ASD-STAN PREN 3745-411-2017 Aerospace series Fibres and cables optical aircraft use Test methods Part 411 Resistance to fluids (Edition P 2).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3745-411 Edition P 2 February 2017 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.orgICS: 49.060 Supers

2、edes edition P 1 of September 2006 and will supersede EN 3745-411:2008 Descriptors: ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 411: Resistance to fluids Luft- und Raumfahrt Elektrischen Leitungen fr Luftfahrt Verwendung Prfverfahren Teil 411: Bestndig

3、keit gegen Flssigkeiten 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

4、 is published for the 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 aff

5、ected, physically or 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 transforma

6、tion to full European 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

7、by ASD-STAN for the 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

8、 technical report at 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

9、 transmitted, in any 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 1stFebruary 2017 Comments should be s

10、ent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2017 ASD-STAN prEN 3745-411:2017 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Test fluids 3 4 Cleaning 3 5 Preparation of test specimens 4 6 Procedures 4 7 Final examination . 5 8 Requi

11、rements . 6 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-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 37

12、45-411:2017 (E) 3 1 Scope This standard specifies two methods of determining the fluid resistance of a fibre optic interconnection device. It shall be used together with EN 3745-100 and EN 3909. 2 Normative references The following documents, in whole or in part, are normatively referenced in this d

13、ocument and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3745-100, Aerospace series Fibres and cables, optical, aircraft use Test methods Part

14、100: General EN 3745-201, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 201: Visual examination EN 3745-203, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 203: Cable dimensions EN 3745-503, Aerospace series Fibres and cables, optical, aircr

15、aft use Test methods Part 503: Scrape abrasion EN 3909, Aerospace series Test fluids and test methods for electrical and optical components and sub-assemblies 3 Test fluids Unless otherwise specified in the product standard, all fluids listed in Table 1 are mandatory and are taken from EN 3909. 4 Cl

16、eaning 4.1 Initial cleaning Unless otherwise specified in the product standard, the test sample shall be thoroughly cleaned to remove unrepresentative coatings i.e. preservatives, grease or contaminants. When a separate sample is specified for each fluid, only initial cleaning applies. 4.2 Intermedi

17、ate cleaning If sequential testing is required, the product standard shall specify any necessary cleaning method. When more than one fluid is to be applied to a test sample, the following should be considered: The need to assess the effect of individual fluids; The possibility of synergistic effects

18、 from applying successive fluids; prEN 3745-411:2017 (E) 4 If the order of exposure to fluids in service life is known, or if the exposure to fluids recognized as having synergistic effects is known and is possible in service life, then this order should be specified; Whether the test sample should

19、be cleaned between or after the test. NOTE Choice of cleaning fluid shall clearly not result in further contamination. Some of the specified fluids may be used as a cleaning fluid (e.g. aviation fuel, solvents, cleaning fluids) otherwise a fluid known to be used in normal cleaning procedures should

20、be used. 4.3 Final cleaning The product standard shall specify any necessary cleaning method prior to final examination. For each fluid to be tested, take a clean specimen at least 1 m in length from a finished cable. If necessary an initial cleaning may be performed according to EN 3909. 5 Preparat

21、ion of test specimens 5.1 General Unless specified in the product standard separate test samples are to be used for each fluid, they shall cleaned in accordance 5.1. All samples shall be visually inspected and there condition recorded. 5.2 Cables For each fluid to be tested, take a specimen at least

22、 1 m in length from the finished cable. Measure the cables diameter EN 3745-203. Unless specified in the product standard cables are not to be cleaned before testing. Unless otherwise stated in the product standard, each specimen shall be wound seven complete turns onto a mandrel of diameter 12 time

23、s the maximum outer diameter of the specimen without torsion, but with sufficient tension to ensure the specimen remains fully in contact with the mandrel. Remove the mandrel. 6 Procedures There are two test procedures, depending upon the components intended application. 6.1 Test method 1: occasiona

24、l contamination This method is intended to test materials and components which intended to be used in applications were contamination is accidental and occasional. 6.1.1 Mount the test sample in its normal operating configuration and maintain at room temperature, or as specified in the product stand

25、ard. prEN 3745-411:2017 (E) 5 6.1.2 Dip 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 is thoroughly wetted. Allow the sample to drain naturall

26、y for the time specified; shaking or wiping is not permitted. 6.1.3 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 as specified in Table 1. 6.1.4 Allow the test sample to return

27、 to room temperature, and remain at room temperature for between 1 h and 2 h, visually examine the specimen. 6.1.5 Repeat this procedure for the number of cycles specified in Table 1. 6.1.6 At the end of the test carry out the final examination and conduct any additional tests required by the produc

28、t standard. 6.2 Test method 2: extended contamination This method is intended to test materials and components such as cables which are intended to be used in applications were contamination is accidental but likely to be prolonged. NOTE In order to assess components which are intended to be routine

29、ly immersed in fluid then this method should be used with extended test exposures. 6.2.1 Immerse the test sample fully in the specified test fluid which shall be maintained at the temperature as given in Table 1 and the duration shall be a minimum of (24 1) h. 6.2.2 Transfer the test sample to a tes

30、t chamber and maintain at the test temperature and for the time specified in the product standard. If not specified, the parameters shall be (65 2) C for (160 - 0 + 8) h. 6.2.3 At the end of the period allow the test sample to cool to room temperature, and remain at room temperature for between 1 h

31、and 2 h, before being subjected to final examination. 7 Final examination 7.1 General Examine the test sample visually and record any change of condition from the initial examination. The test samples other than cables may be cleaned in accordance with 4.3 in order to aid this examination. The produ

32、ct standard shall specify any measurements or tests required. 7.2 Cables After being returned to ambient temperature and without cleaning, examine the test sample visually, according to EN 3745-201 and record any change of condition from the initial examination. Straighten or uncoil the coiled part

33、of the cable. The contaminated specimen shall be subjected to the scrape abrasion test, according to EN 3745-503 as defined in the product standard for ambient temperature prEN 3745-411:2017 (E) 6 8 Requirements Samples shall satisfy the requirements of the product standard unless specified: Compone

34、nt markings shall still be visible; Cables insulation shall not have cracked or crazed; Cables diameter shall not have swollen more than 10 %. prEN3745-411:2017(E) 7 Table 1 (1 of 2) Method 1 and 2 Method 1 Fluid No. Fluid type see EN 3909 Test fluid Flash point C Immersion test temperature 2 C Imme

35、rsion time minutes Drainage time hours Oven cure Cycles Temperature C minimum Time hours 1a Fuels Gasoline ISO1817 Liquid B 4 40 15 7 65 16 5 1b Kerosene ISO1817 Liquid F 40 70 15 7 65 16 5 2a Hydraulic Fluid Phosphate ISO1817 Liquid 103 160 70 15 7 65 16 5 2b Silicone NATO-S-1714 140 80 15 7 65 16

36、5 2c Mineral NATO-H-520 OM-18 80 80 15 7 65 16 5 3a Oils Mineral NATOO-1176, OMD-90 200 125 15 7 65 16 5 3b Mineral NATO-O-142, OM-12 120 70 15 7 65 16 5 3c Synthetic Diester ISO1817 Liquid 101 260 150 15 7 65 16 5 3d Synthetic Polyol ester NATO160, OX-26 15 150 15 7 65 16 5 4a Cleaning fluids Solve

37、nt Isopropanol NATO-S-737, AL 11 12 50 15 7 65 16 5 4b Solvent Ethanol NATO-S-738 25 15 7 65 16 5 4c Solvent Propanol 25 % + White spirit 75 % v/v 25 15 7 65 16 5 4d Solvent Methylethylketone ASTM-D740 4 25 15 7 65 16 5 prEN3745-411:2017(E) 8 Table 1 (2 of 2) Method 1 and 2 Method 1 Fluid No. Fluid

38、type see EN3909 Test fluid Flash point C Immersion test temperature 2 C Immersion time minutes Drainage Time hours Oven cure Cycles Temperature C minimum Time hours 4e Detergent MIL-PRF-87937 Type IV 25 15 7 65 16 5 4f Sullage AMS 1476B 5 % solution in water v/v 25 15 7 65 16 5 5a De icers Runway 50

39、 % Inhibited Potassium Acetate in Water v/v 25 15 7 65 16 5 5b Ground Ethylene Glycol 80 % + Water 20 % v/v 25 15 7 65 16 5 5d Flight NATO-S-745 AL-5 25 15 7 65 16 5 6a Fire Extinguishant Note 1 7a Cooling ISO 1817 Liquid 103 177 25 15 7 65 16 5 NOTE 1 Because of the nature of these products in thei

40、r 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 with these materials. Research into alternative fluids and or test methods is being undertaken at the time of writing of this standard. Due to restrictions applicable by local laws, fire extinguishants shall not be discharged in non-critical situations