1、BRITISH STANDARD AEROSPACE SERIESBS EN4617:2006Recommended practices for standardising company standardsThe European Standard EN 4617:2006 has the status of a British StandardICS 49.020g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55
2、g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 4617:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48718 0National forewordThis British Standard is the official
3、English language version of EN 4617:2006. The UK participation in its preparation was entrusted to Technical Committee ACE/1, International and European aerospace policy and processes, which has the responsibility to: A list of organizations represented on this committee can be obtained on request t
4、o its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electron
5、ic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to under
6、stand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a fr
7、ont cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 4617May 2006I
8、CS 49.020English VersionAerospace series - Recommended practices for standardisingcompany standardsSrie arospatiale - Normaliser les standards dentreprise Luft- und Raumfahrt - Harmonisierung von WerknormenThis European Standard was approved by CEN on 6 February 2006.CEN members are bound to comply
9、with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretar
10、iat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialve
11、rsions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Swede
12、n, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref.
13、No. EN 4617:2006: E2 Contents Page Foreword 3 Introduction4 1 Subject Purpose.5 2 The industrial challenges .6 3 Favourable conditions8 4 Approach for rationalising the requirements of company standards.9 5 From an individual initiative to a group approach .10 6 Best practices .11 Annex A (informati
14、ve) Terminology and contact points12 EN 4617:20063 Foreword This European Standard (EN 4617:2006) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Stan
15、dard 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, at the late
16、st by November 2006, and conflicting national standards shall be withdrawn at the latest by November 2006. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all
17、 such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irela
18、nd, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 4617:20064 Introduction Prime contractors You own and maintain a large number of company standards (normative type documents for
19、internal and external use) that are often ageing or redundant. Manufacturers You have to manage the company standards of your various customers and apply these in the best way possible in order to limit the diversity of your products. Whether you are a prime contractor or a manufacturer You would ag
20、ree that this situation is not suited to todays business environment. The streamlining of documents and practices by means of the rationalisation of individual company standards will help in meeting the efficiency targets of our industry. EN 4617:20065 1 Subject Purpose This document is a guide desc
21、ribing the recommended practices in specifying industrial requirements in the form of recognised standards (national, European, international), in preference to company standards. It emphasises the economic and industrial value of following and encouraging such practices. It is based on what is freq
22、uently observed and considered by primes and manufacturers as constituting best practices to the benefit of all involved in the life cycle of a product, from the design stage until its withdrawal from service. The purpose of this guide is to: encourage specification writers and designers to make gre
23、ater use of existing recognised standards and at the same time to reduce the use of company standards; 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
24、, through standards, requirements for which the audience is generally known; provide methodological support for the users of company standards when undertaking the rationalisation of various requirements. The achievement of this objective will be measured by: the reduction in the total volume of sta
25、ndards documentation, with an increase in the use of public standards as opposed to company standards, lower production costs arising from a reduction in product diversity. Figure 1 Harmonization Approach Public Standards Company standards Strategy _ New programmeExisting programme _ Economical inpu
26、t_ _ _ _ GUIDELINES Company standards Manufacturers OEM Nat.StdISOEN SDOEN 4617:20066 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 estimat
27、ed that references to public standards are few compared to references made to company standards (ratio of 1 to 10). 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
28、 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 STANDARDS instead of company standards means: For the PRIME CONTRACTOR + ADVANTAGES
29、 REDUCED COSTS Increased quantities wider potential application Increased competition between manufacturers Shared qualification costs Simplified management/updating of documents SHORTER LEAD TIMES Availability of product at manufacturers QUALITY Requirements based on wider experience(s) Technical c
30、ontrol of common requirements Simplified management of document system during company mergers or splits Definition of requirements: Possibility that they will not fully satisfy all requirements, including the qualification. No direct control over changes. Drafting of the public standard: longer time
31、scale (consensus, approval cycle), subject to standard layout and format. DISADVANTAGES EN 4617:20067 For the MANUFACTURER + ADVANTAGESREDUCTION OF DIVERSITY Reduced qualification costs Reduced document management costs Lower value of stocks Reduced manufacturing costs for large volumes Reduced lead
32、 times (Raw Mat. Supplies + production cycle) Less risk of non-conformity Better SPC 1) Wider potential market Possibility of influencing the requirements in the standard drafting stage. Loss of protected markets (protectionism) DISADVANTAGES For the END USER + ADVANTAGES Product procurement defined
33、 by Standard, including associated tooling Reduction of specific documentation. Enhanced implementation Confidence broad base for definition and process. Reduction in parts numbers to be managed (logistics and stock). Wider tender base (reduction of procurement cost). DISADVANTAGES1) Statistical Pro
34、cess Control EN 4617:20068 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, pursued. The definition of STANDARDISATION PO
35、LICY 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. Figure 2 Standard policy NOTE Beyond the permanent objectives as
36、sociated 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. STANDARDS AWARENESS REGULATORY / COOPERATION / PROGRAM / CONTRACTUAL CONSTRAINTS STANDARDISATION POLICY
37、STANDARD REFERENCE SYSTEM(STANDARDS HANDBOOK) ORGANIZATION OF THE COMPANY Research 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 sh
38、ared 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 simpl
39、e approach, summarised in the following analysis: INDIVIDUAL INITIATIVE GROUP APPROACH 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 NOTES
40、 - lack of a standard, or - a range of standards with many similarities in requirements EVALUATES THE BENEFIT to determine the potential gains both internally and in customer satisfaction in defining and implementing a public standard to replace company standards. DECIDES to initiate preparation of
41、a standard by rationalising the requirements of various interested parties. This decision entails, de facto, the desire to apply the standard. SUBMITS 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
42、 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 the studies. The applicant is informed of any results (including refusal) and is requested to take part in the stu
43、dies. AND FORWARDS the request for a standard study to the appropriate aerospace standardisation body given the subject and the expectations. The European (ASD-STAN, CEN) or International (ISO) level should be the first one approached. Contact can be made through National bodies (see contact points
44、in the Appendix). PROPOSES 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 PUBLICATION OF THE STANDARD MEASURES the application of the standard and evaluates the gains. EN 4617:2
45、00611 6 Best 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, w
46、ith more 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 circumstanc
47、es, 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 t
48、o 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
49、the 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 rationalisation of specified requirements, end users who are in a position to determine optimal characteristics of procurability, storage and use of the products concerned. EN 4617:200612 Anne
