Do you really expect anyone to take your comment seriously?! The amount of RF being emitted by a cell phone in airplane mode is so minuscule compared to the amount of RF blasting all over the skies anyway that any plane so at risk should never be allowed to fly, not to mention there would be no altitude at which it would be safe to operate any electronic device.
Bluntly put, you and the others in this thread who say "I'll do what I want" are as ignorant as the Senator.
I was in Electronic Warfare. I've participated in TEMPEST actions both offensive and defensive. As an electronic designer, I've also been through FCC certifications... and boy is there a lot of interference possible.
An airplane hull is a Faraday cage. Outside signals are blocked from coming in, which is why airplanes have external antennas, it's why a GPS or radio doesn't work unless you're close to a window, and it's why your comment about RF blasting all over the skies outside the airplane is meaningless.
What matters is RF echoing around INSIDE the hull. That's what has to be designed and tested for. It's why the few planes with onboard WiFi have a tiny limit on power output, to try to hold down the interference. However, as Boeing accidentally (and luckily) found out, some devices don't follow the power rules and can overwhelm the pilot's instruments, which naturally were never designed for
internal interference like that. (see Faraday cage above)
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Moreover, all you seem to think about is yourself. "How could my little device cause any harm?" Did it ever occur to you that if a hundred others are doing the same thing, the effects are greatly magnified?
If someone is seated just right, their cell signal will go through the floor to the electronic cabling, and can cause interference to nav signals, voice comms or other aircraft control systems.
There are airline pilot reports that someone turning on a cell phone has probably caused false TCAS commands. Do you know what that is? It's a virtually mandatory command to the pilots to climb or dive to avoid collisions. Very dangerous while landing or taking off. There are also reports that autopilots have disengaged near landing, probably for the same reason. Not to mention the complaints about GSM buzz interfering with ATC communications. We've been lucky so far that pilots have gotten around these unnecessary distractions.
The upshot is, until the pilot cabin is fully shielded, and until all the controls on the plane use fiber optics which are not susceptible to RF, common sense is to err on the side of safety.
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Again, the FAA is not a safety organization like the NTSB. The FAA promotes flying, and in the past have done things like ignore the NTSB's calls for cargo hold fire supression systems, mostly because of carrier complaints about cost. Never mind those who died horribly in fiery crashes... because they're rare.