To prevent interference with the flight deck communication system, regulatory authorities have banned certain electronic devices from being used on aircraft, at any time. Passengers may be allowed to use certain devices on the aircraft at specific times. Airlines sometimes publish their electronic device policy in the in-flight magazine. Incidents of flight deck communication system interference, caused from passenger electronic equipment, must be reported to the regulatory authority.
To ensure passenger compliance with regulations, most airlines advise passengers to turn off all electronic devices as the aircraft door is about to be closed. After take off, passengers may be told which devices can be operated during flight. Once descent for landing has started, passengers are advised to turn “off” electronic devices.
Over a number of years, regulatory authorities have received reports from airlines about interference attributed to cellular phones. Recent research, carried out by the UK Civil Aviation Authority Safety Research Group, has shown that cellular phones used on an aircraft will produce interference that exceeds the certification levels for some aircraft equipment. Further research is to be conducted to determine more precisely the effects of the transmissions on aircraft equipment.
In the meantime, for safety reasons, cellular telephones must remain in the “OFF” position while aircraft engines are running.