1、IS1 2M*50 86 ltb2i1bb9 0100819 7 = British Standard IS0 1464-1985 2M 50: 1986 UDC 629.7 : 621 366- 181 0 British Standards Institution. No part of this publication may be photocopied or otherwise reproduced without the prior permission in writing of BSI British Standard Aerospace Series : Specificat
2、ion for Clearance dimensions for tripod jacks for aircraft Srie arospatiale. Dimensions dencombrement des vrins de levage tripods pour aronefs - Spcifications Luft- und Raumfahrt-Reihe. Abstandmae fr Dreifu-Gerstschrauben unter Flugzeugen 0 Contents National foreword Committees responsible Specifica
3、tion 1 Scope and field of application 2 Reference 3 Requirements Page Back Over Front cover Table Values of apex circle diameter Figures 1 Untitled 2 Untitled 3 Untitled Page 2 3 4 5 National foreword This revision of this British Standard has been prepared under the direction of the Aerospace Stand
4、ards Committee. It is identical with IS0 1464-1985 Aircraft - Clearance dimensions for tripod jacks, published by the International Organization for Standardization (ISO), and supersedes British Standard M 50 : 1980, which is withdrawn. It now includes the values of apex circle diameter for three ca
5、pacities of aircraft jacks whose equilateral triangular base and limiting edges are now 30“ to the vertical axis. Terminology and conventions. The text of the international standard has been approved as suitable for publication, without deviation, as a British Standard, Some terminology and certain
6、conventions are not identical with those used in British Standards; attention is drawn especially to the following, The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words International Sta
7、ndard appear, referring to this standard, they should be read as British Standard. Cross-references International standard Corresponding British Standard IS0 43-1976 British Standard 2C 12 : 1980 Specification for jacking pads for aircraft (Identical) British Standards Institution British Standard 2
8、M 50 : 1986 1 Scope and field of application This International Standard specifies the minimum clear space to be provided beneath the aircraft main jacking points, in order to accommodate tripod jacks and thus ensure adequate clearance between the jacks and the adjacent aircraft structure. This Inte
9、rnational Standard is not intended to define fuliy all jack clearance dimensions. In situations where clearances are critical, it should be used as a design aid only. Final critical clearances should be established by using actual jack dimen- sions. 2 Reference IS0 43, Aircraft - Jacking pads. 3 Req
10、uirements The minimum clear space to be provided under aircraft main jacking points, to accommodate tripod jacks, shall be in the form of a truncated right pyramid having an equilateral triangular base and limiting edges at 30 to the vertical axis. The height of the pyramid shall be sufficient to re
11、ach the airplane jacking pad at the maximum airplane height before jacking. The dimensions of the truncated top of the pyramid shall be such as to meet the dimensions of the inscribed circle given in the table. In addition, in order to ensure adequate jack stability, the base of the pyramid shall ha
12、ve a minimum leg radius from the vertical centreline of 0,3 times the maximum ex- tended jack height. In applications where the jacking pad is embedded within the surface of the airplane, this pyramid shall have an additional clear space in the shape of a cylinder on top of the pyramid and on the ve
13、rtical centreline of the pyramid. This cylinder shall be such as to meet the space requirements of the appropriate main jacking pad configuration specified in IS0 43. The above requirements are illustrated in figures 1, 2 and 3. Table - Values of apex circle diameter Jack capacity Diameter of apex c
14、ircle kN (Ibf) mm (in) Less than 44.5 (10 000) 152,4 (6) 44.5 to less than 500 (10 O00 to 112 o001 228.6 (9i I 1500to1 112(112000to250000) I 34,8 (12) 2 British Standard 2M 50 : 1986 Floor level -/ Side view Diameter of circle from table to establish dimension of top of pyramid 1 Plan view Figure 1
15、3 BSI 2M*50 b PI 3b246b 0300822 7 ! British Standard 2M 50: 1986 a Floor level 1 jack height 4 C Figure 2 4 British Standard 2M 50 : 1986 lr Clearance cylinder Floor level Side view Plan view Figure 3 5 A - BSI 2M*50 Bb I1624669 0300824 O I . %? Amd. No. This British Standard, having been prepared u
16、nder the direction of the Aerospace Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 July 1986. O British Standards Institution, 1986 ISBN O 580 15096 8 British Standards Institution Incorporated by Royal Charter, BSI is the independent national
17、body for the preparation of British Standards. It is the UK member of the International Organization for Standardization and UK sponsor of the British National Committee of the International Electrotechnical Commission. Copyright Users of British Standards are reminded that copyright subsists in all
18、 BSI publications. No part of this publication may be reproduced in any form without the prior permission in writing of 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. Enquiries should be
19、 addressed to the Publications Manager, British Standards Institution, Linford Wood, Date of issue Text affected Acnir P O rn British Standard 2M 50 : 1986 IS0 1464-1985 Milton Keynes MK14 6LE. The number for telephone enquiries is 0908 320033 and for telex 825777. Contract requirements A British St
20、andard does not purport to include ali the necessary provisions of a contract, Users of British Standards are responsible for their correct application. Revision of British Standards British Standards are revised, when necessary, by the issue either of amendments or of revised editions. It is import
21、ant that users of British Standards should ascertain that they are in possession of the latest amendments or editions. Information on all BSI publications is in the BSI Catalogue, supplemented each month by ES1 News which is available to subscribing members of the Institution and gives details of ne
22、w publications, revisions, amendments and withdrawn standards. Any person who, when making use of a British Standard, encounters an inaccuracy or ambiguity, is requested to notify BSI without delay in order that the matter may be investigated and appropriate action taken. The following BSI reference
23、s relate to the work on this standard: Committee reference ACE/57 Draft for comment 84/70112 DC Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Committee (ACE/-) to Technical Committee ACE/57, upon which the following
24、 bodies were represented: Association of Webbing Load Restraint Equipment Manufacturers British Airways British Caledonian Airways British Narrow Fabrics Association Civil Aviation Authority (Airworthiness Division) Ministry of Defence Society of British Aerospace Companies Ltd. I I cn British Standards Institution - 2 Park Street London WIA 2BS . Telephone 01-629 9000 - Telex 266933 . 8607 -4-1.3k- ACE157
