What is BS EN 3371 - Verification of bonding about ?  
BS EN 3371 specifies the characteristics as well as the verification of bonding in on-board aircraft electrical systems.
They refer to requirements relating to the effect of lightning, return currents, electromagnetic interference, as well as to the accumulation of electrostatic charges and personnel shock hazards.
BS EN 3371 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.
Who is BS EN 3371 - Verification of bonding for ? 
BS EN 3371 on the verification of bonding is useful for: 
- Aerospace avionic electrical and fibre optic technology
- Aircraft electrical systems
- Spacecraft and space products manufacturers 
- Aerospace and defence industries 
- Design engineers for aircraft products
- Quality control personnel for aircraft products 
Why should you use BS EN 3371 - Verification of bonding ?
Bonding is a process of connecting metal parts so that they make low resistance electrical contact for direct current and low frequency alternating currents. Earthing is 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 a common potential with the earth.
The guidelines provided in BS EN 3371 helps the quality control personnel with the use of measurement methods and bonding resistance, earthing, and grounding of electrical connection.
BS EN 3371 is structured such that the necessary level of quality is achieved, consistently maintained, and the high reliability of the product assured. By adopting BS EN 3371, you can demonstrate the reliability of your products and build trust in its use throughout the aerospace supply chain.
