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BS EN 3371:2019

BS EN 3371:2019

$102.76

Aerospace series. Electrical bonding. Technical specification

Published By Publication Date Number of Pages
BSI 2019 20
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This document specifies 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, 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 whole installation and the bonding terminals; these values shall ensure correct operation of the systems. The rules of installation are defined in EN 3197.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Introduction
1 Scope
2 Normative references
3 Terms and definitions
7 4 Primary bonding
4.1 Main structure
8 4.2 Detachable parts
4.3 Articulated parts
4.4 Fuel tank covers and holes
4.5 Engines and auxiliary starter unit
4.6 Non-metallic external parts
4.7 External protruding parts
4.7.1 Internal metallic parts protruding on the exterior of the aircraft (Pitot tube, drain, for example) shall be bonded to the structure at a point situated as close as possible on the aircraft skin.
4.7.2 Protruding parts connected to the on-board electrical circuit (sensors – Pitot tubes)
9 4.8 Ground connections
5 Secondary bonding
5.1 Return of electrical currents by the structure
5.2 Grounding to avoid danger of electrical shock
5.3 Discharge of electrostatic charges
10 5.3.1 Fuel circuit
5.3.2 Hydraulic circuits
5.3.3 Flight controls and various mechanical controls
5.3.3.1 Pressurized area
5.3.3.2 Non – pressurized area
11 5.3.4 Air conditioning, pneumatic and airspeed circuits
5.3.5 Oxygen circuit
5.3.6 External surface of the aircraft
5.4 Equipment grounding to avoid interferences
5.4.1 Equipment fitted in bays or on racks
5.4.2 Miscellaneous components
6 Measurement methods and bonding resistance limits
12 6.1 Primary bonding measurements
14 6.2 Measurement of secondary bondings
6.2.1 Return of main currents to aircraft structure
15 6.2.2 Return of non-main currents to the aircraft structure
7 Measurements relative to the discharge of electrostatic charges
18 8 Measurements relative to various bondings
8.1 Surface resistance of antistatic treated surfaces
8.2 Base of static dischargers
19 8.3 Earthing of the aircraft

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BS EN 3371:2019
$102.76