It was an excuse to try and force people to pay attention while some basic rules were explained and keep people alert in the more dangerous times of the process
if wifi is, then what about voice calls over Skype
In some instances of low visibility – about one percent of flights – some landing systems may not be proved PED tolerant, so you may be asked to turn off your device.
CRJ200 First Officer reports compass system malfunctions during initial climb. When passengers are asked to verify that all electronic devices are turned off the compass system returns to normal.
IN AN APPARENT PED INTERFERENCE EVENT, A PAX'S PORTABLE GARMIN GPS MODEL NUVI 660 ALLEGEDLY INTEFERED WITH A B737 CLASSIC'S (NO GLASS) DME NAVIGATION UPDATE FUNCTION.
FLT CREW OF CRJ-700 RPTS THAT AURAL INTERFERENCE IN VHF COMS CEASED WHEN PAX WERE ASKED TO ENSURE ALL FORMS OF 2-WAY COMS WERE TURNED OFF.
“Prior to the existence of handheld devices like smart phones and other personal electronic devices (PEDs), there were portable AM and FM radios, even portable televisions,” says Prof. Tim Wilson, chair of Electrical Engineering at Embry-Riddle Aeronautical University in Daytona Beach, Fla.
“The signal processing in those devices,” he says, “emits radio-frequency signals which (1) could be in the band used by aircraft communication and navigation devices, and (2) even if out of the bands used by communication and navigation devices, would appear to those communication and navigation devices as noise.”
In nearly all cases these signals were also considerably lower than those from other nearby sources of RF energy, including cellular telephone base stations.
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