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When we refuel aircraft we have to:
1. Earth the aeroplane by attaching an earthing wire to a metal part of the aircraft.
2. Earth the refuelling nozzle by attaching another wire to the aircraft before allowing the nozzle to contact the aircraft.
The issue regarding mobile phones I believe is the small possibility of dropping the phone, having the battery become detached from the phone and the terminals on the battery shorting on something.
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