September2005. CENmembersareboundtocom
9、plywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropean
10、Standardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,Cze
11、chRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITE
12、EFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3475416:2005:EEN 3475-416:2005 2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Preparation of specimens 4 4 Definition of
13、 tests5 5 Test program list .6 6 Requirement 7 EN 3475-416:2005 3 Foreword This European Standard (EN 3475-416:2005) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Ass
14、ociation, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, 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 endor
15、sement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying a
16、ny or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Icela
17、nd, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 4 1 Scope This product standard defines a test method to evaluate the performance of a coaxial cable after thermal stability. It sha
18、ll be used together with EN 3475-100. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment
19、s) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. EN 3475-201, Aerospace series Cables, electrical, aircraft use Test methods Part 201: Visual examination. EN 3475-302, Aerospace series Cables, electrical, aircraft use Test methods Part 302: V
20、oltage proof test. EN 3475-306, Aerospace series Cables, electrical, aircraft use Test methods Part 306: Continuity of conductors. EN 3475-406, Aerospace series Cables, electrical, aircraft use Test methods Part 406: Cold bend test. EN 3475-801, Aerospace series Cables, electrical, aircraft use Test
21、 methods Part 801: Capacitance per unit length. EN 3475-805, Aerospace series Cables, electrical, aircraft use Test methods Part 805: Characteristic impedance. EN 3475-806, Aerospace series Cables, electrical, aircraft use Test methods Part 806: Attenuation. 3 Preparation of specimens 3.1 Specimen T
22、est is to be performed on four specimens. Length of each specimen: First specimen = 150 nominal overall diameter; Second specimen = 75 nominal overall diameter; Third specimen = as specified in the product norm; Fourth specimen = at least three metres. 3.2 Conditioning The specimen shall not be bent
23、 with a radius less than 30 times the overall diameter of the cable, during low or high temperature exposure. EN 3475-416:20055 4 Definition of tests 4.1 Visual examination (EN 3475-201) 4.2 Voltage proof test (EN 3475-302) 4.3 Continuity of conductors (EN 3475-306) 4.4 Capacitance per unit of lengt
24、h (EN 3475-801) 4.5 Attenuation at 200 MHz (EN 3475-806) 4.6 Characteristic impedance (EN 3475-805 Method B) 4.7 Cold bend test (EN 3475-406) Maintain the specimen at the temperature specified in the test method (EN 3475-406) but for 16 hours. During the conditioning period, the specimen shall be ke
25、pt reasonably straight with a weight specified in the product standard. After the conditioning period, and while the specimen is still at the test temperature, the specimen shall be wrapped around the mandrel (diameter of mandrel defined in product standard) for three full turns. The mandrel shall b
26、e turned at a maximum uniform rate of one revolution per four seconds. 4.8 Dynamic winding The entire specimen is wound round a mandrel with a diameter of 15 times the overall nominal diameter of the cable. The specimen is then totally unwound. Duration of a cycle: (30 5) s. Number of cycles: 10. 4.
27、9 Shrinkage measurement Measurement of the distance between inner conductor and dielectric. 4.10 Heat exposure Specimens are placed in a heat chamber for seven days at the temperature specified in the product norm. After the heat exposure period, remove the specimen from the heat chamber and conditi
28、on it at room ambient temperature for 24 hours. EN 3475-416:20056 4.11 Bend test (without ageing) Fix one of the specimen to the mandrel (diameter given in product standard) in such a way that the performance of the cable is unaffected. Turn the mandrel at between two and three turns until 90 % of t
29、he total length is wound round the mandrel whilst ensuring that the bent portion of the cable maintains contact with the mandrel throughout its length. If a load is used to ensure contact with the mandrel then it shall not exceed that given in the product standard. Whilst the cable is still wrapped
30、around the mandrel repeat the measurement of the impedance of the sample. 5 Test program list 5.1 On first specimen initial shrinkage measurement; heat exposure; final shrinkage measurement; visual examination; cold bend test; visual examination; voltage proof test; continuity of conductors. 5.2 On
31、second specimen initial shrinkage measurement; heat exposure; final shrinkage measurement; visual examination; dynamic winding; visual examination; final shrinkage measurement; voltage proof test; continuity of conductors. EN 3475-416:20057 5.3 On third specimen capacitance; transmission loss; heat
32、exposure; capacitance; transmission loss; capacitance variation; transmission variation. 5.4 On fourth specimen initial impedance measurement; bend test; final impedance measurement. 6 Requirement 6.1 On first and second specimens manufacturer marking must be legible. neither splits, nor cracks, sha
33、ll be observed on jacket material. maximum shrinkage at either end shall be less than the value required in the product standard. no breakdown, no discontinuity of conductors. 6.2 On third specimen maximum change of capacitance per unit of length (EN 3475-801): as specified in the product standard.
34、maximum increase of attenuation at 200 MHz (EN 3475-806): as specified in the product standard. 6.3 On fourth specimen maximum change of impedance shall not be greater than that allowed in the product standard. EN 3475-416:2005BS EN 3475-416:2005 BSI 389 Chiswick High Road London W4 4AL BSI British
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