1、n BSI 2M*4l 77 m Lb24bb 0100740 5 m 2M 41 : 1977 ISO482-1977 (Superseding British Standard M 4 11 UDC 629.7.03 : 003.63 : 003.35 l British Standard Aerospace Series : Methods of Numbering propulsion units and components and describing their direction of rotation IS0 title: Aircraft - Propulsion unit
2、s and components - Methods of numbering and describing direction of rotation Srie arospatiale: Mthodes de numrotage des lments de propulsion et composants et dfinition de leur sens de rotation Luftraumserie: Verfahren zur Bezifferung von Triebwerkeinheiten und Bauteilen und zur Beschreibung der Dreh
3、richtung Foreword This British Standard has been prepared under the direction of the Aerospace Standards Committee and is ideniical with IS0 482 - 1977 Aircraft - Propulsion units and components - Methods of numbering and describing direction of . rotation, prepared by Technical Committee iSO/TC 20,
4、 Aircraft and space vehicles, of the International Organization for Standardization. It is also a revision of British Standard M 41. The principal change made during the revision is the inclusion of the method of numbering vertical thrust engines which are in groups having single controls. Terminolo
5、gy. The text of the international standard has been accepted as suitable for publication, without deviation, as a British Standard. Certain terminology is used, however, that is not identical with that used in British Standards. Attention is therefore drawn to the following. Wherever the words Inter
6、national Standard, relating to this publication, appear, they should be interpreted as British Standard. British Standards Institution Gr 3 2M 41 : 1977 1 SCOPE AND FIELD OF APPLICATION correspond to that in which the axis of each engine is encountered by a plane parallel to the plane of symmetry Th
7、is International Standard specifies the methods of of the aircraft and moving from port to starboard. When numbering aircraft engines, engine cylinders and Cmbus- this plane simultaneously meets the axes of several engines, tion chambers, on drawings, for example, and the methods they shall be numbe
8、red from front to rear or from bottom rotors and of propellers. shall bear the same number. Of describing the direction of rotation of main shafts and to top, as appropriate. N two engines in a given airframe 2.2 Horizontal thrust engines (see figure 1 ) Horizontal thrust engines, including those wh
9、ich also have a vertical thrust capability (.e. dual-purpose engines) shall be numbered 1, 2, 3, etc., in accordance with the principle in 2.1, the numbers of the dual-purpose engines being based on their relative positions in cruising flight. 2 NUMBERING OF ENGINES 2.1 Principle The numbering of en
10、gines shall be according to the engine location in the airframe, in that the numbering order shall - FIGURE 1 - Numbering of horizontal thrust engines 2 BSI 2M*4L 77 = Lb24bb 0300742 9 UJ 2M 41 : 1977 1 2 4A 40 O0 b) f 34 FIGURE 2 - Numbering of vertical thrust engines 2.3 Vertical thrust engines 2.
11、3.1 Except as specified in 2.3.2, engines having a purely vertical thrust capability shall be numbered, in accordance with the principle in 2.1, in a sequence continuing after that of engines covered by 2.2 (see figure 2a). 2.3.2 Alternatively to 2.3.1, where a group of engines has a single control,
12、 that group shall be numbered in accord- ance with 2.3.1 and the engines in the group shall be designated by the suffixes A, B, etc. The suffixes shall be allocated in accordance with the principle in 2.1 (see figure 2b). e 2.4 Take-off booster engines Take-off booster engines shall be numbered, in
13、accordance with the principle in 2.1, in a sequence continuing after that of all other engines covered by 2.2 and 2.3. 3 NUMBERING OF CYLINDERS IN PISTON ENGINES NOTE - For the purposes of this clause, the observer is regarded as viewing the engine from the end remote from the propeller, or from the
14、 end remote from the shaft transmitting the greatest part of the power of the engine. 3.1 In-line piston engines 3.1.1 Single-bank engine (see figure 3a) The cylinders of an engine having one bank of cylinders in line shall be numbered 1, 2, 3, etc., beginning with the cylinder nearest to the observ
15、er. 3.1.2 Double- and multi-bank engines (see figures 3b), 3c) and 3d) The rows of cylinders on an engine having two or more banks of cylinders shall be designated by the letters A, B, C, etc., applied respectively to each bank in the order in which its centre line would be encountered by a semi-pla
16、ne, centred upon the main shaft of the engine and rotating in a clockwise direction, starting from the twelve oclock position. Each cylinder shall be designated by a letter followed by a number, the letter indicating the bank, as described above, and the number indicating the position of the cylinde
17、r in the bank, when counted from the cylinder nearest to the observer. 3.2 Radial piston engines 3.2.1 Single-row and staggered double-row engines (see figures 4a) and 4b) The cylinders of single-row and staggered double-row engines shall be numbered 1, 2, 3, etc, in the order in which their centre
18、lines would be encountered by a rotating semi-plane as described in 3.1.2. 3.2.2 Staggered multi-row engine (see figure 4c) The rows of cylinders in a staggered multi-row engine shall be designated by the letters A, B, C, etc., beginning with the row nearest to the observer. Each cylinder shall be d
19、esignated by a letter, followed by a number, the letter indicating the row, as described above, and the number indicating the position of the cylinder in the row when counted by the method described in 3.2.1. 3 ES1 2M*4L 77 m Lb24bb 0100743 O W 2M 41 : 1977 I 3-0- 2Q- 1-Q- I n D6 D5 D4 D3 D2 D1 A6 A
20、5 A4 A3 A2 Al 86 A6 85 A5 84 A4 83 A3 82 A2 B1 Al Starting position of radial semi-plane Al 8 l* / Dia.Ai c1 61 W a) Single-bank engine b) Double-bank engine c) Multi-bank W engine dl Multi-bank X engine FIGURE 3 - Numbering of cylinders of in-line piston engines A A A 67 I . I (igjfij3 A6 A7 Al A2
21、A3 Starting position of radial semi-plane P G b) counter-clockwise tractor propeller; . c) clockwise pusher propeller; d) counter-clockwise pusher propeller. % 1 5 FIGURE 5 - Numbering of turbine engine combustion chambers 5 BSI 2M*43 77 W 3b24bb 8300745 4 W 2M 41 1977 IS0 482-1977 Amd. No. This Bri
22、tish Standard, having been prepared under the direction of the Aerospace Standards Committee, was published under the authority of the Executive Board on31 August 1977. British Standards institution, 1979 ISBN: O 580 09995 4 Copyright Users of British Standards are reminded that copyright subsists i
23、n all 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 shou
24、ld be addressed to the Publications Manager, 101 Pentonville Road, London N1 9ND (Telephone O1 -837 8801 ;Telex 2321 8). Date of issue Text affected Contract requirements Attention is drawn to the fact that this British Standard does not purport to include all the necessary provisions of a contract.
25、 Revision of British Standards British Standards are revised, when necessary, by the issue either of amendment slips or of revised editions. It is important that users of British Standardsshould ascertain that they are in possession of the latest amendments or editions. The following references relate to the work on this standard: Committee reference ACE/65 Draft for approval 95/71835 British Standards Institution - 2 Park Street London W1A 2BS Telephone 01-629 9000 - Telex 266933 771 2-0.2k-B
