AECMA PREN 3371-1994 Aerospace Series Electrical Bonding Technical Specification Edition P 1《航空航天系列.电焊技术标准.P1版》.pdf
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1、CEN PREN*3371 94 m 3404589 006222b 420 Edition approved for publication 1 994-0 1 -3 1 AECMA STANDARD NORME AECMA AECMA NORM C2 Chairman M. J. Le Cunff Comments should be sent within six months after the date of publication to AECMA Technopolis - 1 75, rue Jean-Jacques Rousseau 921 38 Issy-les-Mouli
2、neaux Cedex - FRANCE prEN 3371 Edition P 1 January 1994 EDITE PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : Descriptors : Srie arospatiale Mtallisation Spcification tech
3、nique ENGLISH VERSION Aerospace series Electrical bonding Technical specification Luft- und Raumfahrt Masseverbindung Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial).
4、It is published on green 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 th
5、at interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre INPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standar
6、d to CEN (European Committee for Standardization) for formal vote. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CEN PREN*337L 7Y 3404589 0062227 367
7、 Page 3 prEN 3371 : 1994 O Introduction This document has taken into consideration Stanag 3659. I Scope This standard defines the characteristics as well as the verification of bonding in on-board aircraft electrical systems. They refer basically to requirements relating to the effect of lightning,
8、return currents, electromagnetic interference, as well as to the accumulation of electrostatic charges and personnel shock hazard. This standard states the maximum permissible resistance values which guarantee, according to the installation, good conductivity of the whole of the structure, of the wh
9、ole installation and the bonding terminals; these values shall ensure correct operation of the systems. The rules of installation are defined in EN 3197. 2 Normative references EN 3197 Aerospace series - Installation of aircraft electrical and optical interconnection Stanag 3659 systems 1 Bonding an
10、d in-flight lightning protection for aircraft 2, 3 Terminology Chassis : represents the whole of the metallic parts electrically connected to each other, of a support or piece of equipment whose potential generally represents the reference potential (earth “O“ volt). Bonding : process of connecting
11、together metal parts so that they make low resistance electrical contact for direct current and low frequency alternating current. NOTE : necessary for getting a low resistant electrical current path. Grounding : the bonding of an equipment case, frame or chassis to an object or vehicle structure to
12、 ensure common potential. NOTE : necessary for getting a common potential, also for keeping up a common potential at a high electrical fault - or lightning strike caused - current by the means of low grounding resistant electrical current path which are equal to means for bonding. 1) Published as AE
13、CMA Prestandard at the date of publication of this standard 2) Published by : NATO, Military Agency for Standardization (MAS), BI 1 1 O BRUSSELS. Previous page is blank Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo
14、reproduction or networking permitted without license from IHS-,-,-CEN PRENt3371 94 D 3404589 O062228 2T3 D Page 4 prEN 3371 : 1994 Earthing : the process of making a satisfactory electrical connection between structure, including the metal skin of an object or vehicle at the mass of earth to ensure
15、a common potential with the earth. NOTE : necessary for getting a common potential of the earth. Equipotential connection : an electrical connection which feeds the same potential to the elements of power production in addition to the other parts. Category I or II : the category I or II is determine
16、d by a common agreement between the aircraft manufacturer and the Official Services. 4 Primary bonding They comprise the whole of the conducting parts of the structure, of bonding parts and conductors which can be traversed by considerable energy (lightning discharge currents). 4.1 Main structure Th
17、e assemblies forming the structures are generally good conductors and allow the discharge of static charges and lightning currents. The structures are generally used as a return current path for the sum of the currents of the on-board electrical installation (for example : under a current of 300 A i
18、t is usual to measure resistance from 0,2 mR to 2 mR between two points about 30 m apart. 4.2 Detachable parts In principle, parts (non-articulated access doors, for example) attached by a significant number of metallic screws shall ensure good electrical continuity and shall not require the additio
19、n of bond braids. The metallic parts attached by quarter turn screws are bonded by suitable methods (braids, contact arms, interposition of conducting materials, etc.). 4.3 Articulated parts Parts which are articulated and placed permanently or temporarily on the exterior of the aircraft such as con
20、trol surfaces, doors, hatches, gear legs shall be correctly bonded, taking the following two points into consideration : - the articulation can be, by its construction, made sufficiently conductive even if it is lubricated, provided that the contact pressure is sufficient; - the articulation is not
21、conductive by the nature of its materials or protection used. In this instance, it is advisable to ensure bonding by a number of bond braids, ensuring redundancy and with the shortest possible length arranged so as to avoid any loop or risk of jamming during operation or by suitable means. Copyright
22、 Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CEN PRENx3371 74 m 3404587 0062227 L3T m Page 5 prEN 3371 : 1994 4.4 Fuel tank covers and holes The design of th
23、e tank covers shall be such that there is no danger of inflammation of vapour, should lightning strike these covers directly. The refuelling and drainage holes, and air vents shall be carefully bonded. 4.5 Engines and auxiliary starter unit The main articulated attachments for the cooling system and
24、/or ball joints shall be shunted by a braid, unless the electrical continuity between engine and structure is permanently ensured by fixed attachment points. The fixed or moveable pipes shall also be bonded in relation to the jet engine either by construction or braids. 4.6 Non-metallic external par
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