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Wireless Computing and Airplanes?
Echemus writes "The Register has an article speculating whether the fact more and more devices have WiFi/GSM facilities built in will cause Airlines to ban all computing equipment and its like from the cabin. Airlines are ultra-paranoid about cell phones, but is that paranoia justified?"
As far as WiFi goes, it seems like the airline industry is already planning on providing WiFi internet access on the plane. See this Yahoo business article. cached by Google.
Relevant quote:
And travelers may soon get WiFi while on the airplane, if recent trials in Europe and the United States are successful
If Happy Fun Ball begins to smoke, get away immediately. Seek shelter and cover head.
Airlines are not afraid of cellphones -- the FCC is. Cellphones work because they can hit a handful of cells, which decide between them which cell to use to handle the phone's traffic. A cellphone in the air can hit dozens (over Los Angeles, hundreds) of cells at once, causing the cell system to melt down.
...phil
"For a list of the ways which technology has failed to improve our quality of life, press 3."
There is no way in hell I am going to check a laptop. Last year, one of the baggage handlers at LAX broke open my bag and stole some stuff out of it. American Airlines basically told me "Too bad."
" ...But has anyone actually gotten a signal while flying around in one of those big tin cans? "
Sure...at least on a Blackberry device. Usually if you're sitting by the window, and are over a LARGE city (i.e. there are LOTS of towers below you), you can get enough of a signal to send/receive messages. Darn thing's gotta be up in the window, though! This happens even at altitude...20,000 feet +.
AFAIUI, radio spectrum is supposed to be allocated in such a way that interference does not affect critical bands. There's a regulatory body to do it. In the past, before this became an issue, there were a lot of electronic gadgets that produced quite large broadband interference. Look at early home computers with plastic cases - you could get several volts of signal from some of them just by holding an oscilloscope probe over the case. Then people starting using serious shielding so that only the wanted frequencies got out.
The actual signal levels from Bluetooth, 802.11 etc. are all pretty low and they are in standards-designated bands.
So exactly what is the issue? Does it have, as I suspect, a lot more to do with the convenience of the cabin crew and the airline than the passengers?
Aircraft survive lightning strike. They are locked onto by powerful radar stations. They have transmitters many times more powerful than cell phones. But, seemingly, all terrorists need to do is to keep their cellphones turned on. doh.
Panurge has posted for the last time. Thanks for the positive moderations.
Forget the background science, forget the RF engineering, and forget the fact that the pilots and managers creating these policies no absolutely nothing about RF/microwave princples.....consider layman logic and basic engineering principles.
Do you REALLY think, the achilles heel of aircraft made in the last 40 years (little lone last 20) is that turning on a cell phone or wifi card (with only the mW's of power)will interfere with the navigation systems or possibly down the plane? Give me a break. Those creating these regulations should put down their pens and close their mouths and try picking up a book.
Aircraft systems have countless safety factors designed in, and extensive RF shielding around critical systems (i.e. nav, comm, control etc.). The common radio, TV, cell tower would have a far greater impact on interferance than a lower power transmitter on board ever would, and we don't see them re-routing planes around those towers (even on landing or take off) do we? Why? Because it's NOT a problem and never was.
Dear lord.....may the ignorance stop one day....
Rich...
It is pretty obvious that the use of cell phones on planes is possible, without adverse effects on the airplane. Maybe there is some trouble with the ground stations, as a previous poster pointed out, but do you know who else bans cell phones? Greyhound and the other bus lines, and they don't pretend there is a technical reason for it.
Can you imagine being on a plane full of people talking on their phones non-stop? Or even just having to sit next to someone gossiping their head off for an entire 3 hour flight?
The airlines ban cell phones for the comfort of their passengers, and I'm glad they do.
I've been on a plane that was trying to land and someone used their cell phone. It was a very bumpy ride. The pilot came on and said "Someone was using their cell phone on that landing, if I find out who it is, they will be reported to the police."
Newer planes use shielded wires, so are not affected by the phone's signal, however older planes or planes with corroded shielding are suseptable to cell phones causing interferance - which can cause catestrophic results (immagine if the interferance was interpereted as a signal to put the flaps full up!). Its like when your cell phone rings when you're playing music, you hear the interferance through the speakers.
So if the airlines want to upgrade their fleet to be cell-phone proof, then no, its not necessary, and they could offer wireless internet on the plane. However with pretty much all airlines now taking a major economic hit after 9/11, they arent about to spend the kind of money that would be needed to upgrade their fleet, and are more likely to just ban computers.
I'm at a loss as to how a comment this absurd could be modded to insightful.
IF wifi and other broadcast devices are deemed dangerous because of interference, then they need to be completely banned from the cockpit.
Suggesting it now falls upon a crew who should be flying the plane to scan for wireless devices is ridiculous.
Say I leave my 'puter off until I'm onboard and the flight is underway. Do you expect them to do constant scanning, and then devote crew time (or flight attendant time, as if these folks are already stretched serviing an entire flight deck of people) to search for WHICH seat is broadcasting? Then, if I've put my computer back in the bag but left it on, they have to do a bag and pocket search in a limited area to try to determine WHAT device (cell phone, blue tooth, wifi laptop, PDA) is sending the signal out, then turn it off?
Come on mods. Use half a brain.
IF this stuff is truly interefering then there is NO reason to allow people to carry it onto the plane with them. Let the few people who think they deserve special treatment or have documents that need to be in their possesion at all times charter their own flight.
Unfortunately this is a rehash of old news. The fact that Mobiles, PDAs and Laptops *can* cause interference has been widely known for a long time. Anyone that has flown in the last 5 years will be familiar with the warning to turn off these devices on take off and landing. The possible Ban on laptops etc relate to the introduction of 'ultrawideband' capabilities for these devices which 'could affect a plane's electronics, including its instrument landing system and its collision avoidance systems'. Ultrawideband devices are expected to hit the stores this year, and will range from laptops to PDAs to the following military applications: Since Aircrew will not be able to tell the difference between UWB devices and regular laptops, it seems that a blanket ban may be applied. A good overview of Ultrawideband and its political consiquenses can be found here An article on Ultrawideband and its effects on aeroplanes can be found here
A CD player affecting modern avionics? Oh, please...
I'm an electronics engineering tech, and I used to work for Boeing. I've seen how the 'black boxes' are put together, and how they're installed in the jets. They're heavily shielded against stray interference, both by their own grounded metal housing and by the fact that every single non-coaxial wire going into the thing goes through at least a bypass capacitor, if not the cap and a ferrite bead, before it ever hits its destination.
Don't even get me started on how many of those wire bundles have shield braid over the inner conductors.
Couple that with the fact that there's a solid metal floor between the 'people' area and the avionics bay, AND the fact that the boxes are all mounted in a grounded rack, and I have a lot of trouble believing that a CD player could so much as create an electronic hiccup in anything more than the headphones of the person using it. If it did, then there was something seriously wrong with the plane's avionics to begin with.
Show me independently-verified lab results that a CD player (or anything else in the cellphone or PDA category) can freak out fully functional and properly installed avionics, and I will cheerfully STFU. Until then, I would consider such a story to be in the same category as the Weekly World News reporting that Edgar Cayce had been reincarnated as a psychic fly.
Bruce Lane, KC7GR,
Blue Feather Technologies
SkyPhone, and the related private pilot versions use a different network -- the antennas are fewer and are pointed upward. Cell towers on the ground negotiate which one is going to handle your traffic -- and when you're cruising along at 300+ mph you're moving between normal cells at a good clip.
Furthermore, ever notice how a cellphone disrupts your monitor or your speakers on your desktop?
As a pilot you WANT the guys up front to have a crystal clear communication -- hell buzzing around the shoreview towers in minneapolis cause the radios to go wonky, so what do i know?
Old age and treachery almost always overcome youth and skill.
Here's the straight scoop. As the article says, airline people can't tell if your radio/phone/computer are transmitting any RF, let alone bad RF. Maybe a special FCC approval stamp on each device to OK it for airline use? It's not even near practical for the airlines to inspect all our gadgets before we get on the plane. And what if I *made my own gadget* (don't laugh, many HAMs still make their own radios)? I don't know nearly enough about EMI/RFI shielding and proper design techniques to insure that any gadget I make won't bring down a plane.
Yep, we're lookin at an nearly complete ban, unless the airplane manufacturers can certify their design to be EMI/RFI proof.
Cell phones are only banned so the airlines can charge you a ridiculous amount of money to use the stupid sky phone. It's such a scam.
Actually, both the FCC and FAA ban cell-phones in flight, but for different reasons:
1: FCC bans cell phones in flight because the altitude and speed of an airplane would cause the cell phone to be reserving bandwidth on many cells, thus vastly diminishing capacity. Also depending on the anti-fraud measures in place, it may prevent the cell phone companies from charging (depends on how sensitive the sanity checking is). The billing problem could be easily solved, but the capacity problem is inherent to the system.
2: FAA bans cell phones because of the remote *possibility* of frequency leakage off the devices which could interfere with the communications systems of the aircraft. If you have ever seen an electric shaver interfere with your FM radio, you know what I mean. For good reason, the FAA tends to be very paranoid about these things.
LedgerSMB: Open source Accounting/ERP
Things are becoming increasingly complex these days. Manufacturers get a kick out of combing pointless things these days - wait for a 802.11g toothbrush etc.
Training the cabin staff, searching all passengers and risking putting off the punters is a bad move for the airlines.
The only viable route is to approach it from the other end.
Aircraft should be designed and/or modified to ensure that this cannot become a problem. how difficult can it be, given the obstacles that have already been overcome in the field of aviation?
"Those who cast the votes decide nothing; those who count the votes decide everything." (attrib. Joseph Stalin)
Well, if you're so smart, you've porbably also seen that gosh golly gee, those avionics are quite often attached to (gasp!) antennas for picking up (gasp!) radio transmissions.
Pilots are cautious for a reason- the FCC's testing of devices is not sufficient for close-range use with avionics. My father(a pilot, small single engine planes) explained it quite simply. He have no idea if a laptop will cause any of the avionics to malfunction. Maybe it doesn't...but say maybe it causes the VHF direction finder to go a little askew. After an couple hour's flight time, you find yourself way off course. Given that planes just can't pull over to gas up, getting off-course can be a major problem.
Show me independently-verified lab results that a CD player (or anything else in the cellphone or PDA category) can freak out fully functional and properly installed avionics, and I will cheerfully STFU
Oh, I see, devices "will not cause interference unless proven otherwise"? Unlike our legal system, everything that goes into a plane has to PROVE it meets FAA standards. We don't just throw shit into an airplane's equipment 'roster' and then wait for some "independent lab" to test them.
The problem is three-fold: a)you have no idea what's going to come onto the plane. There are hundreds of thousands of different electronic devices. b)you have no idea what avionics systems are in the plane c)you have no idea how the device will get used(and RF emissions from a laptop alone can vary on processor/ram activity, screen brightness, peripheral activity...) d)nobody has done even basic studies to see what general kinds of equipment cause interference.
Please help metamoderate.
here is the boeing line of how interference causes "anomalous events" during flights.
In all our testing, the FAA took the view that it was not their responsibility to prove that something was unsafe - it's the manufacturer's responsibility to prove that their product isn't. This is the real reason airlines are so paraniod about cellphones, etc. Unless Nokia spends $500K+ per model to certify that there's absolutely no way the device can produce interference even in a failure mode (and provides every consumer with an embossed certificate to that effect), your flight attendant will be asking you politlely to shut the thing off.
There is, of course, always the possibility of a sea change. Perhaps the manufacturers will begin doing real testing of their devices for EMI, although that will increase costs (although much less than for IFE equipment because the volume would be higher). However, that would have to happen on every device manufactured anywhere and require the user to show some kind of certification to the airline. Perhaps the FAA will require even better shielding on critcal equipment, but that implies retrofitting every piece of equipment on every commercial aircraft in the world. Or maybe the FAA will simply come under political pressure to relax their safety requirements, but that will end the second a plane goes down for any non-obvious reason and a herd of lawyers appears screaming "I told you so!"
Unless there is a paradigm shift on one of these fronts (none of which are really palatable), you will see more and more restrictive policies on the use of consumer electronics in the cabin.
Until then? Simple. Leave your laptop powered off and read a book. Maybe you'll learn something...
PS - A pretty amusing cartoon appeared in the New Yorker peripherally related to this topic once. Check it out here.
"Prepare for the worst - hope for the best."
I used to think that it was all imaginary, too. Then I heard about supposed incidents, and then I read an article about 69,000 logged "incidents" (as of 1996) in IEEE Spectrum.
t ur es/air1.html
http://www.spectrum.ieee.org/spectrum/sep96/fea
---
A report selected from the ASRS database illustrates
this type of incident. In March 1993, a large
passenger aircraft was at cruise altitude just outside
the DallasFort Worth International Airport when the
No. 1 compass suddenly precessed 10 degrees to the
right. The first flight attendant was asked to check
whether any passengers were operating electronic
devices. She said that a passenger in seat X had just
turned on his laptop computer.
The report continues: "I asked that the passenger turn
off his laptop computer for a period of 10 minutes,
which he did. I then slaved the No. 1 compass, and it
returned to normal operation for the 10 minute period.
I then asked that the passenger turn on his computer
once again. The No. 1 compass immediately precessed 8
degrees to the right. The computer was then turned off
for a 30-minute period during which the No. 1 compass
operation was verified as normal."
The report states that it was evident to all on the
flight deck that the operation of the laptop computer
was adversely affecting the operation of the No. 1
compass. It concludes: "I believe that the operation
of all passenger-operated electronic devices should be
prohibited on airlines until the safe operation of all
of these devices can be verified."
---
I flew on Korean Air once. They banned the use of portable CD players, but it was ok to use a laptop with a cd rom drive. I used my cd player anyway; you can only get drunk and pass out for so long on a 12 or 15 hour flight (Korea to NY, direct). Don't exactly remember how long it was...