ASD-STAN PREN 3475-411-2016 Aerospace series Cables electrical aircraft use Test methods Part 411 Resistance to fluids (Edition P 3).pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3475-411 Edition P 3 September 2016 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Supersedes edit

2、ion P 2 of September 2013 and will supersede EN 3475-411:2014 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 411: Resistance to fluids Luft- und Raumfahrt Elektrische Leitungen fr Luftfahrtverwendung Prfverfahren Teil 411: Bestndigkeit gegen Flssigke

3、iten Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 411 : Rsistance aux fluides This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for t

4、he needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically o

5、r functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full Europe

6、an Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical Committee approves that: “This document is published by ASD-STAN for the

7、 needs of the European Aerospace Industry. The use of this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN reviews each standard and technical report a

8、t least every five years at which time it may be revised, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system or transmitted, in an

9、y form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1st September 2016 Comments should be sent within six mo

10、nths after the date of publication to ASD-STAN Electrical Domain Copyright 2016 ASD-STAN prEN 3475-411:2016 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Test fluids 3 4 Procedures 4 5 Requirements . 6 Foreword This standard was reviewed by the Domain Technical Coordinator of A

11、SD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3475-411:2016 (E) 3 1 Scope This standard specifies two methods of determining the fluid r

12、esistance of a finished cable. Method 1: occasional contamination. Method 2: contamination test. It shall be used together with EN 3475-100 and EN 3909. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its appl

13、ication. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General EN 3475-201, Aerospace series Cables,

14、 electrical, aircraft use Test methods Part 201: Visual examination EN 3475-203, Aerospace series Cables, electrical, aircraft use Test methods Part 203: Dimensions EN 3475-302, Aerospace series Cables, electrical, aircraft use Test methods Part 302: Voltage proof test EN 3475-405, Aerospace series

15、Cables, electrical, aircraft use Test methods Part 405: Bending at ambient temperature EN 3475-503, Aerospace series Cables, electrical, aircraft use Test methods Part 503: Scrape abrasion EN 3909, Aerospace series Test fluids for electrical and optical components and sub-assemblies ISO 1817, Rubber

16、, vulcanized or thermoplastic Determination of the effect of liquids MIL-PRF-87937D, Performance specification: cleaning compound, aerospace equipment 1) ASTM D740, Standard Specification for Methyl Ethyl Ketone 2) AMS 1476B, Aircraft toilet flush fluid 2) 3 Test fluids Unless otherwise specified in

17、 the product standard, all fluids listed in EN 3909 are mandatory. 1) Published by: DoD National (US) Mil. Department of Defense. http:/www.defenselink.mil/ 2) Published by: ASTM National (US) American Society for Testing and Materials. http:/www.astm.org/ prEN 3475-411:2016 (E) 4 4 Procedures 4.1 G

18、eneral 4.1.1 Unless specified in the product specification method 2 shall be used. 4.1.2 For each fluid to be tested, take two clean specimens at least off 1 m in length from a finished cable. Where large cables are being tested a single specimen may be divided into two after fluid exposure if the r

19、esulting pieces are of sufficient length to allow the post tests to be correctly carried out. Strip approximately 25 mm of both ends of each specimen. Measure the cable diameter EN 3475-203. 4.2 Method 1: occasional contamination test 4.2.1 Mount the test samples in their normal operating configurat

20、ion and maintain at room temperature or as specified in the product standard. 4.2.2 Dip, brush or spray the test sample with the specified fluid which shall be maintained at the test temperature given in Table 1, or as specified in the product standard. Ensure that the entire surface of the sample i

21、s thoroughly wetted. Allow the sample to drain naturally for 5 min to 10 min; shaking or wiping is not permitted. Transfer the test sample to a test chamber and maintain at the test temperature for the time specified in the product standard. If not specified, the parameters shall be (65 2) C for 081

22、60 h. 4.2.3 At the end of the period allow the test sample to return to room temperature, and remain at room temperature for between 1 h and 2 h, before being subjected to final examination. 4.2.4 Repeat this procedure, if specified by the product standard. 4.3 Method 2: contamination test for aircr

23、aft applications (to be conducted unless over wish specified in the product specifications) 4.3.1 For each fluid to be tested, take two clean specimens at least off 1 m in length from a finished cable. Where large cables are being tested a single specimen may be divided into two after fluid exposure

24、 if the resulting pieces are of sufficient length to allow the post tests to be correctly carried out. 4.3.2 Unless otherwise stated in the product standard, each specimen shall be wound seven complete turns onto a mandrel of diameter 12 times the maximum specified outer cable diameter without torsi

25、on, but with sufficient tension to ensure the specimen remains fully in contact with the mandrel. Remove the mandrel (if necessary the specimen may be tied using lacing cord so as to retain the coils). 4.3.3 Immerse the test two specimens fully in one of the specified test fluid with the ends 150 mm

26、 above the surface of the fluid which shall be maintained at the temperature specified in Table 1 for each of fluids listed in EN 3909 or the cable maximum rated temperature whichever is the lowest for (24 1) h. 4.3.4 Remove the specimens from the fluid and transfer them to a chamber at (65 2) C for

27、 08160 h. 4.3.5 At the end of the period allow the test sample to cool to room temperature, and remain at room temperature for between 1 h and 2 h, before being subjected to final examination. prEN 3475-411:2016 (E) 5 Table 1 (1 of 2) Fluid No. Fluid type, see EN 3909 Test fluid Flash point Test tem

28、perature 1a Fuels Gasoline ISO 1817 Liquid B 4 40 1b Kerosene ISO 1817 Liquid F 40 70 2a Hydraulic fluid Phosphate ISO 1817 Liquid 103 160 70 2b Silicone NATOS1714 140 80 2c Mineral NATOH-520, OM-18 80 80 3a Oils Mineral NATOO1176, OMD-90 200 125 3b Mineral NATOO142, OM-12 120 70 3c Synthetic Dieste

29、r ISO 1817 Liquid 101 260 150 3d Synthetic Polyol ester NATO160 OX-26 15 150 4a Cleaning fluids Solvent Isopropanol 12 50 4b Solvent Ethanol NATOS-738 (Note 1) 16 25 4c Solvent Propanol 25 % White spirit 75 % v/v 25 4d Solvent Methylethylketone ASTM-D740 4 25 4e Detergent MIL-PRF-87937D Type IV 25 4

30、f Sullage AMS 1476B 5 % solution in water v/v 25 5a De-icing Runway 50 % Inhibited Potassium Acetate in Water v/v 25 5b Ground Ethylene Glycol 80 % Water 20 % v/v 25 5d Flight NATO-S-745 AL-5 25 prEN 3475-411:2016 (E) 6 Table 1 (2 of 2) Fluid No. Fluid type, see EN 3909 Test fluid Flash point Test t

31、emperature 6 Fire Extinguishants See Note 2. 7a Cooling ISO 1817 Liquid 103 177 25 NOTE 1 This fluid was not included in the previous issue and should only be used in standards published after the publication date of this document unless listed in the product standard NOTE 2 Because of the nature of

32、 these products in their normal condition in service i.e. gaseous, it is impossible to perform Fluid immersion tests in a liquid state under standard Laboratory conditions. Therefore no testing will be performed; research into alternative fluids and or test methods is being undertaken at the time of

33、 writing of this standard. Due to restrictions applicable by local laws, fire extinguishants shall not be discharged in non-critical situations. 5 Requirements 5.1 The following fluid exposure the specimen shall be. 5.1.1 Visually inspected EN 3475-201. a) There shall be no crazing or de-lamination

34、of the insulation and covering; b) Marking shall remain legible; c) All colours shall remain recognizable. 5.1.2 The cable diameter shall be measured EN 3475-203 variation of the overall diameter shall not exceed 5 %. 5.2 The coiled part of each sample is then straightened and subjected to one of th

35、e following tests. 5.2.1 Specimen (A) shall be subject to the ambient bend test EN 3475-405 followed by the voltage proof test EN 3475-302, as defined in the product standard. 5.2.2 Specimen (B) shall be subject to. a) Voltage proof test EN 3475-302, as defined in the product standard; b) Scrape abrasion test, according to EN 3475-503 as defined in the product standard for ambient temperature.