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 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 speci
5、fications, drawings, company standards and public standards. It is estimated that references to public 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 i
6、ndependent standards documentation structure. This is a costly situation in terms of document and product 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 STANDARD
7、S instead of company standards means: For the PRIME CONTMCTOR REDUCED COSTS 0 Increased quantities - wider potential application 0 Increased competition between manufacturers 0 Shared qualification costs 0 Simplified managementupdating of documents SHORTER LEAD TIMES 0 Availability of product at man
8、ufacturers QUALITY 0 Requirements based on wider experience(s) 0 Technical control of common requirements 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 qualifica
9、tion. changes. 0 No direct control over - Drafting of the public standard: 0 longer timescale (consensus, approval cycle), layout and format. 0 subject to standard Page 6 prEN 4617:2004 REDUCTION OF DIVERSITY 0 Reduced qualification costs 0 Reduced document management costs 0 Lower value of stocks 0
10、 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 the requirements in the standard drafting stage. For the END USER 0 Product procurement defin
11、ed 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 (logistics and stock). 0 Wider tender base (reduction of procurement cost). 0 Loss of protected m
12、arkets (protectionism) 1) Statistical Process Control 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 requ
13、irements, 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. STANDARDI
14、SATION POLICY 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. Page 8 prEN 4617:2004
15、4 Approach for rationalising the requirements of company standards This approach may be followed for new, as well as for existing programs, for instance under the following circumstances: - intentional rationalisation, - integration of standard reference systems during company mergers, - obsolescenc
16、e of an existing definition (product withdrawal, etc.). NOTE etc.) in a public standard. A similar approach may 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
17、I I w STANDARD REFERENCE SYSTEM Figure 3 - Analysis of the standard reference system by domain O Internal prime contractor choice dependent upon lead times and/or specificities Page 9 prEN 4617:2004 IIIIVU IINITIBTIVE 5 From an individual initiative to a group approach GROUP APPROACH Standardisation
18、, 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 encouraging the rationalisation of requirements. This deliberate approach may be shared
19、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, expectations assessed, studies organised, results identified, and this by a simple ap
20、proach, 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, - a business sector, - a joint project SUBMiT8 THE REQUEST if necessary along with a
21、 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 body follows up on the request by defining the working structure and by organizing th
22、e 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 interested parties. This decision entails, de facto, the desire to apply the standard. AND O
23、ARDS 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 approached. Contact can be made through National bodies (see contact points in the Append
24、ix). 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 RE8 the application of the standard and evaluates the gains. Page 10 prEN 4617:2004 6 B
25、est practices - Perform 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 m
26、ore recent standards. 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,
27、 for example in the 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
28、 the model for public 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 t
29、he designer. - Develop 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 rationali
30、sation of specified requirements, - end users who are in a position to determine optimal characteristics of procurability, storage and use of the products concerned. Page 11 prEN 4617:2004 Annex A (informative) Terminology and contact points A.l Terminology standard (public) A document published by
31、a national, European or international standardisation body. It is published after favourable voting by the members of the 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. Compa
32、ny standard A document containing technical requirements published by an entity : company, group of companies, consortium, 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 Syste
33、m (SRS) identifies and records all standards applicable to a progamme or a company process. It comprises standards : - imposed by customers, - imposed by Aviation Authorities, laws and regulations bodies, - selected by the company, - chosen by subcontractors taking part in design and production of p
34、roducts and services. A.2 Contact points AECMA-STAN Gulledelle 94 B - 1200 Bruxelles - Belgique http:hww. aecma-stan. orq AENOR Asociacion Espanola de Normalizacion y Certificacion Gnova, 6 28004 Madrid - Espaa http:iiW.aenor.esd Page 12 prEN 4617:2004 BNAE Bureau de Normalisation de lAronautique et
35、 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 e.V. Zweigstelle Kln Kamekestrae 8 50672 Kln - Deutschland kttp:/w2.efirr.d
36、e 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
