1、BSI Standards Publication BS ISO 8267-2:2015 Aircraft Tow bar attachment fittings interface requirements Part 2: Regional aircraftBS ISO 8267-2:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8267-2:2015. It supersedes BS ISO 8267-2:2005 which is withdra
2、wn. The UK participation in its preparation was entrusted to Technical Committee ACE/57, Air cargo and ground support equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provision
3、s of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 88914 1 ICS 49.100 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published
4、under the authority of the Standards Policy and Strategy Committee on 31 October 2015. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 8267-2:2015 ISO 2015 Aircraft Tow bar attachment fittings interface requirements Part 2: Regional aircraft Aronefs Exigences dinter
5、face des ferrures dattache de barre de tractage Partie 2: Aronefs rgionaux INTERNATIONAL STANDARD ISO 8267-2 Second edition 2015-10-15 Reference number ISO 8267-2:2015(E)BS ISO 8267-2:2015ISO 8267-2:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerlan
6、d All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be request
7、ed from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 8267-2:2015ISO 8267-2:2015(E)Foreword iv Int
8、roduction v 1 Scope . 1 2 Normative references 2 3 Terms and definitions . 2 4 Requirements 2 4.1 Fitting location 2 4.2 Towing loads . 2 4.3 Aircraft mass categories 3 4.4 Fitting configuration, dimensions and clearances . 3 4.5 Tow bar fit . 4 5 Retrofit option . 4 Bibliography 6 ISO 2015 All righ
9、ts reserved iii Contents PageBS ISO 8267-2:2015ISO 8267-2:2015(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical
10、committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with
11、the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed fo
12、r the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent right
13、s. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this
14、 document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to
15、 Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 9, Air cargo and ground equipment. This second edition cancels and replaces the first edition (ISO 8267-2:2005), which has b
16、een technically revised. ISO 8267 consists of the following parts, under the general title Aircraft Tow bar attachment fittings interface requirements: Part 1: Main line aircraft Part 2: Regional aircraftiv ISO 2015 All rights reservedBS ISO 8267-2:2015ISO 8267-2:2015(E) Introduction The aim of this
17、 part of ISO 8267 is to standardize regional aircraft tow bar attachment fittings according to aircraft mass category (which determines tow bar forces), so that one tow bar can be used for all aircraft within that mass category. Throughout this part of ISO 8267, the minimum essential criteria are id
18、entified by the use of the key- word shall. Recommended criteria are identified by the use of the key-word should and, while not mandatory, are considered to be of primary importance in providing safe aircraft towing arrangements. Deviation from recommended criteria should only occur after careful c
19、onsideration, extensive testing, and thorough service evaluation have shown alternative methods to be satisfactory. ISO 2015 All rights reserved vBS ISO 8267-2:2015BS ISO 8267-2:2015Aircraft Tow bar attachment fittings interface requirements Part 2: Regional aircraft 1 Scope This part of ISO 8267 sp
20、ecifies the interface requirements for tow bar attachment fittings on the nose gear (when towing operations are performed from the nose gear) of conventional tricycle type landing gears of commercial civil transport aircraft. Its purpose is to achieve tow bar attachment fittings interface standardiz
21、ation by aircraft mass category (which determines tow bar forces) in order to ensure that a single type of tow bar with a standard connection can be used for all aircraft types within or near that mass category, so as to assist operators and airport handling companies in reducing the number of diffe
22、rent tow bar types used. This part of ISO 8267 is applicable to all new models of regional aircraft within the specified maximum ramp mass range which enter service or are designed after its date of publication. It does not apply to previously in service regional aircraft models, which present a con
23、siderable variety of tow bar attachment fittings. However, a simple retrofit modification is described that may make certain in-service fittings compatible with a tow bar head in conformity with this part of ISO 8267, where deemed appropriate in order to facilitate operation of such aircraft types a
24、t airports. This part of ISO 8267 i s a p p l i c a b l e t o r e g i o n a l c o m m e r c i a l t r a n s p o r t a i r c r a f t a i r w o r t h i n e s s c e r t i f i e d under FAR/EASA-CS Parts 25 with a maximum ramp mass of 50 000 kg (110 000 lb). It does not apply to aircraft airworthiness c
25、ertified under FAR/EASA-CS Parts 23 as commuter category aeroplanes; aircraft airworthiness certified under FAR/EASA-CS Parts 25 but with a maximum ramp mass of 50 000 kg (110 000 lb), which are covered by ISO 8267-1. Where a family of existing or contemplated aircraft types bridges two mass categor
26、ies, use a single tow bar attachment fitting interface for all of them, and consider the use of the standard dimensions for the higher mass category, be it part of this part of ISO 8267 or ISO 8267-1, throughout the family. NOTE As far as practical, this part of ISO 8267 was defined in order to be c
27、ompatible with as many existing aircraft types as possible in the mass category concerned. INTERNATIONAL ST ANDARD ISO 8267-2:2015(E) ISO 2015 All rights reserved 1BS ISO 8267-2:2015ISO 8267-2:2015(E) 2 Normative references The following documents, in whole or in part, are normatively referenced in
28、this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Federal Aviation Regulations (FAR) 14CFR Part 25, Airworthiness Standards: Transpor
29、t category airplanes, paragraph 25.509, Towing loads 1) EASA CS-25, Airworthiness Standards: Transport category aeroplanes, paragraph 25.509, Towing loads 2) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 main line aircraft civil passenger a
30、nd/or freight transport aircraft with a maximum ramp mass of 50 000 kg (110 000 lb) 3.2 regional aircraft civil passenger and/or freight transport aircraft with a maximum ramp mass of 10 000 kg (22 000 lb) and 50 000 kg (110 000 lb) 3.3 maximum ramp mass MRW maximum mass allowable for an aircraft ty
31、pe when leaving its parking position either under its own power or towed, comprising maximum structural take-off mass (MTOW) and taxiing fuel allowance 4 Requirements 4.1 Fitting location The fitting shall be designed to enable simple attachment of the tow bar at the front of the aircraft nose landi
32、ng gear for push/pull towing operations. No fitting is required at the rear of the nose landing gear. An axle fitting may be used in the event of two-wheel nose landing gear. This is acceptable providing the towing loads do not exceed those specified in this part of ISO 8267 and the aircraft is desi
33、gned accordingly. 4.2 Towing loads The aircraft nose landing gear tow bar attachment fitting shall be able to withstand the limit towing loads prescribed in FAR/EASA-CS 25, paragraphs 25.509 (a), (c) and (d), based on the following towing load F TOW(N): F TOW= 0,30 M r g (where M ris the design maxi
34、mum ramp mass of the aircraft and g is the mean acceleration due to gravity), when M r 13 600 kg (30 000 lb); F TOW= 6 M r g, when 13 600 kg (30 000 lb) 45 360 kg (100 000 lb). 1) FAR Part 25 constitute the USA government transport aircraft airworthiness regulations, and can be obtained from the fol
35、lowing address: US Government Printing Office, Mail Stop SSOP , Washington DC 20402-9328, USA. 2) EASA-CS Part 25 constitute the European Union transport aircraft airworthiness regulations, and can be obtained from the following address: www.easa.europa.eu2 ISO 2015 All rights reservedBS ISO 8267-2:
36、2015ISO 8267-2:2015(E) 4.3 Aircraft mass categories See Table 1. Table 1 Aircraft mass categories Masses in kilograms (values in pounds in parentheses) Category Maximum ramp mass, M r I 10 000 (22 000) M r 22 680 (50 000) II 13 600 (30 000) M r 50 000 (110 000) The tow bar attachment fitting categor
37、y shall be selected in such a way that no change of type will become necessary during aircraft development. Aircraft of a design which is near the upper limit of a mass category may be classified in the next higher category to allow for mass growth (see Clause 1). 4.4 Fitting configuration, dimensio
38、ns and clearances The standard configuration of the attachment fitting shall be a horizontal cylindrical pin with the dimensions given in Figure 1 and in Table 2. Table 2 Nominal pin dimensions Dimensions in millimetres (values in inches in parentheses) Dimensions Category I II Diameter, A 19,05 25,
39、40 (0.75) (1.00) Length, B 38,10 63,50 (1.50) (2.50) ISO 2015 All rights reserved 3BS ISO 8267-2:2015ISO 8267-2:2015(E) Key 1: Diameter A 2: Length B NOTE Required space envelope for clearance: 3A above and below the towing spool centre. Figure 1 Dimensions of the pin 4.5 Tow bar fit The design of t
40、he tow bar device that clamps to the horizontal cylindrical pin shall be such that it: grips the pin uniformly over 93 % to 95 % of the length (dimension B); is adjustable in order to provide positive engagement on the pin when locked. 5 Retrofit option Where deemed appropriate in order to facilitat
41、e operation of such aircraft types at airports, in- service regional aircraft types within the specified maximum ramp mass range, which present tow bar attachment fittings with different dimensions but of an adaptable design, may be rendered compatible with standardized tow bars in conformity with t
42、his part of ISO 8267 through simple retrofit modifications. Figure 2 provides an example of such a possible retrofit modification.4 ISO 2015 All rights reservedBS ISO 8267-2:2015ISO 8267-2:2015(E) Dimensions in millimetres (inches) Key 1 machined steel spacer mass 0,23 kg (0,5 lb) approx. Figure 2 E
43、xample of retrofit modification for 19 mm (0.75 in) diameter, 76 mm (3.00 in) long existing tow bar attachment fitting (plan view cross section) ISO 2015 All rights reserved 5BS ISO 8267-2:2015ISO 8267-2:2015(E) Bibliography 1 ISO 8267-1, Aircraft Tow bar attachment fittings interface requirements P
44、art 1: Main line aircraft6 ISO 2015 All rights reservedBS ISO 8267-2:2015BS ISO 8267-2:2015ISO 8267-2:2015(E) ISO 2015 All rights reserved ICS 49.100 Price based on 6 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-relate
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