1、BRITISH STANDARD AEROSPACE SERIES BS3G 100-2.3.7:1972 Specification for General requirements for equipment in aircraft Part 2: All equipment Section 3: Environmental conditions Subsection 3.7: Tropical exposure UDC629.7.05/.06:620.193.23.001.4BS3G100-2.3.7:1972 ThisBritishStandard, having been appro
2、ved by the Aerospaceindustry StandardsCommittee, was published under the authorityofthe Executive Boardof the Institution on 14 June 1972 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/58 Draft for comment 71/30577 ISBN 0 580 07223 1 Foreword Th
3、is British Standard is part of a composite standard in the Aerospace Series of British Standards that specifies general requirements for equipment in aircraft. An introduction to the complete British Standard is given in BS3G100-0. This subsection of BS 3G100 supersedes Clause 208 b) in BS 2G100-2:1
4、962, and details a test for tropical exposure. It is republished with minimal requirement changes pending a complete revision when full international agreement has been reached by the International Electrotechnical Commission (IEC) Technical Committee TC 50 and the International Organization for Sta
5、ndardization (ISO) Technical Committee TC 20 in relation to standard methods of test for tropical exposure to ensure reproducibility of test results. This standard makes reference to the following British Standards: BS3G100, General requirements for equipment in aircraft Part 0: Introduction Part 2:
6、 All equipment Section 3: Environmental conditions Subsection 3.0: Standard test requirements Subsection 3.2: Temperature-pressure requirements. NOTEInformation concerning metric (SI) units is given in BS 3763, “The International System of units (SI)”, and BS 350, “Conversion factors and tables”. A
7、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. Summary of pages This document comprises a
8、front cover, an inside front cover, pages i and ii, page 1 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 Commen
9、tsBS3G100-2.3.7:1972 BSI 12-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 General test requirements 1 3 Test 1ii blankBS3G100-2.3.7:1972 BSI 12-1999 1 1 Scope This British Standard specifies a test to determine the suitability of equipment to be installed in aircraft that will be expo
10、sed to a humid environment typical of the tropically wet areas of the world. It should also be read in conjunction with BS3G100-0. 2 General test requirements The general test requirements stated in BS3G 100-2.3.0 shall apply. 3 Test 3.1 General. Equipment that has previously been subjected to the a
11、ppropriate temperature-pressure tests stated in BS3G 100-2.3.2 shall be subjected to the following test. The relevant equipment specification may permit the use of a separate sample. 3.2 Test procedure. The equipment in its idle state shall be subjected to cyclically varying temperatures ranging fro
12、m 35 1 C to 20 5 C while the relative humidity is maintained at not less than 95% throughout the entire test. Each cycle shall last 24 h, consisting of the attainment and maintenance of the upper temperature for 12 h and the lower temperature for not less than 5 h. This cycle shall be repeated for 2
13、8 days or for such longer period as may be specified in the relevant equipment specification. At the completion of the test, after regaining room temperature, the equipment shall be visually examined to determine whether deterioration likely to impair performance has occurred. The relevant equipment
14、 specification shall state the required performance tests and any special recovery conditions permitted.BS3G 100-2.3.7:1972 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view
15、 on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the q
16、uality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. B
17、SI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:020
18、89967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international
19、standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to d
20、ate with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in th
21、e UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without
22、prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
