BS-ISO-8267-2-2005.pdf

BRITISH STANDARD BS ISO ? 8267-2:2005 Aircraft ? fittings interface requirements Part 2: Regional aircraft ICS 49.100 ? Tow bar attachment Incorporating Corrigendum No. 1 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8267-2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee? on 1 March 2006 © BSI 2006 ISBN 0 580 47878 5 National foreword This British Standard reproduces verbatim ISO 8267-2:2005 and implements it as the UK national standard. Together with BS ISO 8267-1:2005 it replaces The UK participation in its preparation was entrusted to Technical Committee ACE/57, Air cargo and ground support equipment, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep ? UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its 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 inside front cover, the ISO title page, pages ii to iv, pages 1 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 16442 May 2006 Addition of supersession information. Corrigendum No. 1 BS C 21-1:1997, ISO 8267:1997 which is withdrawn. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 8267-2:2005(E) INTERNATIONAL STANDARD ISO 8267-2 First edition 2005-08-15 Aircraft Tow bar attachment fittings interface requirements Part 2: Regional aircraft Aéronefs Exigences d'interface des ferrures d'attache de barre de tractage Partie 2: Aéronefs régionaux BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8267-2:2005 iii 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 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 the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8267-2 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 9, Air cargo and ground equipment. This first edition of ISO 8267-2, together with ISO 8267-1, cancels and replaces ISO 8267:1997, which has been 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 aircraft Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8267-2:2005 iv Introduction The aim of this 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 identified 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 consideration, extensive testing, and thorough service evaluation have shown alternative methods to be satisfactory. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Aircraft Tow bar attachment fittings interface requirements Part 2: Regional aircraft 1 Scope This part of ISO 8267 specifies 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 standardization 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 different 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 considerable 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 at airports. This part of ISO 8267 is applicable to regional commercial transport aircraft airworthiness certified under FAR/JAR Parts 25 with a maximum ramp mass of u 50 000 kg (110 000 lb). It does not apply to ? aircraft airworthiness certified under FAR/JAR Parts 23 as commuter category aeroplanes; ? aircraft airworthiness certified under FAR/JAR 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 categories, 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 compatible with as many existing aircraft types as possible in the mass category concerned. BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 2 Normative references The following referenced documents are indispensable for the application of this document. 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: Transport category airplanes, paragraph 25.509, Towing loads 1) Joint Airworthiness Regulations (JAR) Part 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 and/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 u 50 000 kg (110 000 lb) 3.3 maximum ramp mass MRW maximum mass allowable for an aircraft type 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 landing gear for push/pull towing operations. No fitting is required at the rear of the nose landing gear. NOTE 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 designed accordingly. 1) FAR Part 25 constitute the USA government transport aircraft airworthiness regulations, and can be obtained from the following address: US Government Printing Office, Mail Stop SSOP, Washington DC 20402-9328, USA. 2) JAR Part 25 constitute the European governments transport aircraft airworthiness regulations, and can be obtained from the following address: JAA Headquarters, Saturnsstraat 8-10, P.O. Box 3000, NL 2130 Hoofddrop, Netherlands. BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 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/JAR 25, paragraphs 25.509 (a), (c) and (d), based on the following towing load FTOW(N): ?FTOW= 0,30 Mr? g (where Mris the design maximum ramp mass of the aircraft and g is the mean acceleration due to gravity), when Mru 13 600 kg (30 000 lb); ?FTOW= r 204100 kg 6 70 Mg?, when 13 600 kg (30 000 lb) ? Mru 45 360 kg (100 000 lb); ?FTOW= 0,15 Mr? g, when Mr? 45 360 kg (100 000 lb). 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 I10 000 (22 000) Mru 22 680 (50 000) II13 600 (30 000) Mru 50 000 (110 000) The tow bar attachment fitting category 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, dimensions 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) Category Dimensions III 19,05 25,40 Diameter, A (0,75) (1,00) 38,10 63,50 Length, B (1,50) (2,50) BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 Required space envelope for clearance: 3A above and below the towing spool centre. Key 1 diameter A 0 0,125? mm ? 0 0,005 in ? 2 length B 0,5 0 ? mm ? 0,020 0 in ? Figure 1 Dimensions of the pin 4.5 Tow bar fit The design of the 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 facilitate 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 this part of ISO 8267 through simple retrofit modifications. Figure 2 provides an example of such a possible retrofit modification. BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 Dimensions in millimetres (inches) Key 1 machined steel spacer mass 0,23 kg (0,5 lb) approx. Figure 2 Example 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) BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 Bibliography 1 ISO 8267-1, Aircraft Tow bar attachment fittings interface requirements Part 1: Main line aircraft BS ISO 8267-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 15:22:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO ? 8267-2:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. 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