Word: preventjust
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Small electrical devices can similarly distorta plane's navigational instruments. To preventjust such electrical interference, the FAArequires all passengers to "turn off allcomputers, headsets, radios and telephones" duringtakeoff and landing. Although the energy radiatedby these devices is small, it can travel outwardto antennas mounted on the skin of the plane,causing serious interference in the aircraft'snavigational instruments and guidance systems...
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