|Quoting Kaddyuk (Reply 3):|
The problem is that this signal could interfere with certain aircraft systems. However, aircraft should be protected against this type of interference because they fly through areas of intense interference at times.
Even using cellular devices without flight mode isn't dangerous as such. But better be safe than sorry...
|Quoting ThirtyEcho (Reply 5):|
Once again, cell users, the interior of an aircraft fuselage forms what is known as a Faraday Cage; in this structure, electronic devices transmit signals that bounce around within the confines of the fuselage and shift frequency as they bounce. There is no way to anticipate or predict how these spurious signals will manifest themselves. Your primary transmission might be perfectly benign but the second or third shift might mask an ILS signal, block a VOR signal or send an autopilot off chasing a phantom radial.
|Quoting Captjetblast (Reply 12):|
There's no way to interfere with systems on board, the frequencies in use in air navigation are pretty far from the ones in use by cell phones systems.
|Quoting Captjetblast (Reply 12):
When on a plane they tell you to turn your cell phones off, that's because once in the air, say, at 3000 ft and at the speed of the aircraft, your phone, better said, hundreds of mobile phones in the air, will hold and quit quickly from one ground antenna to another, so the mobile phones system on the ground will get crazy and collapse. Sometimes more than one antenna will be able to pick your phone, or maybe your phone will pick more than one antenna. At higher altitudes, there'll be no problem, your phones will be dead, with no contact with ground.
|Quoting Captjetblast (Reply 15):|
As for the interference: cell phones frequencies ara well far beyond those in use in an aircraft: 900-1000 MHz vs. 108-132 MHz, even considering armonics, which in turn loose power as they depart from central frequency. And the power of broadcast of the aircraft systems are powerful enough to make the tiny power of your cells seem nonsense. For the contrary, the ground cell networks broadcast are powerful, but not enough to doom a plane (it simply didn't happend).
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