1、ASD STANDARD NORME ASD ASD NORM prEN 3838 Edition P 2 October 2009 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 1 of Septemb
2、er 1995 Descriptors: ENGLISH VERSION Aerospace series Requirements and tests on user-applied markings on aircraft electrical cables Srie arospatiale Exigences et mthodes dessais sur les marquages utilisateurs de cbles lectriques aronautiques Luft- und Raumfahrt Anforderungen und Prfungen der Anwende
3、rkennzeichnung auf elektrischen Luftfahrzeugleitungen 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 of the European Aerospace Industry. It has be
4、en 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 functionally, without re-identification of the stand
5、ard. 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 national members have then to implement the
6、 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 31 October 2009 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright
7、 2009 by ASD-STAN prEN 3838:2009 (E) 2 Contents Page Foreword2 Introduction .3 1 Scope 3 2 Normative references 3 3 Terms and definitions .4 4 Qualification tests4 5 Acceptance tests .5 6 Test methods6 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 3838:2009 (E) 3 Introduction Durability of function-related marking of aircraft electrical cables is of great im
9、portance throughout the life of an aircraft, during initial assembly, operation and maintenance operations in service. Markings shall, therefore, be made to a sufficiently high standard to satisfy requirements initially and for the remainder of the expected life marked cable or equipment containing
10、it. Markings are applied by the user to the cable insulation, jacket or sheath and shall not degrade the performance of the cable. They shall be applied in accordance with design requirements using a process approved by the Design Authority. 1 Scope This standard specifies tests that shall be perfor
11、med on markings applied by the user to ensure that their durability is satisfactory and that, after application of markings directly to the cable insulation, jacket or sheath, the cable will meet the performance requirements laid down. 2 Normative references The following referenced documents are in
12、dispensable 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 amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: Gene
13、ral 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: Voltage proof test EN 3475-401, Aerospace series Cables, electrical, aircraft use Test methods Part 401:
14、Accelerated ageing EN 3475-405, Aerospace series Cables, electrical, aircraft use Test methods Part 405: Bending at ambient temperature EN 3475-411, Aerospace series Cables, electrical, aircraft use Test methods Part 411: Resistance to fluids EN 3475-703, Aerospace series Cables, electrical, aircraf
15、t use Test methods Part 703: Permanence of manufacturers marking EN 3475-705, Aerospace series Cables, electrical, aircraft use Test methods Part 705: Contrast measurement ISO 4892-3, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps prEN 3838:2009 (E) 4 3 Terms a
16、nd definitions For the purposes of this document, the following terms and definitions apply. For other definitions see EN 3475-100. 3.1 marking an identification mark applied directly to the cable insulation, jacket or sheath by any process that meets the requirements of this standard. The markings
17、shall be in accordance with the design requirements 3.2 aggressive marking system marking which can deform or damage the insulating layer of a cable. Hot-stamp is defined as such a method. Other methods of marking may be defined as aggressive by the Official Services 4 Qualification tests 4.1 Tests
18、The tests in Table 1 shall be performed at the introduction of the marking process, at every change in technology or processing technique affecting the cable insulation, jacket or sheath or as required by the Official Services. Tests shall be performed on the sizes for qualification defined in the c
19、able specification for each colour, material and construction of cable, jacket and sheath which will be directly marked. Before the tests defined in Table 1 are performed on specimens of user marked cable, ensure that the specimens have been subjected to any post marking curing which is normal for t
20、he defined marking process. Table 1 Title Subclause Visual examination of markings 6.1 Permanence of markings 6.2 Resistance to fluids 6.3 Heat ageing 6.4 Exposure to light 6.5 Marking contrast 6.6 Bending at ambient temperature 6.7 4.2 Test sequence The number of specimens for each test and the seq
21、uence of testing shall be as laid down in Table 2. Each specimen shall be taken sequentially from a continuous length of cable. prEN 3838:2009 (E) 5 Table 2 TestsGroupNumber of specimens Title Subclause Visual examination of markings 6.1 Marking contrast 6.6 1 5 Permanence of markings 6.2 Visual exa
22、mination of markings 6.1 Resistance to fluids 6.3 2 1 per fluid Marking contrast 6.6 Visual examination of markings 6.1 Heat ageing 6.4 3 3 Marking contrast 6.6 Visual examination of markings 6.1 Exposure to light 6.5 4 3 Visual examination of markings 6.1 Visual examination of markings 6.1 5 a 3 Be
23、nding at ambient temperature 6.7 aGroup 5 tests only performed on markings made by aggressive marking systems. 5 Acceptance tests The tests in Table 3 shall be performed on each production batch of markings. Visual examination shall be made on specimens taken each time production is started, (e.g. a
24、t start of day or shift), at the beginning and end of each production run and at intervals not exceeding 10 000 m for single core cables and 800 m for multicore and screened cables. Table 3 Title Subclause Applicable Visual examination of markings 6.1 All marking systems 6.8 Voltage test subclause 6
25、.8.4.1 or 6.8.4.2 continuously Tests on aggressive marking systems prEN 3838:2009 (E) 6 6 Test methods 6.1 Visual examination of markings 6.1.1 Object The markings shall be examined to ensure that they are legible and comply with the specified requirements in respect of size and style of print and c
26、olour if specified. 6.1.2 Apparatus A light source which provides an illumination of 500 lx min. on a flat work surface. 6.1.3 Test specimen The test specimen shall be a length of marked cable. The specimen shall not be tested until all drying, cooling or curing has been completed in accordance with
27、 the process specification. 6.1.4 Procedure The test specimen shall be placed flat on the work surface and shall be visually examined from a distance of 0,3 m without additional magnification other than spectacles if worn. For initial examination only, a magnification of between six times and 10 tim
28、es shall be used to inspect for any mechanical damage to the insulation or conductors (EN 3475-201). 6.1.5 Requirements The legend of the marking shall be uniform and clearly legible. Each individual character shall be easily identified. In any case of disagreement concerning compliance with these c
29、onditions, the marking contrast test in 6.6 shall be performed. 6.2 Permanence of markings 6.2.1 Object The marking shall be tested to ensure that it will withstand the specified scrape abrasion and retain legibility. 6.2.2 Apparatus See EN 3475-703, Clause 4. 6.2.3 Test specimen See 6.1.3. 6.2.4 Pr
30、ocedure See EN 3475-703, except that the load shall be 1 N and the number of cycles shall be 50 for ink jet marking and 100 for all other types of marking. prEN 3838:2009 (E) 7 6.2.5 Requirements The printing shall remain legible as in 6.1 and comply with Clause 5 of EN 3475-703 except that one of t
31、he five specimens may not be completely legible if this is due to a local defect of the cable top coat. 6.3 Resistance to fluids 6.3.1 Object The marking shall be tested to ensure that it remains legible after immersion in the test fluids specified in EN 3475-411. 6.3.2 Apparatus Suitable containers
32、 for immersing specimens and maintaining specified test temperature for duration of immersion. 6.3.3 Specimen See 6.1.3. 6.3.4 Procedure One specimen shall be immersed in each test fluid specified in EN 3475-411 for the time and temperature stated. At the conclusion of immersion the specimens shall
33、be removed from the fluids and after draining for 1 h at ambient temperature shall be dried by dabbing (not wiping) with a lint-free cloth and shall be visually examined. 6.3.5 Requirements See 6.1. Any deviation shall be reported. 6.4 Heat ageing 6.4.1 Object The marking shall be tested to ensure t
34、hat it remains legible when heat aged at the temperature specified in the cable product standard. 6.4.2 Apparatus See EN 3475-401, Clause 4. 6.4.3 Specimen See 6.1.3 and Clause 3 of EN 3475-401. 6.4.4 Procedure Specimen shall be placed in an oven for 168 h at the cable operating temperature as speci
35、fied in the product standard for the cable. See EN 3475-401. prEN 3838:2009 (E) 8 6.4.5 Requirements The specimen shall meet the requirements of 5.4 of EN 3475-401 and the marking shall remain legible as in 6.1. 6.5 Exposure to light 6.5.1 Object The marking shall be tested to ensure that it remains
36、 legible after exposure to laboratory light sources. 6.5.2 Apparatus See ISO 4892-3, lamp type 1. 6.5.3 Specimen See 6.1.3. 6.5.4 Procedure See ISO 4892-3. The specimen shall be mounted so that the marks being tested face the light source and unless other wise specified in the product standard expos
37、ure mode 1 used. 6.5.5 Requirements Unless otherwise specified in the concerned product standard, after exposure for 168 h the contrast, as measured in 6.6, shall be not less than 40 %. 6.6 Marking contrast 6.6.1 Object The marking shall be examined to ensure that there is sufficient contrast betwee
38、n it and the surface on which it is made for its legibility to be acceptable in all light conditions. 6.6.2 Apparatus See EN 3475-705. 6.6.3 Test specimen See 6.1.3. 6.6.4 Procedure See EN 3475-705. 6.6.5 Requirements Unless otherwise specified in the concerned product standard, the contrast shall b
39、e not less than: 50 % initially; 40 % after application of specified tests. prEN 3838:2009 (E) 9 6.7 Bending at ambient temperature 6.7.1 Object The object of this test is to ensure that the application of the marking has not caused mechanical damage to the insulation. 6.7.2 Apparatus See EN 3475-40
40、5, Clause 4. 6.7.3 Test specimen See 6.1.3 and EN 3475-405, Clause 3. 6.7.4 Procedure See EN 3475-405, 5.1. 6.7.5 Requirements See EN 3475-405, 5.2. 6.8 Voltage test 6.8.1 Object The specimen shall be tested to ensure that the application of the marking has not degraded the electrical performance of
41、 the insulation, sheath or jacket. 6.8.2 Apparatus See EN 3475-302, Clauses 3, 4 and 5. 6.8.3 Test specimen See 6.1.3 and EN 3475-302. 6.8.4 Procedure 6.8.4.1 Dry test as EN 3475-302, Clause 4. 6.8.4.2 Dry test (impulse) as EN 3475-302, Clause 5. 6.8.5 Requirements There shall be no perforation of the cable insulation, jacket or sheath and in the case of the impulse test the equipment shall not indicate a fault.
