Bsi bs en 04531 001 2017

BS EN 4531-001:2017 BSI Standards Publication Aerospace series — Connectors, optical, circular, single and multipin, coupled by triple start threaded ring — Flush contacts Part 001: Technical specification BS EN 4531-001:2017 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 4531-001:2017 It supersedes BS EN 4531-001:2012 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology A list of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 provisions of a contract Users are responsible for its correct application © The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 580 94214 ICS 49.060 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2017 Amendments/Corrigenda issued since publication Date Text affected BS EN 4531-001:2017 EN 4531-001 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM January 2017 ICS 49.090 Supersedes EN 4531-001:2012 English Version Aerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threaded ring - Flush contacts - Part 001: Technical specification Série aérospatiale - Connecteurs optiques circulaires, mono et multibroches, accouplement par bague filetée trois filets - Contacts affleurants - Partie 001: Spécification technique Luft- und Raumfahrt - Optische Rundsteckverbinder mit dreigängiger Schraubkupplung - Bündige Kontakte - Teil 001: Technische Lieferbedingungen This European Standard was approved by CEN on 29 July 2016 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 4531-001:2017 E BS EN 4531-001:2017 EN 4531-001:2017 (E) Contents Page European foreword Scope Normative references Terms and definitions Description Design Definition drawings and masses Tests 26 Quality assurance 31 Designation and marking 37 10 Packaging 37 11 Storage 37 BS EN 4531-001:2017 EN 4531-001:2017 (E) European foreword This document (EN 4531-001:2017) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN) After enquiries and votes carried out in accordance with the rules of this Association, this European Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017 This document supersedes EN 4531-001:2012 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 4531-001:2017 EN 4531-001:2017 (E) Introduction This family of fibre optic connectors coupled by triple start threaded ring is derived from MIL-DTL-38999L series III and EN 3645-001 It is suitable for use on aerospace on-board applications Two variants of female insert are defined: — Flush variant (A-Type female insert) is only possible with multimode contact; — Recessed variant (B-Type female insert) is required for single mode contact The optical contacts are capable of accepting single cable sizes up to a maximum of 1,9 mm outside diameter BS EN 4531-001:2017 EN 4531-001:2017 (E) Scope This European Standard specifies the general characteristics, the conditions for qualification, acceptance and quality assurance, as well as the test programs and groups for threaded ring coupling circular fibre optic self-locking connectors, fire-resistant or non fire-resistant, intended for use in a temperature range from −65 °C to 150 °C (cable dependent) continuous Normative references The following documents, in whole or in part, are normatively referenced in 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 EN 2591 (all parts), Aerospace series — Elements of electrical and optical connection — Test methods EN 3197, Aerospace series — Design and installation of aircraft electrical and optical interconnection systems EN 3645 (all parts), Aerospace series — Connectors, electrical, circular, scoop proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous EN 3909, Aerospace series - Test fluids and test methods for electrical and optical components and subassemblies EN 4531-002, Aerospace series — Connectors, optical, circular, single and multipin, coupled by triple start threaded ring — Flush contacts — Part 002: Specification of performance and contact arrangements EN 4531-101, Aerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threaded ring - Flush contacts - Part 101: Optical contact for EN 4641 multimode cable -55 °C to 125 °C Product standard EN 4533-004, Aerospace series — Fibre optic systems — Handbook — Part 004: Repair, maintenance and inspection EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts ISO 263, ISO inch screw threads — General plan and selection for screws, bolts and nuts — Diameter range 0,06 to in 1) EN 61300-3-33, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-33: Examinations and measurements — Withdrawal force from a resilient alignment sleeve using gauge pins (IEC 61300-3-33:2012) MIL-STD-1373, Screw thread, modified, 60° stub, double 2) MIL-DTL-38999L, Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect (Bayonet, Threaded, or Breech Coupling), Environment Resistant with Crimp Removable Contacts or Hermetically Sealed with fixed, Solderable Contacts General Specification for2) 1) 2) Published as ISO International Standardisation Organisation http://www.iso.ch/ Published as DoD National (US) Mil Department of Defense http://www.defenselink.mil/ BS EN 4531-001:2017 EN 4531-001:2017 (E) MIL-I-81969/8-10, Installing and removal tools, connector electrical contact, Types I and II, Class 2, composition A2) MIL-STD-454N, Electronic equipment, Standard general requirements for2) Terms and definitions For the purposes of this document, the terms and definitions given in EN 2591-100 apply Description 4.1 General The connectors utilise rear removable optical contacts with a ferrule diameter of 2,5 mm The receptacles and plugs contain either male insert or female insert The female insert is characterized by its ability to precisely align the optical contacts The precise alignment of the optical contacts is accomplished by alignment sleeves The connectors are polarized by means of keyways and keys; polarization is obtained before the male contacts enter the insert of the female contacts and before the coupling ring is engaged The position of the keying arrangement is given in 6.4 The connectors with shell size 9, 11 and 13 are 100 % scoop proof The visual check of full mating is obtained by masking of a red coloured band on the receptacle 4.2 Receptacle The receptacle contains five keyways in which the keys of the plug engage The main keyway is fixed and is wider than the others Polarization is ensured by the different positions which the secondary keyways may take The position of the insert is fixed relative to the main keyway 4.3 Plug The plug contains five keys which engage in the keyways of the receptacle The main key is wider than the others Polarization is ensured by the different positions which the secondary keys may take The position of the insert is fixed relative to the main key The coupling ring permanently fitted on the plug enables the connectors to be mated and unmated The internal thread of the coupling ring may be treated with a suitable lubricant compatible with the performance required in this European Standard 4.4 Materials and surface treatment 4.4.1 General When dissimilar metals are in close contact, adequate protection against corrosion shall be used for the electromotive force of the cell not to exceed 0,25 V (see EN 3197) 4.4.2 Shells The material of the connector shells and fittings shall be of suitable material and/or finish to protect against corrosion (see EN 3197) as specified in the product standard BS EN 4531-001:2017 EN 4531-001:2017 (E) 4.4.3 Optical contacts and alignment sleeves The material of the optical contacts shall be of suitable materials as specified in the appropriate product standard The optical contacts in both plug and receptacle are spring-loaded The spring force is defined in the product standard Alignment sleeves material shall be ZrO2 (Zirconia) Insert, seal, grommet and alignment pin materials shall have a hardness and mechanical characteristics consistent with the required use Design 5.1 Shells The connector shells shall be in one inseparable unit They contain teeth at the rear over the entire periphery and shall accommodate accessories The receptacle shall be fitted with an internal seal for a good sealing of the coupled shells The jam nut receptacle shell shall contain an O-ring seal (panel seal) The lock nut shall be provided with wire locking holes Threads shall conform to standards ISO 263, except for the triple start threads, which shall conform to standard MIL-STD-1373 The coupling ring shall be designed so that the optical contacts engage when it is screwed clockwise and disengage when it is unscrewed counter clockwise The coupling ring shall be designed to provide a hand grip profile Full locking of the connectors shall occur at approximately 360° On completion of tightening of the coupling ring, mechanical contact shall exist between the receptacle and plug shells Masking of a red colour band on the receptacle shall show that the connectors are correctly mated The front face of the plug shell shall seal when fully mated with the receptacle connector 5.2 Inserts The insert carrying the optical contacts shall be in hard material and have a cross section and radii such that no cracks, flaking or breaks can occur in normal operation The insert for contacts shall be non-removable; it shall be mechanically held in the shell Sealing shall be provided between the shell and insert The mechanical contacts retention system shall be integrated in the hard insert The design shall permit individual installation of the contacts without removal of the insert Insertion and removal of the contacts shall be from the rear For ease of operation, tools according to MIL-I-81969/8-10 standard (P/N for size 12) may be used Contact position identification shall be permanent and contrasted on the front face of the insert and on the rear face of the insert or grommet The male insert shall incorporate two optical contact alignment pins for multiway connectors The alignment pins improve the guiding of the inserts before optical contacts touch each other The female insert shall incorporate two optical contact alignment holes for multiway connectors and a guiding sleeve in each female insert cavity BS EN 4531-001:2017 EN 4531-001:2017 (E) Two variants of female insert are defined: — Flush variant (A-Type female insert) is only possible with multimode contact The zirconia sleeve withdrawal force measured under EN 61300-3-33 conditions shall be [1,9 N to 3,5 N]; — Recessed variant (B-Type female insert) is required for single mode contact The zirconia sleeve withdrawal force measured under EN 61300-3-33 conditions shall be [1,9 N to 3,5 N] for B-Type insert cavity Definition drawings and masses 6.1 General General dimensions and masses of receptacle, plug and protective cover are given in the product standards 6.2 Receptacle mating dimensions 6.2.1 Receptacle with female insert The mating dimensions of receptacles with female insert are shown in Figure for shell sizes 11, 13, 15, 19, 21, and 25, Figure for shell size and Table Same dimensions as EN 3645 connectors Dimensions and tolerances are in millimetres A (without ferrule) Key Thread When sleeve is in rear position Figure — Drawing for shell sizes 11, 13, 15, 19, 21 and 25 B BS EN 4531-001:2017 EN 4531-001:2017 (E) Tests 7.1 Tests according to EN 2591-100 The tests of EN 2591-100, applicable in the context of this European Standard as well as the details necessary for implementing them and for inspecting connector characteristics, are given in Table Table (1 of 5) EN 25916101 101 102 6301 302 6303 304 6305 6306 6307 308 309 310 311 312 26 Designation of the test Details Optical elements - Visual No loosening of parts, cracks, excessive wear, or detached examination parts Optical face undamaged and free from contamination when examined at 200 × magnification minimum Visual examination Applicable to protective caps only Examination of dimensions According to this document and product standard and mass NOTE In the case of a Qualified Inspection System, the parts unrelated to a Production Batch, may be used Optical elements - For performance and test method requirements refer to Endurance at temperature the applicable product standard for the component and cable under test Climatic sequence Not applicable Optical elements - Cold/low Duration: cycles pressure and damp heat Minimum temperature: (−65 ± 2) °C Measurement during test: At each transition point Damp heat steady state Not applicable Optical elements - Rapid For performance and test method requirements refer to change of temperature the applicable product standard for the component and cable under test Optical elements - Mould Not applicable growth Optical elements - Salt mist Connectors shall be: subjected to 50 mating/unmating cycles at a rate < cycles per minute exposed to salt mist for total duration of 500 h splited in 452 h mated for all Classes except Class F, and in 48 h unmated for all classes; cleaning Sand and dust Connector mated and positioned such that rear of free plug faces into the wind direction Wind velocity in duct: (3,5 ± 0,5) m/s Number of cycles: (one) Dry heat Not applicable Cold Not applicable Low air pressure Not applicable Air leakage For performance and test method requirements refer to the applicable product standard for the component and cable under test BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (2 of 5) EN 2591- Designation of the test Details 313 Driving rain (artificial) 6315 Optical elements - Fluid See Table for fluids, number of cycles, temperature and resistance time of immersion, and temperature of third phase 6314 6316 6317 6318 319 320 6321 6323 6324 325 6401 6402 6403 Not applicable Optical elements – Immer- Applicable, one mated pair shall be tested pressure kPa sion at low air pressure Optical elements - Ozone For performance and test method requirements refer to resistance the applicable product standard for the component and cable under test Optical elements – Flam- Method A mability Optical elements resistance - Fire Not applicable Gastightness of solderless Not applicable wrapped connections Simulated solar radiation at Not applicable ground level Optical elements - Damp Connector mated, 10 cycles, Method A heat, cyclic test Optical elements - Thermal Not applicable shock (Hermetically sealed devices) Optical elements – Inter- Not applicable facial sealing Ice resistance Not applicable Optical elements - Shock Method A, severity 300 Number of shocks: (three) each way for each of the (three) directions (9 (nine) shocks in all) Optical elements – Accele- Not applicable ration steady state Optical elements – Vibra- The samples are equally divided between the (two) tions vibrations test methods below Temperature: 25 °C 1) Method A, Figure 1, 20 gn 12 h in total equally divided to main axis 2) Method B, Figure 3, Table 2, level J (two) axes (X and Y), (height) hours/axe 27 BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (3 of 5) EN 2591- Designation of the test 6404 Optical elements – Transverse load Details Shell size Torque N⋅m 09 11,3 11 33,9 13 45,2 15 56,5 19 67,8 21 90,4 25 6405 6406 407 408 Force is applied to the end of the plug or the adaptor in a plane perpendicular to the connector axis Optical elements - Axial For performance and test method requirements refer to load the applicable product standard for the component and cable under test Optical elements – Mecha- For performance and test method requirements refer to nical endurance the applicable product standard for the component and cable under test Durability of contact For performance and test method requirements refer to retention system and seals the applicable product standard for the component and (maintenance ageing) cable under test Mating and unmating forces Method A Shell size 09 11 13 15 19 21 25 409 28 113,0 Contact retention in insert Mating torque N⋅m max Unmating torque N⋅m 1,4 0,1 0,9 1,8 2,3 2,7 3,6 6,5 0,3 0,6 These values are increased by 50 % at −25 °C and by 25 % after test EN 2591-308 11 daN BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (4 of 5) EN 2591410 411 Designation of the test Details Insert retention in housing Connector not fitted with contacts (axial) Mechanical pressure applied: (700 ± 35) kPa with a minimum force of 115 N No displacement > 0,3 mm during and after application of the pressure Insert retention in housing (torsional) Shell size 09 11 13 15 19 21 25 6414 6415 427 601 602 603 604 605 607 Optical elements - Unmating of lanyard release optical connection elements Optical elements - Test probe damage Robustness of protective cover attachment Optical elements - Insertion loss Torque N⋅m 0,9 1,1 1,4 1,4 1,8 2,3 2,7 No angular displacement over 0,5° when and after the torque is applied Not applicable Not applicable Force applied: 22 N For performance and test method requirements refer to the applicable product standard for the component and cable under test Optical elements - Variation Method B, no optical discontinuity, loss increase below of attenuation and optical db over duration > micro second discontinuity Optical connection - Change Not applicable of power distribution Optical elements - Cleaning For performance and test method requirements refer to capability of optical face the applicable product standard for the component and cable under test Optical elements - Return For performance and test method requirements refer to loss the applicable product standard for the component and cable under test Optical elements - For performance and test method requirements refer to Immunity to ambient light the applicable product standard for the component and coupling cable under test 29 BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (5 of 5) EN 2591- Details 608 Optical elements - Nuclear Not applicable radiation 610 Optical elements - Effective- For performance and test method requirements refer to ness of cable attachment - the applicable product standard for the component and Cable pulling cable under test 609 611 612 613 614 615 617 30 Designation of the test Optical elements - Effective- For performance and test method requirements refer to ness of cable attachment - the applicable product standard for the component and Cable cyclic flexing cable under test Optical elements - Effective- For performance and test method requirements refer to ness of cable attachment - the applicable product standard for the component and Cable torsion cable under test Optical elements - Effective- For performance and test method requirements refer to ness of cable attachment - the applicable product standard for the component and Cable axial compression cable under test Optical elements - Impact Severity: light test Optical elements – Connec- Load: 500 N tor radial compression Duration: 15 s Optical elements – Connec- For performance and test method requirements refer to tion integrity at tempe- the applicable product standard for the component and rature cable under test Optical elements - Tempera- For performance and test method requirements refer to ture cycling the applicable product standard for the component and cable under test BS EN 4531-001:2017 EN 4531-001:2017 (E) 7.2 Special tests See Table Table — Resistance to fluids Fluid Immersion Drying Duration Temperature temperature Fuel Category Mineral hydraulic fluid Synthetic hydraulic fluid Mineral lubricant Synthetic lubricant Test fluid number EN 3909 15 15 9 Cleaning products 13 Extinguishing fluid 17 De-icing fluid Cooling fluid Quality assurance 11 °C 25 15 85 15 15 15 15 19 15 10 °C 85 100 85 100 120 125 150 25 125 7 25 65 50 100 50 25 25 Number of cycles 8.1 General Quality assurance shall conform to EN 9133 8.2 Qualification 8.2.1 General Qualification of a model (see EN 4531-002) is obtained: — either when the specimens of this model as defined in 8.2.2 have satisfied the applicable tests in groups to 6; or — by extension of qualification: qualification of a model very similar to a model already qualified, may be obtained by performing a small number of additional tests or by analogy by structural similarity 8.2.2 Sampling and definition of specimens If more than one fibre/cable arrangement is being tested, the specimens shall be split in equal quantities for each group See Table 31 BS EN 4531-001:2017 EN 4531-001:2017 (E) Table Test group No All specimens pairs One pair of each shell size with complete specimens minimum 8.2.3 Number of complete specimens (receptacle, plug and pro-caps) as applicable One pair of each shell size with complete specimens minimum One pair of each shell size with complete specimens minimum One complete specimen for each test fluid One pair of each shell size with complete specimens minimum One pair of each shell size with complete specimens minimum Preparation of specimens All specimens contacts shall be terminated, to m minimum long cables 8.2.4 Program of qualification tests The qualification approval tests are defined in Table and shall be carried out in the sequence specified in Table Test EN 2591-6306 is to be performed on materials and is not included in the groups below If the materials used comply with group of MIL-STD-454N, Requirement 4, test EN 2591-6306 is not performed Table (1 of 4) Designation of the test EN 2591- Remarks Group Examination of dimensions and mass 102 Visual examination 6101 Group Immunity to ambient light coupling 607 Insertion loss Return loss Mating and unmating forces Visual examination Mating and unmating forces 601 605 408 6101 408 Salt mist 6307 Flammability 6317 Return loss Visual examination 32 605 6101 Conformance to Clause and product standard After termination Overtightening not required Overtightening not required Variation of insertion loss as EN 2591-601 For singlemode only Destructive material test Can be performed as a stand alone test BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (2 of 4) Designation of the test EN 2591- Remarks Group Durability of contact system and seals retention 407 Cold/low pressure and damp heat 6303 Variation of insertion loss as EN 2591-601 Visual examination as EN 2591-6101 Return loss 605 For singlemode only Rapid change of temperature Mating and unmating forces 6305 408 Optical elements - Immersion at low air pressure 6314 Return loss 605 Mechanical endurance 6406 Vibrations 6403 Shock 6402 Return loss 605 Visual examination 6101 Insert retention in housing (axial) 410 Contact retention in insert Insert retention (torsional) Robustness attachment of in housing protective Visual examination cover Insertion loss as EN 2591-601 Visual examination as EN 2591-6101 Overtightening not required Variation loss as EN 2591-601 Coupling and uncoupling torque as EN 2591-408, Method A Overtightening not required Visual examination as EN 2591-6101 For singlemode only Optical discontinuity as EN 2591-602 Insertion loss as EN 2591-601 Coupling and uncoupling torque as EN 2591-408, Method A Visual examination as EN 2591-6101 Optical discontinuity as EN 2591-602 Insertion loss as EN 2591-601 Coupling and uncoupling torque as EN 2591-408, Method A Overtightening not required Visual examination as EN 2591-6101 For singlemode only 409 411 427 6101 33 BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (3 of 4) Designation of the test EN 2591- Remarks Group Endurance at temperature 6301 Visual examination 6101 Ozone resistance 6316 Visual examination 6101 Return loss Mating and unmating forces Group Connection integrity at temperature Fluid resistance 605 408 615 Insertion loss as EN 2591-601 For singlemode only Overtightening not required 6315 Coupling and uncoupling torque as EN 2591-408, Method A Transverse load 604 6404 Insertion loss as EN 2591-601 Return loss Axial load 605 6405 For singlemode only Group Cleaning capability of optical face Return loss Effectiveness of cable attachment Cable cyclic flexing Effectiveness of cable attachment Cable pulling Effectiveness of cable attachment Cable torsion Effectiveness of cable attachment Cable axial compression Connector radial compression 605 609 611 612 614 613 Return loss 605 34 Insertion loss as EN 2591-601 Coupling and uncoupling torque as EN 2591-408, Method A Visual examination as EN 2591-6101 610 Impact test Visual examination For singlemode only 6101 Variation of insertion loss as EN 2591-601 Coupling and uncoupling torque as EN 2591-408, Method A Visual examination as EN 2591-6101 Insertion loss as EN 2591-601 Coupling and uncoupling torque as EN 2591-408, Method A Visual examination as EN 2591-6101 For singlemode only BS EN 4531-001:2017 EN 4531-001:2017 (E) Table (4 of 4) Designation of the test EN 2591- Remarks Group Air leakage 312 Damp heat, cyclic test 6321 Insertion loss 601 Sand and dust 308 Return loss 605 Visual examination Group 6101 Temperature cycling 617 Visual examination 6101 Return loss 8.2.5 605 Numbers of active channels For singlemode only For singlemode only The number of active channels for measurement purposes is given in Table Table Shell size 09 11 13 15 19 21 25 Number of active channels for measurement Remarks – minimum – – minimum Remaining cavities to be populated with dummy contacts or filler plugs minimum Remaining cavities to be populated with dummy contacts or filler plugs minimum minimum Remaining cavities to be populated with dummy contacts or filler plugs Remaining cavities to be populated with dummy contacts or filler plugs Optical contacts shall be chosen in such a way that they are located at different distances from the center, not close to each other and in different quadrants 35 BS EN 4531-001:2017 EN 4531-001:2017 (E) 8.3 Maintenance of qualification 8.3.1 Tests The following tests shall be carried out every 36 months (or manufacturing interval, if longer) on one pair of each shell size with complete specimens minimum for each test group of Table 8, specimens shall be taken at random in accordance with EN 9133 The manufacturer shall submit, to the mandated body, a table of tests which shall be carried out in accordance with Table 8.3.2 Sampling distribution All models shall be divided between the two groups of Table 10 Table 10 Designation of the test Group Visual examination 6101 Insertion loss 601 Examination of dimensions and mass Mating and unmating forces Mechanical endurance Damp heat, cyclic test Group 102 408 6406 321 Visual examination 6101 Endurance at temperature 6301 Visual examination 6101 Examination of dimensions and mass Mating and unmating forces 8.3.3 EN 2591- Acceptance 102 408 This inspection shall be done systematically on all production prior to delivery: EN 2591-6101 — Visual examination 36 BS EN 4531-001:2017 EN 4531-001:2017 (E) 8.3.4 Quality control Inspections which are intended to maintain the required quality level are in their entirety the responsibility of the manufacturer, ranging from materials through delivery of the product The quality department of the manufacturer shall be able to demonstrate, at any given time, that the product complies with the manufacturing documentation and with the product standard concerned There shall be a monitoring system in place for the various inspection phases This shall be evidenced by documents being kept available by the manufacturer for a period of five years and, if required submitted to the national supervising inspectorate on request Designation and marking Designation and marking are defined in the product standard 10 Packaging The connectors with dust caps installed shall be packed in transparent inert plastic bags The connectors and contacts shall be cleaned as per EN 4533-004 The designation required by the product standard shall be affixed on the packaging of connectors 11 Storage See EN 3645-001 37 This page deliberately left blank This page deliberately left blank NO 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