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prEN 3475-404 Public enquiry
Comment end date 2024-07-06
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 404 : Thermal shock

This document specifies a method of evaluating the performance of a cable after exposure to a thermal shock. It is intended to be used together with EN 3475-100.

prEN 3646-004 Public enquiry
Comment end date 2024-06-08
Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C continuous - Part 004: Receptacle, jam-nut mounting - Product standard

This document specifies the characteristics of the jam-nut mounted receptacles of the family of bayonet coupling circular connectors, intended for use in an operating temperature range of -65 °C to 175 °C or 200 °C continuous. This document applies to models specified in Table 4. For contact, filler plugs and rear accessories associated with this receptacle see EN 3646-002. For plugs and protective covers, see EN 3646-008 and EN 3646-009 respectively.

prEN 4533-003 Public enquiry
Comment end date 2024-06-08
Aerospace series - Fibre optic systems - Handbook - Part 003: Looming and installation practices

This handbook considers the best practices during initial design and how the practices chosen affect through life support of the installation. Looming and installation practices are a critical aspect of any aircraft electrical/avionics installation. In order to provide a reliable and efficient system, it is important that the fibre optic installation is designed for reliability and maintainability. This document provides technical advice and assistance to designers and engineers on the incorporation of fibre optic harnesses into an airframe, while, wherever possible, maintaining maximum compliance with current aircraft electrical harness procedures. All topics that are related to the installation of optical cables are addressed in EN 3197. These rules are applicable for fibre optic cables and connectors defined by EN specifications.

prEN 4533-002 Public enquiry
Comment end date 2024-06-08
Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement

This document examines the requirements to enable accurate measurement of fibre optic links from start of life and during the life cycle of the system from installation and through-service. This document explains the issues associated with optical link measurement and provides techniques to address these issues. This document discusses the measurement of key parameters associated with the passive layer (i.e. transmission of light through an optical harness). This document does not discuss systems tests, e.g. bit error rates.

prEN 4533-001 Public enquiry
Comment end date 2024-06-08
Aerospace series - Fibre optic systems - Handbook - Part 001: Termination methods and tools

1.1 General This document examines the termination of optical fibre cables used in aerospace applications. Termination is the act of installing an optical terminus onto the end of a buffered fibre or fibre optic cable. It encompasses several sequential procedures or practices. Although termini have specific termination procedures, many share common elements and these are discussed in this document. Termination is required to form an optical link between any two network or system components or to join fibre optic links together. The fibre optic terminus features a precision ferrule with a tight tolerance central bore hole to accommodate the optical fibre (suitably bonded in place and highly polished). Accurate alignment with another (mating) terminus is provided within the interconnect (or connector) alignment mechanism. As well as single fibre ferrules, it is noted that multi-fibre ferrules exist (e.g. the MT ferrule), and these are also discussed in this document. Another technology used to connect 2 fibres is the expanded beam. 2 ball lenses are used to expand, collimate and then refocus the light from and to fibres. Contacts are not mated together. It helps reducing the wear between 2 contacts and allows more mating cycles. This technology is less sensitive to misalignments and dust. Losses are remaining more stable than butt joint contact even if the nominal loss is higher. NOTE Current terminology in the aerospace fibre optics community refers to an optical terminus or termini. The term optical contact can be seen in some documents and has a similar meaning. However, the term contact is now generally reserved for electrical interconnection pins. The optical terminus (or termini) is housed within an interconnect (connector is an equivalent term). Interconnects can be single-way or multi-way. The interconnect or connector will generally house the alignment mechanism for the optical termini (usually a precision split-C sleeve made of ceramic or metal). It is important that the reader is aware of these different terms. An optical link can be classified as a length of fibre optic cable terminated at both ends with fibre optic termini. The optical link provides the transmission line between any two components via the optical termini which are typically housed within an interconnecting device (typically a connector) with tight tolerancing within the alignment mechanisms to ensure a low loss light transmission. This document explains the need for high integrity terminations, provides insight into component selection issues and suggests best practice when terminating fibres into termini for high integrity applications. A detailed review of the termination process can be found in Clause 4 of this document and is organized in line with the sequence of a typical termination procedure. The vast number of cable constructions and connectors available make defining a single termination instruction that is applicable to all combinations very difficult. Therefore, this handbook concentrates on the common features of most termination practices and defining best practice for current to near future applications of fibre optics on aircraft. This has limited the studies within this part to currently available ‘avionic’ silica fibre cables and adhesive filled butt-coupled type connectors. Many of the principles described, however, would still be applicable for other termination techniques. Other types of termination are considered further in EN 4533-004. It is noted that the adhesive based pot-and-polish process is applicable to the majority of single-way fibre optic interconnects connectors and termini for multi-way interconnects and connectors. They share this commonality. 1.2 Need for high-integrity terminations In order to implement a fibre optic based system on an aircraft, it is vital to ensure that all the constituent elements of the system will continue to operate, to specification, over the life of the system...

prEN 3646-006 Public enquiry
Comment end date 2024-05-25
Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 006: Receptacle, hermetic, jam-nut mounting - Product standard

This document specifies the characteristics of hermetic jam-nut mounted receptacles in the family of bayonet coupling circular connectors, intended for use in an operating temperature range of - 65 °C to 175 °C or 200 °C continuous. It applies to models specified in Table 4. For plugs and protective covers, see EN 3646 008 and EN 3646 009 respectively.

prEN 3646-001 Public enquiry
Comment end date 2024-05-25
Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 001: Technical specification

This document specifies the general characteristics, the conditions for qualification, acceptance and quality assurance, as well as the test programmes and groups for bayonet coupling circular connectors, intended for use in an operating temperature range of -65 °C to 175 °C or 200 °C continuous according to the class and models.

prEN 4604-010 Public enquiry
Comment end date 2024-05-25
Aerospace series - Cable, electrical, for signal transmission - Part 010 : Cable, coaxial, light weight, 50 ohms, 200 °C, type KX (light WD) - Product standard

This document specifies the required characteristics of a semi-rigid light weight coaxial cable, 50 Ω, type KX for use in aircraft electrical systems at operating temperature between −55 °C and 200 °C and specially for high frequency up to 6 GHz. Nevertheless, if needed, −65 °C is also acceptable as shown by rapid change of temperature test.

prEN 4641-001 Public enquiry
Comment end date 2024-05-25
Aerospace series - Cables, optical - Part 001: Technical specification

This document specifies the general characteristics, conditions for qualification, acceptance and quality assurance, as well as the test methods and groups for fibre optic cables with a cladding of 125 µm outside diameter.

prEN 4604-009 Public enquiry
Comment end date 2024-05-18
Aerospace series - Cable, electrical, for signal transmission - Part 009 : Cable, coaxial, light weight, 50 ohms, 180 °C, type KW (light WN) - Product standard

This document specifies the required characteristics of a semi-rigid light weight coaxial cable, 50 Ω, type KW for use in aircraft electrical systems at operating temperature between −55 °C and 180 °C and specially for high frequency up to 6 GHz. Nevertheless, if needed, −65 °C is also acceptable as shown by rapid change of temperature test.

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Telemetering (0) Temperature-measuring instruments (0) Terminology (principles and coordination) (0) Terracotta building products (0) Test conditions and procedures in general (0) Textile and leather technology (Vocabularies) (1) Textile auxiliary materials (0) Textile fabrics (1) Textile fibres in general (0) Textile glass materials (0) Textile machinery in general (0) Textiles (0) Textiles in general (0) Theatre, stage and studio equipment (0) Therapy equipment (0) Thermal and sound insulating materials (0) Thermistors (0) Thermoplastic materials (1) Thermosetting materials (0) Timber structures (0) Titanium (0) Tobacco, tobacco products and related equipment (0) Toys (2) Tractive stock (0) Trailing stock (0) Transformers. Reactors (0) Transfusion, infusion and injection equipment (0) Transmission systems (2) Transmissions, suspensions (0) Transport by rail (0) Transport by water (0) Transport layer (0) Trucks and trailers (0) Tyres in general (0) Valves (0) Valves in general (1) Ventilation and air-conditioning systems (1) Ventilation, air-conditioning and illumination equipment (0) Ventilators. Fans. Air-conditioners (2) Veterinary medicine (0) Vibration and shock with respect to human beings (0) Viticultural and wine-making equipment (0) Volumetric equipment and measurements (0) Walls. Partitions. Façades (1) Wastes in general (0) Water heating equipment (1) Water quality in general (0) Water supply systems (0) Waxes, bituminous materials and other petroleum products (1) Welded joints and welds (0) Welding consumables (3) Welding equipment (0) Welding processes (0) Welding, brazing and soldering (0) Welding, brazing and soldering in general (0) Wind turbine energy systems (1) Wires (1) Wires and symmetrical cables (0) Wood-based panels in general (1) Wood-protecting chemicals (0) Wood, sawlogs and sawn timber (1) Woodworking machines (0) Workplace atmospheres (0) Wound dressings and compresses (0) Writing and transliteration (0) Yarns (0)