1、- STD-AECMA PREN 3795-508-ENGL L77b W LDLZ3LL OUI2272 Tbb Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of pubkation to C2 Chairman prEN 3745-508 Edition P 2 April 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPAC
2、E INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 Supersedes issue P1 ICs : 49.060 October 1996 Descriptors : Aircraft industry, aircraft equipment, connecting equipment, test ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft us
3、e Test methods Part 508 : Torsion Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 508 : Torsion Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 508 : Torsion This “Aerospace Series“ Prestandard has been drawn up under the responsibili
4、ty of AECMA (The European Association 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 countries. Subsequent to the publication of this Prestan
5、dard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre INPSI and formal agreement of the Official Services of the M
6、ember countries it will be submitted as a draft 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 - 921 38 ISCY-LEC-MOULINEAUX CEDEX 1997-04-30 AECMA Gulledelle 94 B-120
7、0 BRUXELLES Mr Pezzetta I I aecma 199 STD-AECMA PREN 3745-508-ENGL 3796 1012311 O032273 9T2 i Page 3 prEN 3745-508 : 1997 I Scope This standard specifies a method of checking the resistance to damage under torsion of an optical cable for aerospace applications. 2 Normatives references This European
8、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 of these publications apply
9、 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 Aerospace series - Elements of electrical and optical connection - Test methods - General 1 EN 3745-100 Aerospace series - Fibre
10、s and cables, optical, aircraft use - Test methods - Part 100 : General 2) EN 3745-201 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 201 : Visuai examination 2) EN 3745-301 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 301 : Att
11、enuation 2, EN 3745-505 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Patt 505 : Tensile strength 2, 3 Preparation of specimens 3.1 Launch System (LLS) and Light Detection System (LDS) as defined in EN 2591. The specimens shall be terminated with a connecting system al
12、lowing connection to the Light If not yet at standard test conditions, the specimens shall be subjected to standard test conditions and stabilized at these conditions for 24 h as defined in EN 3745-100. 3.2 Unless specified in the technical specification, the following details shall be stated : - ty
13、pe and length of cable; - number of cycles if not 100; - load to be applied; - maximum permissible variation of attenuation; - maximum value of insertion loss; - minimum value of the pulling test of the specimen at the end of the torsion test; - distance (L) between the rotating grip and the fixed g
14、rip. 1) At the date of publication of this standard, general aspects of elements of optical connection are covered by a draft amendment which is in preparation to the European Standard EN 2591. 2) In preparation at the date of publication of this standard Previous page is blank Page 4 prEN 3745-508
15、: 1997 4 Apparatus The apparatus shall comprise : - a Light Launch System (LLS) as defined in EN 2591; - a Light Detection System (LDS) as defined in EN 2591; I l - a test setup capable of applying the torsion load required by the test specification. A typical arrangement is shown in figure I. I Rot
16、ation of the cable I One cycle f 360“ 1 Specimen 1 Moving support Weight Figure 1 5 Method 5.1 Procedure - Install the cable in the test equipment, at a zero angle of torsion. - Connect the specimen to LLS and LDS. - Zero the LDS. Unless otherwise stated in the product standard, the following test s
17、hall apply : - the cable shall be rotated first 360 in one direction then at 720 in the opposite direction. It shall then be returned to the starting position (360O in the first direction). This defines one cycle; - the number of cycles shall be 100; - the cyclic rate shall be 6 cycles/min. The attenuation (EN 3745-301, method C) shall be monitored throughout the test. 5.2 Final measurements and requirements - EN 3745-201 - EN 3745-505
