1、AECMA STANDARD NORME AECMA AECMA NORM I I 0 aecma 2000 prEN 4585 Edition P 1 June 2000 I PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fax. (+32) 2 775 81 1 1 Edition approved for publication 2000-06-30 ICs: 49.060
2、Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 B-1200 BRUXELLES Descriptors: aircraft industry, aircraft equipment, clip, clamp, quality assurance, specification, characteristic, inspection, test Srie arospatiale Colliers lyre Spcification technique EN
3、GLISH VERSION Aerospace series Clips, spring tension Technical specification Luft- und Raumfahrt Federklammern Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on g
4、reen paper for the needs of AECMA- Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeabili
5、ty is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formai agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European
6、Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue JeamJacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C8 Chairman Mr Feltham COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Han
7、dling ServicesPage 2 STD*AECMA PREN 4585-ENGL 2000 II LOL2311 0018517 2hT II prEN 4585: 2000 Contents . , , . . .,_. 3 . 3 3 5 6 1 . . ._._._ 2 3 Normative references . . . . . . , , . .I . . . . .I. . . . . 4 Quality assurance . . . . . . . ,. 5 Annex A (normative) - Installation and removal of the
8、 mandrel Annex 6 (informative) - Retention resistance test bench Requirements. . . . , . , , , , , , . , , , , , , , . , , , , , . , , , . , , , , , , , , , , . , . . , . _, . . . COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services STD-AEC
9、MA PREN 4585-ENGL ZOO0 I LOL23LL 0018518 1Tb D Page3 prEN 4585: 2000 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for spring tension clips for the support of electrical harnesses, in alloy steel for aerospace applications. It is applicable whenever r
10、eferenced. 2 Normative references IS0 2859-1 IS0 3452 IS0 3534-1 977 IS0 4288 EN 3042 TR 4586 TR 4587 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by lot inspection Non-destructive testing - Penetrant inspection - Gener
11、al principles Statistics - Vocabulary and symbols Geometrical product Specifications (GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Clips, s
12、pring tension - Design recommendations 1) Aerospace series - Clips, spring tension - Assembly recommendations 1) 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 batch quantity of finished spring clips, of the same type and same diameter, prod
13、uced from a material obtained from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments 3.2 Surface discontinuities 3.2.1 crack rupture in the material which may ext
14、end in any direction and which may be intercrystalline or transcrystalline in character 3.2.2 seam open surface defect 3.2.3 surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface lap 1) Published as AECMA Technical Report at the date of publicat
15、ion of this standard COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services3.2.4 inclusions non-metallic particles originating from the material manufacturing process. These particles may be isolated or arranged in strings. 3.3 test temperatu
16、re ambient temperature, unless otherwise specified 3.4 simple random sampling the taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen 2) 3.5 critical defect a defect that, according to judgement and experien
17、ce, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item 2) 3.6 major defect a defect other than critical, that is likely to result in a failure
18、 or to reduce materially the usability of the considered product for its intended purpose 2) 3.7 minor defect a defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing
19、 on the effective use or operation of this product 2) 3.8 sampling plan a plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 2) 3.9 limiting quality in a sampling plan, the quality level which corresponds to the specified 1 O % proba
20、bility of acceptance 3.10 acceptance quality limit (AQL) a quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance It is the maximum per cent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspecti
21、on can be considered satisfactory as a process average 2). 2) Definition taken from IS0 3534 COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSTD.AECMA PREN Y585-ENGL 2000 6 LO12333 0038520 854 Page 5 prEN 4585: 2000 3.1 1 retention resi
22、stance the minimum radial forces that the spring clip shall oppose to the removal of the retained part 3.1 2 grip range all harness nominal diameters which can be retained by a spring clip size 4 Quality assurance 4.1 Qualification EN 3042 Qualification inspections and tests (requirements, methods,
23、sample size) are specified in table 1. They shall be carried out on: - each type and size of spring clip; - 5 spring clips selected from a single batch by simple random sampling. The test programme may possibly be reduced, or the qualification be granted without inspection or testing: any such decis
24、ion shall be based on the results obtained on similar types and diameters of spring clips provided that the design and manufacturing conditions are identical. It shall be clearly identified on the test report. Table 2 indicates the allocation of spring clip samples for the inspections and tests. 4.2
25、 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the spring clips constituting the batch satisfy the requirements of this stan
26、dard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of spring clips) are specified in table 1. They shall be carried out on each batch. Spring clips from the batch to be tested shall be selected by simple random sampling. Each spring clip may be submitted to sever
27、al inspections or tests. If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspection and testing. In this case, the number of spring clips submitted to these inspections and tests is the same as that sub
28、mitted for qualification inspection and tests. 4.2.3 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. 4.2.4 Inspection and test report A test report showing actual numerical values shall be provided if specified in the purchase or
29、der, COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSTD.AECMA PREN 4585-ENGL 2000 M 1012311 0018521 Page 6 prEN 4585: 2000 5 Requirements See table 1. Table 1 - Technical requirements and test methods Clause i.1 i.2 i.3 i.3.1 - i.3.2 -
30、 i.3.3 5.4 5.4.1 :ontinued Characteristic Material Dimensions, tolerances of form and position Manufacturing Surface roug hness Surface discontinuities Surface coating Mechanical properties Mandrel assembly for mechanical properties tests Requirement n accordance with the product standard or definit
31、ion document n accordance with the product jtandard or definition document n accordance with the product standard or definition document spring clips shall be free from surface defects indicated in 3.2 iable to have an adverse affect on their characteristics and endurance. :racks are not permitted.
32、n accordance with the product jtandard or definition document Inspection and test method Q/A a Sample size Caution shall be taken because I I IS0 3452 IQI 5 I A I Tables 3 and 4 In the event of any doubt arising as to the nature of the defects detected, inspect spring clips under low magnification a
33、fter sectioning. See applicable coating Standard. Spring clips shall be installed by the method given in TR 4587 on the upper horizontal surface of a test block designed in accordance with TR 4586. Unless otherwise specified, the installed spring clips shall be tested individually with a stainless s
34、teel mandrel having a surface roughness Ra = 1,6 per IS0 4288 with a diameter equal to the maximum value of the grip range given in the product standard or definition document. The mandrel shall be installed radially into the spring clip (see Annex A, normative). NOTE A tube may also be used instead
35、 of a mandrel for the test. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services - STD.AECflA PREN 4585-ENGL 2000 LOL23LL 00B8522 627 Page 7 prEN 4585: 2000 The mandrel shall be fitted into the spring clips for this test according to 5.4.1.
36、 The test block shall then be immersed in a (3,5 f 0,l) % sodium chloride (NaCI) aqueous solution for 8 to 1 O min at ambient temperature. The assembly shall then be removed from the aqueous solution and dried in air at ambient temperature for the remainder of 1 h. This subsequent immersion and dryi
37、ng process shall be repeated to a otal of 50 cycles. NOTE The NaCI solution should contair a dry basis of no more than 0,l % o sodium iodide and 0,s % of tota imDurities. Table 1 (continued) Spring clips shall meet thi retention resistance given ii figure 1. Cracks are not permitted 01 l the spring
38、clips after this test. Clause The mandrel shall be installed int the spring clips for this test accordin to 5.4.1. The test block shall then be put in an oven and be maintained at the maximum operating temperature given by product standard or definition document with a tolerance off 10 C for at leas
39、t 1 h. The assembly shall then be removed from the oven and cooled in air to ambient temperature. Repeat above cycle a total of x 50. Each two cycles, when the spring clip is cooled, the mandrel shall be pulled-out radially. Each six cycles and at the end of this ltest the retention force shall be I
40、 measured as 5.4.1. 4.2 - .4.3 5.4.4 Zharacterlstic :orrosion eststance etention es ista nce Reusability Reqolrement Metallic spring clips shall withstand this corrosion without any of the following defects after the completion of the mechanical property tests: - indications of cracks or pitting whe
41、n visually examined at i O times magnification; - indication of intergranular or transgranular corrosive attack during metallurgical examination of transversal sections of the spring clip. Spring clips shall meet the retention resistance given in figure i. Inspection and test method Y ample size 5 -
42、 5 5 continued COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesPage 8 prEN 4585: 2000 Surface discontinuities Surface coating Table 1 (concluded) 5.3.2 xxxxx 5.3.3 xxxxx Characteristic Requirement ! Retention resistance Product identifi
43、cation Destructive Product Marking in accordance with the identification product standard or definition document Packaging Spring clips shall be packed in such a way as to prevent any damage or corrosion occurring in the course of handling, transportation and storage. Each basic package shall only c
44、ontain spring clips with the same part number and batch number. Each basic package shall bear a label upon which is legibly recorded: - designation as specified by the product standard or definition document; - quantity; - batch number; - manufacturers name and trade mark. Labelling 5.4.3 xxxxx 5.6
45、xxxxx Inspection and test method Corrosion resistance Reusability Visual examination 5.4.2 xxxxx 5.4.4 xxxxx Visual examination Visual examination Table 2 -Allocation of qualification testing requirements A Sample size 5 Tables 3 and 4 100 % 100 % Type of test _ _ a Tests to be carried out prior to
46、coating. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services- - Page 9 prEN 4585: 2000 STD.AECMA PREN 4585-ENGL 2000 LOL23LL 0018524 4TT = L Major Minor Table 3 - Classification of defects 0,065 % Surface discontinuities Attaching holes di
47、mension and location Sharp corners Coating Overall dimensions Location of the axis of the mandrel Other dimensional Characteristics not listed above 130 % 2,5 % 4,O % I I Categoryofdefect I AQL I Characteristic concerned I Table 4 - Sampling plans for visual inspections and dimensional characteristi
48、cs Batch slze I - 51 to 91 to 151 to 281 to 501 to 1201 to 3 201 to 1 o 001 to 35 001 to 2 50 90 150 280 500 1 200 3 200 10 O00 35 O00 150 O00 150 O01 + Use sampling plan above. 6 Use sampling plan below. I Sample size 100 % 13 20 32 50 80 125 200 31 5 500 800 Acceptance number (Ac) and limiting qua
49、lity (La) in accordance with the acceptance quality limit (AGIL) AQL 0,065 % AC AQL 1 % AC - - O + J, 1 2 3 5 7 10 14 LQ10 % AQL2,5 % Ac - - 3, 1 2 3 5 7 io 14 21 + AQL 4 % Ac - 1 2 3 5 7 10 14 21 + + - 27 25 20 18 14 12 10 9 - - - NOTE The data given in this table are based on single sampling plans for a normal inspection, as specified in IS0 2859- (tables 2-A and 6-A). Other sampling plans specified in IS0 2859-1 may be used (double or multiple sampling), but these shall be chosen in such way as to ensure an equivalent quali
