FAA To Allow Use of Most Electronic Devices Throughout Flights
alstor writes "As previously expected, the FAA has announced that most portable electronic devices may be used throughout the duration of a flight. Mobile phones may still only be used in airplane mode without cellular service."
Now you'll be able to read your kindle on the plane, but you still won't have to put up with the passenger next to you carrying on a loud phone conversation (save, maybe voip?).
Like the war on water, it's largely been about control and government rules abetting private interests. I suppose in this case airlines and the faa and whoever the fuck else stands to make a buck off of this realized it is more profitable to let the monkeys paw their gadgets 100% of the time, instead of the usual 96%.
Given that aircraft fly around in a veritable EM soup (AM, FM, VHF transmission towers, the spark gaps of an angry god, etc.), I would hope that every phone on the plane draining its battery in a coordinated RF scream would be a survivable event. Whether all the chatter raises the noise floor or introduces errors into sensitive measurements is a subtler but more likely issue.
How exactly does this differ from the policies from now? Airplane-mode only, check. Turned off during take-off and landing, check.
Uncheck. On for take-off and landings, except for special cases when visibility is low and the low visibility navigation systems are not PED certified.
Wi-fi allowed (if you want to pay the airline $20 for a couple hours' access), check.
Uncheck. Wi-fi and bluetooth allowed, with no requirement to pay the airline. I figure it will be interesting to run an open NAP and see how much data can be sniffed from devices trying to get a wi-fi connection. Or to spoof a lot of large online services to get login credentials. Fun.
Where's the big change?
Actually I think it's more to do with the fact that old PCN & GSM phones gave off quite a bit of interference
Which caused precisely zero plane crashes.
Most phones these days hardly use those spectrums and anyway you've still got keep the phone in flight mode.
Not for any evidence based reason. There are social reasons to not allow cell phones (annoys your fellow passengers when you talk loudly) but thousands of phones are turned on every single day in airplanes for the entire duration of the flight (both intentionally and not) and there has not been a single accident ever as a result. If it were actually a safety risk then the ONLY effective solution would be to ban cell phones entirely from the plane. Based on the fact they haven't done this it is not a risk factor and the FAA knows it.
If you'll please pay attention to our safety demonstration and procedures speech...
You mean the one where they explain how to use a seatbelt for everyone who hasn't been in a car in the last 40 years?
I like to use this ABM1 - Passive Air Band Monitor when flying. I keep it discreet as I'm sure most flight crews won't understand how it's different from a typical radio receiver. I regularly hear that "bzz bzz bzz" of cell phones with this device. I then ask my girlfriend sitting next to me if she put her phone in airplane mode. If she hadn't and does it the noise usually goes away. If she had her's in airplane mode then I assume it's someone else sitting near me. Phones do cause interference in the aircraft frequency bands (at least at short range).
there is no way you will get a connection to a tower at 35000 feet moving at 500mph
Yes you can. If you will recall, this was proven on 9/11/2001.
The prohibition on using cell phones was also at the request of the wireless carriers. The cellular system was not designed to handle someone using their phone at 35,000 fett and traveling at 500 mph. Your phone "sees" way too many towers and yet the towers have to hand off rapidly since you move out of coverage really fast at that speed. Seven miles up in an airplane is not that far from a tower and the signal is excellent.
It's easier to "just say no" than it is to re-engineer the cellular network to also work with people using their phones in airplanes. Besides, the airlines want you to use their skyphone at their rates so it's in their interest to keep you from using your cell phone instead.
Cheers,
Dave
They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty.
Ben
Given that aircraft fly around in a veritable EM soup (AM, FM, VHF transmission towers, the spark gaps of an angry god, etc.), I would hope that every phone on the plane draining its battery in a coordinated RF scream would be a survivable event. Whether all the chatter raises the noise floor or introduces errors into sensitive measurements is a subtler but more likely issue.
What is outside the airplane is the least of the problems. A large commercial plane has racks of electronic equipment, dozens of radios, weather radar, flight displays, in-flight entertainment systems, power generation and distribution systems, pumps, servos,...etc.
All of those are potential sources of EMI that need to work together as a system. The only reason a cell phone is considered 'risky' is because it un-tested. There is nothing unique about cell phone electronics from an avionics point of view. Similar, and more powerful, systems are already integrated into the airframe.
I like to use this ABM1 - Passive Air Band Monitor when flying. I keep it discreet as I'm sure most flight crews won't understand how it's different from a typical radio receiver. I regularly hear that "bzz bzz bzz" of cell phones with this device. I then ask my girlfriend sitting next to me if she put her phone in airplane mode. If she hadn't and does it the noise usually goes away. If she had her's in airplane mode then I assume it's someone else sitting near me.
Correct so far.
Phones do cause interference in the aircraft frequency bands (at least at short range).
And... you go off the rails.
GSM phones cause interference in audio-frequency circuits because the phone transmits in regular bursts every 4.62 ms (this is why it doesn't affect CDMA, UMTS, etc., only 2G GSM/GPRS/EDGE, because they use TDMA). It turns out audio amplifiers generally tend to serve as decent wide-band AM receivers, so this is very easily picked up as a 217Hz buzz. However, this is all happening on the audio-frequency side, so calling it "interference in the aircraft frequency bands" is just plain wrong -- it will affect practically any unshielded or insufficiently-shielded device (it's only a couple watts or so transmitter, but within a meter or less the inverse-square law says you do need better shielding than a lot of consumer electronics have) with an amplified audio output, including all sorts of radios, and non-radio devices from MP3 players to cassette players.
(for more on this, google or start here)
Fortunately, it's a really easy problem to solve -- just keep your phone out of the cockpit. Thanks to the inverse-square law, it's really only a practical issue at very short range.
And they were using cell phones.
Most of the 9/11 calls were from Airfones, not cell phones -
http://imgs.sfgate.com/blogs/images/sfgate/cmcginnis/2010/12/16/airfone250x187.jpg
Airfones have mostly gone away, but a dozen years ago they were pretty common.
When I notice my fellow passengers playing Candy Crush on their phones you can plainly see the NO SERVICE displayed on the top. This is because they don't know how to go into Airplane Mode so their radios are on, but the phone can't lock to a tower at 35K feet travelling at a ground speed of 500 mph.