1、BRITISH STANDARD AEROSPACE SERIES BS2C4:1973 Incorporating Amendment Nos.1 and2 Specification for Coupling dimensions for aero-engine refrigerant pressure replenishment connections UDC 629.7.03:621.43713:629.7.063.4:621.643.415BS2C4:1973 This British Standard, having been approved by the AerospaceIn
2、dustry StandardsCommittee, waspublished underthe authorityof the Executive Boardon 31October1973 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for approval 72/34767 ISBN 0 580 07816 7 Foreword This British Standard relates only to feat
3、ures affecting the coupling to an aircraft of the hose unit or adaptor for the delivery under pressure of supplies of aero-engine refrigerant: it does not specify all the requirements for the connections. The standard implements the requirements of ISO485 “Aircraft water-methanol pressure connection
4、s” of the International Organization for Standardization, prepared at the request of the International Air Transport Association as one of a series of standards for aircraft ground servicing connections suitable for adoption on an international basis. This revision enlarges the scope of the standard
5、 from methanol-water to aero-engine refrigerant applications and incorporates editorial amendments consequent on the publication of ISO485. It includes a change of position tolerances on the mating features of the inch connection to ensure engagement in the extreme adverse tolerance condition and in
6、terchangeability with that of ISO485. This standard makes reference to the following British Standard: BS 2856 “Precise conversion of inch and metric sizes on engineering drawings”. NOTEWhere metric equivalents are stated the figures in inch units are to be regarded as the standard. The metric conve
7、rsions are approximate. A table is given in Appendix A to provide a ready means of calculating the approximate metric equivalents of the inch values. More accurate conversions should be based on the table in BS350, “Conversion factors and tables” or in BS2856, “Precise conversion of inch and metric
8、sizes on engineering drawings”. A 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 o
9、f pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover 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
10、. Amendments issued since publication Amd. No. Date Comments 2643 June 1978 3326 August 1982 Indicated by a sideline in the marginBS2C4:1973 BSI 08-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 Dimensions 1 Appendix A Table for conversion of inches to approximatemillimetre equivalents
11、 Inside back cover Figure 1 Coupling dimensions and connection detail for inch aero-engine refrigerant pressure replenishment connection 1 Figure 2 Space envelope and connection detail for inch aero-engine refrigerant pressure replenishment connection 2 Figure 3 Typical ground half view 2 Figure 4 C
12、oupling dimensions and connection detail for1 inch aero-engine refrigerant pressure replenishment connection 3 Figure 5 Space envelope and connection detail for1 inch aero-engine refrigerant pressure replenishment connection 4 Figure 6 Typical ground half view 4ii blankBS2C4:1973 BSI 08-1999 1 1 Sco
13、pe This British Standard specifies the basic dimensional requirements for connections on aircraft to ensure coupling to ground equipment supplying engine refrigerant under pressure. Provision is made for two sizes of connection: inch suitable for rates of flow up to25gallons(114litres) per minute. 1
14、 inch suitable for rates of flow up to120gallons(546litres) per minute. 2 Dimensions 2.1 The dimensions of the connection shall conform to the basic requirements shown in Figure 1 or Figure 4. 2.2 The clearance allowed in the aircraft structure surrounding the connection for the introduction and han
15、dling of the hose unit shall be as indicated in Figure 2 or Figure 5. Detail of locking flange NOTEIn this revised drawing, arrow A has been amended to terminate at the face of the valve. Section of selective pin holes NOTE AThe valve face is to be flat within this diameter and no part of the valve
16、may extend beyond this face, but it may be recessed up to0.030in to allow for compressibility of valve seal. Configuration of the valve behind this face is optional. NOTE BThe valve is to be spring-loaded. Loading at0.656in travel isnotto exceed10lbf (44.5N) and loading in the valve shut position is
17、 tobe3 lbf to5lbf(15.6N to22.25N). Dimensions are in inches Dimensional tolerance 0.005in Angular tolerance 15 Third angle projection NOTE 3slots are identical. Enlarged scrap view in direction of slot Figure 1 Coupling dimensions and connection detail for inch aero-engine refrigerant pressure reple
18、nishment connectionBS2C4:1973 2 BSI 08-1999 Figure 2 Space envelope and connection detail for inch aero-engine refrigerant pressurereplenishment connection Figure 3 Typical ground half viewBS2C4:1973 BSI 08-1999 3 Figure 4 Coupling dimensions and connection detail for1 inch aero-engine refrigerant p
19、ressure replenishment connectionBS2C4:1973 4 BSI 08-1999 Figure 5 Space envelope and connection detail for1 inch aero-engine refrigerant pressurereplenishment connection Figure 6 Typical ground half viewBS2C4:1973 BSI 08-1999 Appendix A Table for conversion of inches to approximate millimetre equiva
20、lents Example of use of table: 1 9 / 16 in=1.56in=25.4+12.7+1.524=39.6mm 0.875in=20.32+1.778+0.127=22.2mm These examples give arithmetic conversions. For conversion to the required accuracy to ensure dimensional interchangeability, use BS2856. in mm 1 2 3 4 5 6 7 8 9 10 25.4 50.8 76.2 101.6 127.0 15
21、2.4 177.8 203.2 228.6 254.0BS2C4:1973 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Ch
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