1、STC-AECMk PREN qYZCi-ENGL 1778 LOL23Ll 0014352 933 AECMA STANDARD NORME AECMA AECMA NORM prEN 4425 Edition P 1 February 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: Descriptors: ENGL
2、ISH VERSION Aerospace series Washers, tab in corrosion resisting steel for flight control rods Dimensions Srie arospatiale Freins dcrous en acier rsistant la corrosion pour bielles de commandes de vol Dimensions Luft- und Raumfahrt Sicherungsbleche aus korrosionsbestndigern Stahl, fr Bediengestnge v
3、on Flugsteuerungen Mae This “Aerospace Series“ Prestandard has been drawn up under the responsibility 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
4、 Committee following comment by the Member countries. 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 standard. After examination and signature
5、 of the AECMA Standard Checking Centre (NPSI and formal agreement of the Official Services of the Member 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,
6、rue Jean-Jacques Rousseau - 921 38 ICSY-LES-MOULINEAUX CEDEX I I l Comments should be sent within six months after the date of publication to I Edition approved for publication 1998-02-27 AECMA Gulledelle 94 B-1200 BRUXELLES I C1 Chairman Mr streicher 0 aecma 1998 STD.AECMA PREN 4Li25-ENGL 1998 LOL2
7、3LL 0014353 67T Page 3 prEN 4425 4 1 Scope This standard specifies the characteristics of tab washers for flight control rods. These tab washers are intended to immobilise the rod end in relation to the rod body, whilst allowing a positional adjustment. 2 Normative references This European Standard
8、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 to this
9、 Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 2000 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufac- turers EN 3488 Aerospace series - Stee
10、l FE-PA13 - softened 500 I R, I 750 MPa - sheet and strip - 0,5 I a I 6 mm) 3 Required characteristics 3.1 Dimensions - Mass Configuration shall correspond with figure 1. The dimensions and masses shall conform with values quoted in table 1. 3.2 Surface roughness Ra = 3.2 pm. 3.3 Material According
11、to EN 3488 ) Published as AECMA Pre-Standard at the date of publication of the present standard Previous page is blank H2LK (v2.FA) STD.RECMA PREN WE,-ENGL rn LOLZ, ILWY XIL m Page 4 prEN 4425 Diameter code 08 10 12 14 16 A-A Mass 4 a, 1, 12 4 rl r2 f-3 r4 g 1 ,o 1 ,o 1,s 10,2 18 8 10 16 13 13 12.2
12、21 9 11 19 16 290 14,2 24 10 21 17 2.4 16,2 26 11 24 19 4 2,7 I 4.5 4 82 16 1,8 +o, 1 d.25 10.25 4,25 0.25 10,5 *0,25 &,25 4.5 O O 6 8 14 10,5 0,6 I 23 0,8 192 3 12 X B-B Y 1) Optional radius 2) Identification mark Figure 1 Table 1 Dimensions in millimetres H2LK (U2.FR) L I 4 Designation Each tab wa
13、sher shall only be designated as in the following example: EXAMPLE: Description block WASHER TAB Page 5 prEN 4425 Identity block EN 442543 I Number of EN standard Diameter code (see table 1) NOTE: If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Ma
14、rking In addition to the manufacturets own marking, each tab washer and its packaging shall be marked, using the identity block as defined in clause 4 of this standard. The marking position and method are at the manufacturers option. The marking, when it is possible, shall be indelible and shall not impair the characteristics of the tab washer. I 6 Qualification According to EN 2000.
