1、STD.AECMA PREN 3745-50h-ENGL 2000 LOL23LL OL7hL5 Li40 Edition approved for publication 2000-01-31 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 8-1200 BRUXELLES prEN 3745-506 Edition P 1 January 2000 PUBLISHED BY
2、THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-I 200 BRUXELLES - Tel. (+32) 2 775 81 I O - Fax. (+32) 2 775 81 1 I ICs: 49.060 Descriptors: Aerospace industry, aircraft equipment, cable, fibre optic, optical fibres, test methods ENGLISH VERSION Aerospace series Fibres and
3、 cables, optical, aircraft use Test methods Part 506: Impact resistance Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 506: Rsistance limpact Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 506: Fallprfung This Merospace Series“ Pres
4、tandard has been drawn up under the responsibility of AECMA (The European Associafion of Aerospace Industries). It is published on green paper for the needs of AECMA- Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countri
5、es. Subsequent to the publication of this Presfandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. Affer examination and signafure of the AECMA Sfandard Checking Centre (NPS) and f
6、ormal agreement of the Oficial Services of the Member countries it will be submitted as a draff European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULIN
7、EAUX CEDEX C2 Chairman Mr Pezzetta I I aecma 2000 STD AECMA PHEN 375-5lh-ENGL 2000 E LnL2311i OOY7LLL 317 rage 3 prEN 3745-506: 2000 I Scope This standard specifies a method to determine the ability of an optical fibre or cable to withstand impact under specified environmental conditions. 2 Normativ
8、e references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
9、of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2591-1 O0 EN 3745-100 EN 3745-201 EN 3745-301 EN 187000 Aerospace series - Elements of electrical and opti
10、cal connection - Test methods - Part 100: General 1) Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 100: General 2) Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 201: Visual inspection 3) Aerospace series - Fibres and cables, opt
11、ical, aircraft use - Test methods - Part 301: Attenuation 3) Generic specification: Optical fibre cables - Method 505 - Impact 4) 3 Preparation of specimens 3.1 If not at standard test conditions, the specimens and test apparatus shall be subjected to standard test conditions and stabilised at these
12、 conditions for 24 h as defined in EN 3745-100. Attenuation shall be measured, in accordance with EN 3745-301, method C, before the test. 3.2 technical specification: Unless otherwise specified in the product standard, the following details shall be as stated in the - the temperature at which the te
13、st is to be carried out if other than standard; - the number and length of specimens; - the mass of the weight and the drop height, or alternatively the impact energy; - the radius R of the intermediate piece; - the number of impacts; - the permissible change in attenuation after the test. 1) In pre
14、paration at the date of publication of this standard. It will supersede EN 2591. 2) In preparation at the date of publication of this standard 3) Published as AECMA Prestandard at the date of publication of this standard 4) Published by CECC. 4 Apparatus The apparatus shall comprise: - a Light Launc
15、h System (LLS) and Light Detector System (LDS) as defined in EN 2591-100; - impact test apparatus as defined in EN 187000 method 505. The impact test apparatus shall permit a weight to drop vertically onto an intermediate piece of steel which transmits the impact to the cable sample. The sample shal
16、l be fixed to a flat substantial steel base. 5 Method 5.1 Procedure After the cable sample has been mounted in the test apparatus, the attenuation shall be measured as defined in EN 3745-301 method C. The mass of the weight and the height from which the weight falls shall be as specified, or if an i
17、mpact energy is specified shall be adjusted to give the value of impact energy shown. The number of impacts shall be as specified. The attenuation shall be measured immediately after the test as defined in EN 3745-301 method C. 5.2 Final measurements and requirements A visual examination shall be carried out as defined in EN 3745-201. The attenuation change shall be less than the specified value.
