Earthing
in aircraft
In the case of an aeroplane, the
structure is likely to become charged during flight. Airport procedures include
earthing the plane upon arrival, by attaching an earthing cable to the fitting
provided on the aircraft. This conductor returns the aircraft to local earth
potential and discharges any accumulated static charges, an important
consideration prior to refueling activities
A controlled earthing system with
monitoring facilities from remote operation can be implemented. So in this
situation one can use the earthing system with a Zenner barrier and after the
complete discharge of accumulated charges on the aeroplane a permissive signal
can be send to the system to the operator on the control system to proceed with
the refueling activities as applicable.
Same system is used in discharging
the mobile equipments in the Hazardous areas in the Petrochemical and refinery
complexes where hydrocarbon may be present and chances of fire.
Inside the aeroplane during the flight there is an
intermediate insulation barrier which restricts the accumulation of
charge/static electricity. So no need earthing from inside of the aeroplane for
the static electricity.
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