1、BRITISH STANDARD AEROSPACE SERIES BS EN 2601:1996 Fork ends, adjustable Technical specification The European Standard EN 2601:1996 has the status of a British Standard ICS 49.040.30BS EN 2601:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was pu
2、blished under the authority of the Standards Board and comes into effect on 15 December 1996 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment 90/73742 DC ISBN 0 580 26347 9 Committees responsible for this British Standard The
3、preparation of this British Standard was entrusted to Technical Committee ACE/14, Aerospace details and parts, upon which the following bodies were represented: British Iron and Steel Producers Association Civil Aviation Authority (Airworthiness Division) Federation of Wire Rope Manufacturers of Gre
4、at Britain Institute of Petroleum Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBS EN 2601:1996 BSI 11-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative reference
5、s 3 3 Definitions 3 4 Required characteristics, inspection and test methods 3 5 Quality assurance 6 6 Packaging 6 7 Certificate of conformity 7 Figure 1 Discontinuities on crest of thread 5 Figure 2 Discontinuities on thread flank 6 Table 1 Untitled 4 Table 2 Non-destructive inspections and tests to
6、 be carried out for qualification 7 Table 3 Destructive inspections and tests to be carried out for qualification 7 Table 4 Inspections and tests to be carried out for acceptance 7 List of references Inside back coverBS EN 2601:1996 ii BSI 11-1998 National foreword This British Standard has been pre
7、pared by Technical Committee ACE/14 and is the English language version of EN 2601:1996 Aerospace series Fork ends, adjustable Technical specification, published by the European Committee for Standardization (CEN). EN 2601:1996 was produced as a result of international discussions in which the Unite
8、d Kingdom took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-refe
9、rences Publication referred to Corresponding British Standard BS 6293 Aerospace. MJ threads ISO 5855-1:1988 Part 1:1994 General requirements ISO 5855-2:1988 Part 2:1994 Limit dimensions for bolts and nuts EN 3042:1991 BS EN 3042:1992 Quality assurance. EN aerospace products. Qualification procedure
10、Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment
11、table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2601 July 1996 ICS 49.040.30 Descriptors: Aircraft, industry, aircraft control, rod fork-end, threaded shank, specification English version Aerospace series Fork ends, adjustable Technicalspecification Srie arospatia
12、le Embouts rglables chape Spcification technique Luft und Raumfahrt Einstellbare Gabelkpfe Technische Lieferbedingungen This European Standard was approved by CEN on 1995-12-27. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this E
13、uropean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (Engl
14、ish, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, F
15、inland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050
16、 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 2601:1996 EEN 2601:1996 BSI 11-1998 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association,
17、 this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, a
18、t the latest by January 1997, and conflicting national standards shall be withdrawn at the latest by January 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denma
19、rk, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN 2601:1996 BSI 11-1998 3 1 Scope This standard specifies the required characteristics, inspection and test methods, qualification and acceptan
20、ce conditions for single or double adjustable fork ends with threaded shank used with flight control rods. It is applicable whenever referenced. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are
21、 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 European Standard only when incorporated in it by amendment or revision. For undated references the latest ed
22、ition of the publication referred to applies. ISO 5855-1, Aerospace MJ threads Part1:General requirements. ISO 5855-2, Aerospace MJ threads Part2:Limit dimensions for bolts and nuts. EN 2002-16, Aerospace series Test methods for metallic materials Part 16: Dye penetrant testing 1) . EN 3042, Aerospa
23、ce series Quality assurance EN aerospace products Qualification procedure. 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 Surface discontinuities 3.1.1 crack break in the material which may extend in all directions and be intercrystalline or transcrystalline in
24、 character 3.1.2 score, scratch open surface defect 3.1.3 lap surface defect where particles of metal or sharp edges are folded over and then rolled or forged into the surface 3.1.4 seam unwelded fold which appears as an open defect in the material 3.2 production batch batch consisting of fork ends
25、of the same type, the same dimensions and the same material batch, defined by the same dimensional standard 3.3 delivery batch batch consisting of fork ends with the same identity block which may come from different production batches 4 Required characteristics, inspection and test methods See Table
26、 1. 1) In preparation at the date of publication of the present standardEN 2601:1996 4 BSI 11-1998 Table 1 Sub- clause Characteristics Requirements Inspection and test methods Q a A b 4.1 Materials In accordance with product standards or design documentation Chemical analysis or certificate of confo
27、rmity issued by semi-finished product manufacturer X X 4.2 Dimensions and tolerances In accordance with product standards or design documentation Suitable measuring instruments X X 4.3 Masses In accordance with product standards or design documentation Suitable methods X X 4.4 Marking In accordance
28、with product standards or design documentation. It shall be legible and shall not adversely affect the material or the functioning of the fork end Visual examination X X 4.5 Surface appearance (except thread) No surface discontinuity c Suitable inspection methods X X Look for seams and cracks by dye
29、 penetrant process according to EN2002-16 or magnetic process. 4.6 Longitudinal and circumferential grooves Shall not change the thread function Visual examination and threaded gauge X X 4.7 Surface roughness In accordance with product standards or design documentation Suitable measuring instruments
30、 or visual-tactile samples X X 4.8 Surface treatment In accordance with product standards or design documentation Visual examination3 Aspersurfacetreatment standard X X (continued)EN 2601:1996 BSI 11-1998 5 Table 1 Sub- clause Characteristics Requirements Inspection and test methods Q a A b 4.9 Thre
31、ad discontinuities See Figure 1 and Figure 2. c Examination of micrographic section for: qualification: on finished parts. X acceptance: by sampling during manufacture X 4.10 Tensile ultimate static load There shall be no failure at the ultimate static load given in the product standards or design d
32、ocumentation. Mount the fork end on a tensile device as far as the circular safety groove. X Apply a basic load equal to 10 % of the ultimate static load. Increase the load progressively (10MPa/s) up to the ultimate static load. Visual examination a Q = Qualification test b A = Acceptance test c The
33、se inspections shall be made in the absence of surface treatment which, for purposes of qualification, may be removed by a chemical process. Figure 1 Discontinuities on crest of threadEN 2601:1996 6 BSI 11-1998 5 Quality assurance 5.1 Product qualification See EN 3042 and Tables 2 and 3. However, qu
34、alification of a fork end is acquired if it has been obtained, for the fork end immediately before and the one immediately after the fork end in question, within the range of fork ends indicated in the product standard. 5.2 Acceptance conditions 5.2.1 Inspections and tests to be carried out by the m
35、anufacturer The acceptance of a delivery batch shall be in accordance with Table 4. 5.2.2 Users quality control The user may, on acceptance of a delivery batch, proceed to inspect it by using the inspections specified in Table 4, in full or in part, to ensure that the items conform to the required q
36、uality level and to determine whether the delivery batch is acceptable. This inspection can be carried out in the users factory, or, by special agreement, in the manufacturers factory. 6 Packaging The fork ends shall be packaged individually or collectively so that they will not be damaged during tr
37、ansportation. They shall be protected against moisture, corrosion, dirt and other harmful substance. The packaging material in contact with the fork end shall provide this protection. The following indications shall be affixed to each individual package: manufacturers name and address; identity bloc
38、k as defined by product standards or design documentation; packaging date. The following indications at least shall appear on collective packaging: manufacturers name and address; number of order; quantity; identity block(s) as defined by product standards or design documentation. Figure 2 Discontin
39、uities on thread flankEN 2601:1996 BSI 11-1998 7 7 Certificate of conformity All the fork ends supplied in accordance with this standard shall be accompanied by a certificate of conformity from the manufacturer. Table 2 Non-destructive inspections and tests to be carried out for qualification Table
40、4 Destructive inspections and tests to be carried out for qualification Table 4 Inspections and tests to be carried out for acceptance Type of inspections and tests a Defined in subclause Serial number of samples 1 b 2 b 3 4 5 Materials 4.1 X X X X X Dimensions and tolerances 4.2 X X X Masses 4.3 X
41、X X Marking 4.4 X X X X X Surface appearance 4.5 X X Longitudinal and circumferential grooves 4.6 X X X Surface roughness 4.7 X X Surface treatment 4.8 X X X a The order is left to the initiative of the qualification authority. b Samples without surface treatment Types of inspections and tests a Def
42、ined in subclause Serial number of samples 1 b 2 b 3 b 4 5 Thread discontinuities 4.9 X X X Tensile ultimate static load 4.10 X X a The order is left to the initiative of the qualification authority. b Samples without surface treatment Type of inspections and tests a Defined in subclause Sampling pl
43、an bc Materials 4.1 Certificate of conformity of semi-finished products manufacturer Dimensions and tolerances 4.2 Tolerance 0,2 mm : 10 % oreightpartsmin. Tolerances0,2mm:100 % Masses 4.3 Three parts Marking 4.4 100 % Surface appearance 4.5 100 % Longitudinal and circumferential grooves 4.6 100 % S
44、urface roughness 4.7 5 % or four parts min. Surface treatment 4.8 5 % or four parts min. Thread discontinuities 4.9 1 % or one part min. a The order is left to the initiative of the acceptance authority. These inspections can be carried out at the time of manufacture. b For the manufacturer: When th
45、e sampling is not 100 %, any defect found in the course of an inspection or test requires this inspection to be extended to 100 %. c May vary with the approval of the user or authority responsible for acceptance.8 blankBS EN 2601:1996 BSI 11-1998 List of references See national foreword.BSI 389 Chis
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