ASD-STAN PREN 3475-411-2013 Aerospace series Cables electrical 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 prEN 3475-411 Edition P 2 September 2013 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 edition P 1 o

2、f November 1999 and will supersede EN 3475-411:2005 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 411: Resistance to fluids Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 411 : Rsistance aux fluides Luft- und Raumfahrt El

3、ektrische Leitungen fr Luftfahrtverwendung Prfverfahren Teil 411: Bestndigkeit gegen Flssigkeiten 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 the needs o

4、f 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 or function

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

6、 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. Edition approved for publication 1 September 2013 Comments should be sent within six months after the date of public

7、ation to ASD-STAN Electrical Domain Copyright 2013 by ASD-STAN prEN 3475-411:2013 (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 ASD-STANs Electrical Do

8、main. 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 3475-411:2013 (E) 3 1 Scope This standard specifies two methods of determining the fluid resistance of a finishe

9、d 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 referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F

10、or 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, electrical, aircraft use Test methods Part 201: Visual examinat

11、ion 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 Cables, electrical, aircraft use Test methods Part 405: Bending

12、at ambient temperature EN 3475-503, Aerospace series Cables, electrical, aircraft use Test methods Part 503: Scrape abrasion EN 3909, Aerospace series Test fluids and test methods for electric components and sub-assemblies ISO 1817, Rubber, vulcanized or thermoplastic Determination of the effect of

13、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 the product standard, all fluids listed in EN 3909 are mandator

14、y. 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 3475-411:2013 (E) 4 4 Procedures 4.1 General 4.1.1 Unless specified in the product specification metho

15、d 2 shall be used. 4.1.2 For each fluid to be tested, take two clean specimens at least off 1m 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 resulting pieces are of sufficient length to allow the post tests

16、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 configuration and maintain at room temperature or as specified in the produ

17、ct 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 is thoroughly wetted. Allow the sample to drain naturally for 5 mi

18、n 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 08160 h. 4.2.3 At the end of the period allow the test sample to ret

19、urn 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 aircraft applications (to be conducted unless over wish specified in t

20、he 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 if the resulting pieces are of sufficient length to allow the po

21、st 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 torsion, but with sufficient tension to ensure the specimen remains fu

22、lly 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 above the surface of the fluid which shall be maintained at the

23、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 08160 h. 4.3.5 At the end of the period allow the test sample to

24、 cool to room temperature, and remain at room temperature for between 1 h and 2 h, before being subjected to final examination. prEN 3475-411:2013 (E) 5 Table 1 Fluid No. Fluid type see EN 3909 Test fluid Flash point Test temperature 1 Fuels Gasoline ISO 1817 Liquid B 4 40 Kerosene ISO 1817 Liquid F

25、 40 70 2 Hydraulic fluid Phosphate ISO 1817 Liquid 103 160 70 Silicone NATOS1714 140 80 Mineral NATOH-520 OM-18 80 80 3 Oils Mineral NATOO1176, OMD-90 200 125 Mineral NATOO142, OM-12 120 70 Synthetic Diester ISO 1817 Liquid 101 260 150 Synthetic Polyol ester NATO160 OX-26 15 150 4 Cleaning fluids So

26、lvent Isopropanol 12 50 Solvent Propanol 25 % White spirit 75 % v/v 25 Solvent Methylethylketone ASTM-D740 4 25 Detergent MIL-PRF-87937D Type IV 25 Sullage AMS 1476B 5 % solution in water v/v 25 5 De-icing Runway 50 % Inhibited Potassium Acetate in Water v/v 25 Ground Ethylene Glycol 80 % Water 20 %

27、 v/v 25 Flight NATO-S-745 AL-5 25 6 Fire Extinguishants See Note 7 Cooling ISO 1817 Liquid 103 177 25 NOTE Because of the nature of 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 conditio

28、ns. Therefore no testing will be performed; 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. prEN 3475-411:2013 (E) 6

29、 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 of the insulation and covering; b) Marking shall remain legible; c) All colour shall remain recognizable. 5.1.2 The cable diameter shall be meas

30、ured 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 the 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.