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1、International Standard INTERNATIONAL ORGANIZATION FOR STANOARDIZATION.MEI(BYHAPO Descriptors : aircraft equipment, electric connectors, terminal connectors, specifications, tests, type testing (tests). . H i2 Price based on 6 pages Copyright International Organization for Standardization Provided by
2、 IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards b
3、odies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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 organizati
4、ons, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in ac
5、cordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 8668/l was prepared by Technical Committee ISOITC 20, Aircraft and space vehicles. Users should note that all International Standards undergo revision from time to time and that any
6、reference made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 International Organization for Standardization, 1986 0 Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=N
7、ASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/l-1986 (E) Contents 1 Scope and field of application . 2 References. . 3 Definitions . Section one : Design requirements 4 Environmental conditi
8、ons 5 Mechanical specifications . 6 Electrical specifications 7 Marking . 8 Tools. . Section two : Type approval testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L . . . . . . . . . .
9、 . . . . . . . . . . . . . . . . . . . . Page . 1 1 . 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 9 Sampling for type tests . . . . . . .
10、. . . . . . . 10 Test conditions . . . . . . . . . . . . . . . . . . . . . 11 Test methods. . . . . . . . . . . . . . . . . . . . . . . . . 12 Test details. . . . . . . . . . . . . . . . . . . . . . . Section three : Production and quality testing 13 Production and quality tests . . . . . . . . . .
11、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 iii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MDTNo reproduction or network
12、ing permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MDTNo reproduction or networking permitted without license from IHS -,-,- IN
13、TERNATIONAL STANDARD IS0 8668/l-1986 (E) Aircraft - Terminal junction systems - Part 1 : Characteristics 1 Scope and field of application 1.1 This part of IS0 8668 specifies the general operating characteristics and standardization principles of terminal junc- tion systems in aircraft. It does not d
14、efine a specific pattern for the connection system from the point of view of dimensions, but lays down limits for the design and performance for each system. 1.2 This part of IS0 8668 lays down the basic requirements for the mechanical structure and electrical performances of ter- minal junction sys
15、tems as well as the basic environmental con- ditions in service. 1.3 IS0 8668/2 gives details of the tests referred to in this part of IS0 8668. NOTE - In order for a series of terminal junction systems to be con- sidered in conformity with IS0 8668, it is necessary to prepare a detail specification
16、 for each specific type of system. Detail specifications will be published as subsequent parts of IS0 8668 and will deal with the following aspects: a) sufficiently dimensioned drawings to ensure interchange- ability; b) environmental conditions, electrical performance and mechanical requirements; c
17、) drawings and illustrations of the gauges and tools necessary for the tests; d) a complete description of the type designations; e) type approval tests, type approval maintenance tests, produc- tion acceptance tests and production quality tests, together with the frequency of testing and severity o
18、f inspection levels; f) a declaration of performances and restrictions of use; g) any restrictions or variances from the general characteristic re- quirements stated in this part of IS0 8668. 2 References IS0 1966, Crimped joints for aircraft electrical cables. IS0 2100, Aircraft - Electrical connec
19、tors - Tests. IS0 7137, Aircraft - Environmental conditions and test pro- cedures for airborne equipment. 1) IS0 866812, Aircraft - Terminal junction systems - Part 2: Tests. 3 Definitions For the purposes of IS0 8668, the following definitions apply. 3.1 terminal junction system: An assembly of rem
20、ovable modules, mounted in a frame, and splices using common crimped contacts attached to the wires being connected. 3.2 module: Connection device consisting of one or more groups of non-removable contacts, arranged in cavities in an insulating casing, connected together according to a pre- establis
21、hed interconnection diagram and designed to accept removable crimp contacts. A module may be either a feed-back or feed-through type. 3.3 removable module: Module, either feed-back or feed- through, designed so that it may be positioned, moved and removed from the frame in order to achieve or modify
22、 the com- position of a terminal junction system. 3.4 feed-back module: Module with all contact cavities on the same side of the module. 3.5 feed-through module: Module with contact cavities on opposite sides of the module. 3.6 removable elements: Accessories generally associated with the modules, s
23、uch as end plate, module clamp, etc. 1) Endorsement, in part, of the publication EUROCAE ED-14A/RTCA DO-160A (a document published jointly by the European Organisation for Civil Aviation Electronics and the Radio Technical Commission for Aeronautics) 1 Copyright International Organization for Standa
24、rdization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/l-1986 (E) 3.7 group of contacts: Bussed assembly of non-removable contacts in a modu
25、le. 3.8 interconnection diagram (of a module); bussing ar- rangement : Electrical arrangement of the group or groups of contacts within a module. 3.9 frame; rail; track: In general, metal component of specified shape constituting both the device for mounting the modules and the removable elements an
26、d the device for fixing the assembly. 3.10 module clamp: Appropriate device with lateral tightening, generally made of metal, used to strengthen the at- tachment of an assembly of modules to the frame. 3.11 end plate: Removable wall, intended to be placed at each end of assembly of juxtaposed module
27、s in a frame. 3.12 spacer: Removable barrier made from insulating material intended to be inserted between two modules to en- sure supplementary insulation between them. 3.13 in-line junction; disconnect splice: Device with non- removable contacts in an insulated housing designed for incor- poration
28、 into a wire harness. 3.14 size (of a contact) : All those contacts the dimensions of which are in accordance with one control drawing. 3.15 rated current (of a contact): The permissible current between two adjacent interconnected contacts of the same size under normal atmospheric conditions. Sectio
29、n one : Design requirements 4 Environmental conditions 4.1 Temperature range Terminal junction systems shall be classified as follows, ac- cording to the maximum hot spot temperature for which they are intended : Class 1: - 55 to + 155 T Class 2: - 55 to + 175 OC Class 3: - 65 to + 200 OC NOTE - The
30、 temperature is the only classification stipulated in this International Standard. 4.2 Altitude Terminal junction systems shall be suitable for use at altitudes up to 31 000 m. 4.3 Sealing (immersion at low air pressure) Terminal junction systems shall be designed and constructed in such a way as to
31、 satisfy the requirements of test No. 14 specified in IS0 8668/2. 4.4 Vibration, acceleration and resistance to climatic conditions Terminal junction systems shall be designed and constructed in such a way as to satisfy the requirements of tests Nos. 9, 10 and 11 specified in IS0 8668/2. 4.5 Flammab
32、ility Terminal junction systems, in conformity with the specifica- tions of IS0 8668, shall not constitute a fire hazard. 4.6 Resistance to fluids Terminal junction systems and their accessories shall be designed so as to resist the fluids used in aircraft and to meet the requirements of test No. 18
33、 specified in IS0 8668/2. The applicable fluids shall be stated in the detail specification. 4.7 Salt spray The materials, finish and construction of terminal junction systems shall be such that they are sufficiently resistant to deterioration caused by salt spray to satisfy the requirements of test
34、 No. 16 specified in IS0 8668/2. 4.8 Dust Compliance with the requirements of IS0 8668 with respect to the resistance to deterioration caused by dust is not man- datory, but when it is specifically required by the user, or claim- ed by the manufacturer, terminal junction systems shall satisfy the re
35、quirements of test No. 23 specified in IS0 2100. 4.9 Magnetic effect It shall be stated in the detail specification whether terminal junction systems and their accessories are designed to satisfy the test requirements of IS0 7137. 5 Mechanical specifications 5.1 Sealing grommets - The sealing gromme
36、ts of terminal junction systems shall pro- vide an insulating support and shall seal, to the requirements specified in IS0 8668, the maximum and minimum outside diameter of cable specified in the detail specification. 2 Copyright International Organization for Standardization Provided by IHS under l
37、icense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/l-1986 (El 5.2 Contacts 6.4 Contact resistance 5.2.1 The contacts shall be of the crimped type and shall con- form to
38、the detail specification. The modules and splices shall satisfy the requirements of test No. 5 specified in IS0 8668/2. 5.2.2 The hardness of the crimped part of the barrel of all the contacts shall be within the range of 60 to 110 HV or shall give specified performance when crimped with a tool havi
39、ng inden- tors complying with the requirements of the detail specification (see 8.2). 7 Marking 7.1 Contact position identification The crimped part of the barrel of the contacts shall also have an inspection hole to ensure correct insertion of the conductor into the barrel. 7.1.1 In the absence of
40、an agreement with the national ap- proval body, the positioning and identification of the contacts shall be in conformity with 7.1.2, 7.1.3, 7.2 and 7.3. 5.2.3 A means shall be provided integral to the module and splice to lock the inserted crimp contact axially. 5.3 Sealing (immersion at low air pr
41、essure) 5.3.1 Terminal junction systems shall be watertight (immer- sion at low air pressure, see test No. 14 in IS0 8668/2) at all points on the removable module and splice, including the cable inlet. 7.1.2 Each group of contacts shall be marked. This marking shall be in clear contrast to the colou
42、r of the sealing grommet and, in addition, it shall be legible when the modules are mounted on the frame. 7.1.3 When the modules are mounted on the frame, a system of marking shall allow the position of each contact to be iden- tified. 5.3.2 Sealing plugs shall be specified by the detail specifica-
43、tion. 7.2 Module and splice identification The identification of the modules and splices shall be legible and indelible; it shall appear on the casing. 6 Electrical specifications 7.3 Frame identification 6.1 Voltage The working voltage of terminal junction systems between con- tacts and between gro
44、ups of contacts in a normal combination of environmental conditions (specified in clause 10) shall be at least 350 V d.c. or a.c. peak. The frame shall be identified in an indelible way on one of its lateral sides. 8 Tools The modules shall satisfy the requirements of test No. 4 specified in IS0 866
45、8/2. 6.2 Current Contacts of sizes 22,20, 16 and 12 shall be capable of receiving standard conductors of dimensions not greater than the nominal size of the contact. Individual contacts, when mounted in the module or splice, shall be capable of carrying the appropriate cable bunch rating under equiv
46、alent conditions. 6.1 Contact insertion and extraction tools If tools are necessary to insert and extract the contacts, their use shall not adversely affect the characteristics specified in this part of IS0 8668. These tools shall preferably be non-metallic and shall not require lubricating in order
47、 to make a satisfactory insertion. 8.2 Crimping tools 6.3 Insulation resistance The modules and splices shall satisfy the requirements of test No. 3 specified in IS0 866812. Crimping tools shall be such that they produce a crimp joint performance which complies with the requirements laid down in IS0
48、 1966. Section two : Type approval testing 9 Sampling for type tests 9.1 For the type approval of any range of terminal junction systems, a number of samples shall be chosen representing all variations in the range (e.g. size of module, class, arrangement of contacts), together with all variations i
49、n accessories. The selection shall be subject to agreement by the national approval body and shall be included as an appendix to the detail specification (see note in clause 1). 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:32:30 MD