1、AECMA PREN*3904 95 lsl iiOL23bl 0008556 001 Edition approved for publication 1995-04-28 AECMA STANDARD NORME AECMA AECMA NORM I I Comments should be sent within six months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-ks-Moulineaux Cedex - FRANCE prE
2、N 3904 Edition P April 1995 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 ICs : Descriptors : ENGLISH VERSION Aerospace series Washers, wire locking, in aluminium alloy, an
3、odized Srie arospatiale Pattes dancrage, en alliage daluminium, anodises Luft- und Raumfahrt Sicherungsbieche, aus Aluminiumlegierung, anodisiert This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). I
4、t is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee foiowing comment by the Member countries. Subsequent to the publication of this Prektandard, the technical content shall not be changed to an extent that
5、 interchangeability is affectedj;physicIly or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard t
6、o CEN (European Committee for Standardization) for formal vote. , I Nota - Extra copies can be supplied by B N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C3 Chairman M. Arena 0 aecma 1995 AECMA PREN*390Y 95 L0123LL 0008557 T48 e Page 3 prEN 3904 : 1995 1
7、 Scope .I .* This standard specifies the characteristics of wire locking washers, in aluminium alloy, anodized, for maximum operating temperature 120 OC, for aerospace applications. 2 Normative references EN 2000 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality
8、system of manufacturers EN 2090 Aerospace series - Aluminium alloy 2024-T3 - clad sheet and strip - 0,4 I a 2 6 mm EN 2091 Aerospace series - Aluminium alloy 2024-T4 - clad sheet and strip - 0,4 5 a 5 6 mm ) EN 2284 Aerospace series - Sulphuric acid anodizing of aiuminium and wrought aluminium alloy
9、s EN 2424 Aerospace series - Marking of aerospace products 3 Required characteristics 3.1 See figure 1 and table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. Configuration - Dimensions - Masses 3.2 Materials EN 2090 or EN 2091 3.3 Surface treatment EN
10、2284B ._. i 1 ) Published as AECMA Standard at the date of publication of this standard Previous page is blank AECIA PREN*3904 95 0 1OL23Ll 0008558 98Y O C L R Page 4 prEN 3904 : 1995 Mass Values in micrometres apply prior to surface treatment. 7 I I71 Diameter code Remove sharp edges 0,l to 0,2 B +
11、 0.2 O - +o2 ?k 0,25 3 5 0,25 0,25 ?I), 7 3 o, 1 , % I 030 1 3,2 4 4,5 1 040 1 4,3 8, 4 0,22 8,5 , 4,5 0,24 080 5,5 145 9,5 5,5,., I 0,31 Figure 1 7,5 8 11,5 73 0,49 12 8 0,54 93 10,5 13,5 9,5 0,61 14,5 10.5 0,68 1) Approximate values (kg/l O00 pieces), calculated on the basis of 2,8 kg/dm3, for inf
12、ormation purposes only ;5. AECMA PRENu3704 75 I I1012311 0008557 810 W 2 . Page 5 prEN 3904 : 1995 3 Y 4 Designation EXAMPLE : Description block Identity block WIRE LOCK WASHER EN 3 904-080 Number of this standard Diameter code (see table 1) NOTE : If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style G 6 Quality assurance EN 2000 ,
