1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-308:1998 Elements of electrical and optical connection Test methods Part 308: Sand and dust The European Standard EN 2591-308:1998 has the status of a British Standard ICS 49.060BSEN 2591-308:1998 This British Standard, having been prepared under the dire
2、ctionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes into effect on 15 August 1998 BSI 05-1999 ISBN 0 580 30302 0 National foreword This British Standard is the English language version of EN 2591-308:1998. The UK participation in its preparation was
3、 entrusted by Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, to Subcommittee ACE/6/3, Aerospace Connectors, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the in
4、terpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standar
5、ds which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard
6、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. Summary of pages This document comprises a front cover, an i
7、nside front cover, pages i and ii, theEN title page, pages 2 to 4 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 table on the inside front cover. Amendments issued since publication Amd. No. Date
8、 CommentsBSEN2591-308:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 2591-308 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-308 June 1998 ICS 49.060 Descriptors: Aircraft industry, aircraft equipment, connecting equipment, test Englis
9、h version Aerospace series Elements of electrical and optical connection Test methods Part 308: Sand and dust Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie 308: Sable et poussires Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 3
10、08: Sand und Staub This European Standard was approved by CEN on 22 June 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bib
11、liographical 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 (English, French, German). A version in any other language made by translation under the responsibility
12、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, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, N
13、orway, 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 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved
14、worldwide for CEN national Members. Ref. No. EN 2591-308:1998 EEN2591-308:1998 BSI 05-1999 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, this
15、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, at the
16、latest by December 1998, and conflicting national standards shall be withdrawn at the latest by December 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepu
17、blic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens 3 4 Apparatus 3 5 Method 3EN2591-308:1998 BSI
18、05-1999 3 1 Scope This standard specifies a method of assessing the ability of elements of connection to withstand the effects of driving fine sand and dust. It shall be used together with EN2591. 2 Normative references This European Standard incorporates by dated or undated reference provisions fro
19、m 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 European Standard only when incorporated in it by amendme
20、nt or revision. For undated references the latest edition of the publication referred to applies. EN 2591, Aerospace series Elements of electrical and optical connection Test methods General. EN 2591-408, Aerospace series Elements of electrical and optical connection Test methods Part 408: Mating an
21、d unmating forces 1) . 3 Preparation of specimens 3.1 Specimens shall be prepared according to the technical specification. 3.2 Unless specified in the technical specification, the following details shall be stated: number of mating and unmating operations before the test (if applicable); specimens
22、mated or unmated and fitted with protective cover (if applicable); mounting method and definition of specimen wiring; type of cable (if applicable); positions and orientation of specimens in the test chamber; initial measurements and requirements (ifapplicable); speed of airflow in jet; number of cy
23、cles; final measurements and requirements (ifapplicable). 4 Apparatus The test chamber shall be designed to: avoid turbulent flows ahead of the specimens and limit them as much as possible behind the specimens; favour uniform distribution of solid particles within the airflow. The climatic test cham
24、ber shall be provided with measurement and control devices for maintaining the following parameters within specified limits throughout the test: concentration of sand and dust mixture (opacity-measuring photoelectrical cell systems are recommended); speed of airflow in jet; relative humidity and tem
25、perature around the specimens. The sand and dust shall be abrasives with the following characteristics: 100% shall pass through a1504m mesh sieve; 98% shall pass through a1004m mesh sieve; 90% shall pass through a754m mesh sieve; 75% shall pass through a454m mesh sieve; The mixture shall contain bet
26、ween97% and99% in mass of SiO 2 . 5 Method 5.1 Initial measurements and requirements (ifapplicable) They shall be carried out as specified. The specimens shall be tested to EN2591-408. 5.2 Positions and orientation of the specimens in the test chamber They shall be placed in the specified positions
27、and orientation with respect to the airflow. 5.3 Procedure Each cycle shall last3h and consist of four phases, unless otherwise specified: Phase 1: within30min, the test chamber shall be stabilized within the following limits: temperature: (30 3)C; relative humidity: lower than30%; speed of airflow:
28、 between3m/s and10m/s. The recommended speed is (3,5 0,5)m/s; concentration of mixture: (6 3)g/m 3of air; Phase 2: the above conditions shall be maintained for1h. Phase 3: within30min, the temperature shall be brought to (65 5)C, the other parameters remaining unchanged. Phase 4: these conditions sh
29、all be maintained for1h. 1) Published as AECMA Prestandard at the date of publication of this standardEN2591-308:1998 4 BSI 05-1999 Unless otherwise specified, one cycle shall be carried out for each position. Between two successive cycles, the temperature shall be reduced to (30 3)C within2h maximu
30、m. 5.4 Recovery After the test and prior to any operation to prevent the effects of moisture, dust shall be removed from the specimens by shaking, wiping or brushing but no blower or suction devices shall be used to avoid dust ingress in the specimens. The specimens shall be allowed to recover as lo
31、ng as required for it to reach ambient temperature. 5.5 Final measurements and requirements (if applicable) Final measurements shall be made as specified. The specimens shall be tested to EN2591-408, recording the value of the first unmating.blankBS EN 2591-308:1998 BSI 389 Chiswick High Road London
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