AECMA PREN 4617-2004 Aerospace series Recommended practices for standardising company standards Edition P 1《航空航天系列.标准版操作规程建议.P1版》.pdf

1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 31 December 2004 prEN 4617 Edition P 1 December 2004 Comments should be sent within six months after the date of publication to Engineering Procedures Domain AECMA-STAN PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIE

2、S - STANDARDIZATION d%k? - increase the awareness among specification writers, designers, manufacturers and users of company standards of the value and importance of being part of a joint multilateral approach to formalising, through standards, requirements for which the audience is generally known;

3、 - provide methodological support for the users of company standards when undertaking the rationalisation of various requirements. The alehiewement of this objective will be measured by: - the reduction in the total volume of standards documentation, with an increase in the use of public standards a

4、s opposed to company standards, - lower production costs arising from a reduction in product diversity. Figure 1 - Harmonization Approach Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking perm

5、itted without license from IHS-,-,-Page 5 prEN 4617:2004 2 The industrial challenges 2.1 Current situation The characteristics of a product and the associated processes are largely defined by specifications, drawings, company standards and public standards. It is estimated that references to public

6、standards are few compared to references made to company standards (ratio of 1 to 1 O). Manufacturers have to deal with a substantial volume of company standards, with each company having its own independent standards documentation structure. This is a costly situation in terms of document and produ

7、ct management, and a source of confusion when faced with a multitude of requirements, often unjustified when the differences between the requirements are minor. 2.2 The future Using PUBLIC STANDARDS instead of company standards means: For the PRIME CONTMCTOR REDUCED COSTS 0 Increased quantities - wi

8、der potential application 0 Increased competition between manufacturers 0 Shared qualification costs 0 Simplified managementupdating of documents SHORTER LEAD TIMES 0 Availability of product at manufacturers QUALITY 0 Requirements based on wider experience(s) 0 Technical control of common requiremen

9、ts 0 Simplified management of document system during company mergers or splits - Definition of requirements: 0 Possibility that they will not fully satisfy all requirements, including the qualification. changes. 0 No direct control over - Drafting of the public standard: 0 longer timescale (consensu

10、s, approval cycle), layout and format. 0 subject to standard Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 6 prEN 4617:2004 REDUCTION OF DIVERSI

11、TY 0 Reduced qualification costs 0 Reduced document management costs 0 Lower value of stocks 0 Reduced manufacturing costs for large volumes 0 Reduced lead times (Raw Mat. Supplies + production cycle) 0 Less risk of non-conformity 0 Better SPC 1) 0 Wider potential market o Possibility of influencing

12、 the requirements in the standard drafting stage. For the END USER 0 Product procurement defined by Standard, including associated tooling 0 Reduction of specific documentation. 0 Enhanced implementation Confidence broad base for definition and process. 0 Reduction in parts numbers to be managed (lo

13、gistics and stock). 0 Wider tender base (reduction of procurement cost). 0 Loss of protected markets (protectionism) 1) Statistical Process Control Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or netwo

14、rking permitted without license from IHS-,-,-Page 7 prEN 4617:2004 3 Favourable conditions The reference to public standards or to company standards is a decision of the PRIME CONTRACTOR based upon: - industrial strategy, - the reference standards framework (system), - specific program requirements,

15、 pursued. The definition of STANDARDISATION POLICY and permanent upkeep of a STANDARD REFERENCE SYSTEM (standards handbook) are favourable conditions for encouraging the use of public standards taking into account the various program constraints and exercising STANDARDS AWARENESS. STANDARDISATION PO

16、LICY I Figure 2 - Standard policy NOTE Beyond the permanent objectives associated with the Company economics, the implementation and upkeep of a standard reference system is a major element of standardisation policy, especially in the case of industrial restructuring. Copyright Association Europeene

17、 des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 8 prEN 4617:2004 4 Approach for rationalising the requirements of company standards This approach may be followed for new, as wel

18、l as for existing programs, for instance under the following circumstances: - intentional rationalisation, - integration of standard reference systems during company mergers, - obsolescence of an existing definition (product withdrawal, etc.). NOTE etc.) in a public standard. A similar approach may

19、be undertaken in the expression of new requirements (new technology, product, ANALYSIS OF THE STANDARD REFERENCE SYSTEM BY DOMAIN I I I I I I I I I I PUB I I I I I I I I I I I I I I I I I I I w STANDARD REFERENCE SYSTEM Figure 3 - Analysis of the standard reference system by domain O Internal prime

20、contractor choice dependent upon lead times and/or specificities Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 9 prEN 4617:2004 IIIIVU IINITIBTI

21、VE 5 From an individual initiative to a group approach GROUP APPROACH Standardisation, just like quality, is not the exclusive property of a group of specialists; it is everybodys business. Everyone has, in addition to a responsibility for the correct application of standards, the possibility of enc

22、ouraging the rationalisation of requirements. This deliberate approach may be shared between persons within an existing structure (company, inter- group, standards organization, etc.) or initiated by a person outside the standardisation process. In any case, the statement of need must be confirmed,

23、expectations assessed, studies organised, results identified, and this by a simple approach, summarised in the following analysis: A person (design, production, quality, purchasing, .) A group of people involved in the same operation or series of operations within: - a company or group of companies,

24、 - a business sector, - a joint project SUBMiT8 THE REQUEST if necessary along with a proposal, to the national body in charge of aerospace standardisation. This body can forward the request to the relevant international body for the subject (see contact points in the Appendix). The standardisation

25、body follows up on the request by defining the working structure and by organizing the studies. The applicant is informed of any results (including refusal) and is requested to take part in the studies. DEcmES to initiate preparation of a standard by rationalising the requirements of various interes

26、ted parties. This decision entails, de facto, the desire to apply the standard. AND OARDS the request for a standard study to the appropriate aerospace standardisation body given the subject and the expectations. The European (AECMA-STAN, CEN) or International (SO) level should be the first one appr

27、oached. Contact can be made through National bodies (see contact points in the Appendix). PROPOSE8 a draft drawn up in accordance with the rules of the standardisation body concerned, at least one qualified person to participate actively in the body study group. AFTER UIATO OF THE STANDARD M EASU RE

28、8 the application of the standard and evaluates the gains. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 10 prEN 4617:2004 6 Best practices - Pe

29、rform regular reviews of the standard reference system and whenever new programs are launched, to take into account new and obsolete standards. - Review the requirements specified in the company standards in order to bring them into line (harmonise these), wherever possible, with more recent standar

30、ds. Should the revision of a company standard become necessary, the procedure described in the chart page 6 should be used. - State the requirements in terms of results. The statement of both means and results as requirements may be provisionally justified in certain circumstances, for example in th

31、e case of transfer of technology. The continued application however, of such a practice often leads to cost increase. - In the event of recourse to a company standard, this must refer to the public standard and state any particular requirements. Company standards must be drafted to the model for pub

32、lic standards. Avoid copying blocks of text from standards, or referring to a specific revision of the standard. This practice obviously calls for a degree of standards awareness in order to ensure that any changes to the standard referred to do not conflict with the intention of the designer. - Dev

33、elop a deliberate and proactive attitude extending to: - manufacturers who must make prime contractors aware of any observations they may have due to their unique position as a crossroads for differing requirements, - prime contractors who can assess opportunities for the rationalisation of specifie

34、d requirements, - end users who are in a position to determine optimal characteristics of procurability, storage and use of the products concerned. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or netwo

35、rking permitted without license from IHS-,-,-Page 11 prEN 4617:2004 Annex A (informative) Terminology and contact points A.l Terminology standard (public) A document published by a national, European or international standardisation body. It is published after favourable voting by the members of the

36、 standardisation body. Modifications to this document are also subject to an evaluation and voting procedure. In general, the copyright is owned by the standardisation body. Company standard A document containing technical requirements published by an entity : company, group of companies, consortium

37、, program standard. The conditions of approval, revision and the rights of use and reproduction are defined by that entity. Standard Reference System The Standards Reference System (SRS) identifies and records all standards applicable to a progamme or a company process. It comprises standards : - im

38、posed by customers, - imposed by Aviation Authorities, laws and regulations bodies, - selected by the company, - chosen by subcontractors taking part in design and production of products and services. A.2 Contact points AECMA-STAN Gulledelle 94 B - 1200 Bruxelles - Belgique http:hww. aecma-stan. orq

39、 AENOR Asociacion Espanola de Normalizacion y Certificacion Gnova, 6 28004 Madrid - Espaa http:iiW.aenor.esd Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IH

40、S-,-,-Page 12 prEN 4617:2004 BNAE Bureau de Normalisation de lAronautique et de lEspace Technopolis 54 199 rue Jean-Jacques Rousseau 92138 Issy Les Moulineaux Cedex - France BSI British Standards Institution 389 Chiswick High Road London - W4 4AL - United Kingdom DIN-NL Deutsches Institut fr Normung

41、 e.V. Zweigstelle Kln Kamekestrae 8 50672 Kln - Deutschland kttp:/w2.efirr.de IBN Institut belge de normalisation Av. de la Brabanonne 29 BE-I000 Bruxelles - Belgique http:j/www. ibn. be SIS Swedish Standards Institute Sankt Paulsgatan 6 SE-I 18 80 - Sweden http:jjw.sis.se UNI Ente Nazionale Italiano di Unificazione Via Battistotti Sassi 1 l/b IT-20133 Milano - Italia http:i/w6Y.Uni.Com Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-