Potential hazards of charging by friction 1. Fuelling a plane with highly flammable high octane aviation fuel. The friction between the fuel and the pile and between the rubber fuel pipe and the drum as well as between the tyres of the refuelling truck could lead to a build up of charge. The truck, pipe and fuel delivery system are all earthed. 2. Cars get charged up and you can get a spark from them when getting out. This is due to friction between the tyres and the road. It can be prevented by small rubber strip with a centrepiece of metal fixed to the back of the car which rubs on the road and so discharges the car.
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