Cell Phones on Airplanes
by Brian Dunning
Filed under General Science, Urban Legends
December 15, 2006
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Today we're going to fly up to 40,000 feet, flip open our cell phone, and call
the Twilight Zone to tell them we're doing something that's supposed to
be deadly dangerous.
I love Mythbusters and it's my whole family's favorite show, but with
their episode on the cell phone ban aboard aircraft, they did a disservice
to those of us who hope to get this groundless ban dropped. In case you missed
it, they did a test and concluded that cell phones can potentially interfere
with an aircraft's navigation system. The only
instrument they tested was a radio direction finder called a VOR,
which detects a radio beam coming from a ground station and points its direction.
In practice, VOR is on its way out, in favor of GPS. VOR stations are each
assigned a unique frequency in the VHF range between 108 MHz and 117.95 MHz,
which is right above the FM radio frequency range. By contrast, the lowest
frequency used by any US mobile telephones is 700 MHz; and in European mobile
telephones, 450 MHz. Since the frequencies are so incredibly different, the
whole debate is ended right there, for all practical purposes. Mythbusters
used an older VOR receiver that could be tuned to receive a much broader range
of frequencies, which is why they were able to detect the mobile phone signal.
To be more responsible, they should have admitted that this frequency was wildly
different than what any aircraft might possibly tune to. As it was, they left
viewers with an inaccurate, and alarmist, impression. Mythbusters called the
myth "plausible". No, it's really not plausible; a cell phone cannot affect
an aircraft's navigation instruments in the real world, and we'll have more
on that in a moment. Maybe if you threw a cell phone really hard at the GPS,
you could break something.
So this raises an obvious question: why aren't cell phone calls allowed on
airplanes, if there's no harm in it? The real reason has nothing to do with
the FAA; it comes from the FCC, the Federal Communications Commission. It has
nothing whatsoever to do with safety or security. When you're seven or eight
miles up in the air, your phone can hit any of hundreds of cell towers, and
there is supposition that this could cause a problem. As we know from 9/11,
cell phones work fine from the air, but nevertheless the FCC has enacted a
law making it illegal to operate a cell phone in a commercial plane that's
not touching the ground. I've used mine from general aviation aircraft on a
number of occasions and never had a problem either. A non-profit called RTCA
is the Federal Advisory Committee for the FAA, and their report finding that
cell phones pose no risk to aircraft safety is detailed in their report DO-235A, Assessment
of Radio Frequency Interference Relevant to the GNSS. The only law that
the FAA has is in support of the FCC law.
Boeing and Airbus routinely bombard their aircraft to harden them against
every conceivable type of attack, physical and electronic, certainly including
cell phone signals. If cell phones had the potential to endanger an aircraft,
you'd be allowed to bring them on board in the same way as you bring dynamite
on board. Meaning, not at all.
All other devices that you're not allowed to use during takeoff and landing
(PDA's, video games, iPods, laptops), are not restricted by either the FAA
or the FCC. You'll find the authority for this in RTCA document DO-233, Portable
Electronic Devices Carried on Board Aircraft. These rules are arbitrary
and are invented by the airlines, without any legal authority. It is their
plane and they're within their rights to make whatever rules they want, but
travelers should know that there are no laws against using these devices at
any time, and that the research has been conducted and the devices have been
demonstrated to be safe. Feel free to put this on the comment card next time
When you listen to the flight attendants explain the rules, it's clear that
their training includes a simple mention that portable electronics and cell
phones represent a danger. The trainers probably believe it and the flight
attendants have no reason to question what they've been told. If you've ever
wondered how your 1.5 volt LCD Palm Pilot could be so dangerous, you were on
the right track. When you hear something that sounds far fetched, be skeptical.
So what's the deal? Are Men in Black secretly going from airline boardroom
to boardroom, handing out corporate welfare payments in exchange for the promise
to support the government's evil plan to convince us all that we're on the
brink of destruction? Are there paranoid, over-cautious, or ignorant policymakers
in charge at all the airlines? Personally both of those are a little too conspiracy
theory for my taste, but I also think there might be a small element of truth
Take the example of the terrorist train bombing in Madrid in March of 2004.
The bombs were set off by cell phone calls, since cell phones are easy to get
and are reliable. One reaction, which thankfully has not been put in place
so far that I've seen, was the immediate proposal to jam cell phone signals
anywhere that was bombable. Airports, national monuments, stadiums, train stations.
Was this a logical reaction? No. If the bombers couldn't have used cell phones
they would have used walkie talkies from Radio Shack. If they couldn't have
used those they would have used mechanical wind-up clocks attached to detonators.
If they couldn't have used those, they would have used slow burning fuses.
There are a million ways to set off a bomb and no law can prevent it from happening.
Any reasonable person understands this. Unfortunately, our politically correct,
alarmist, liability hysterical culture demands that government do something.
The culture doesn't know or care whether it's logical, or makes any difference.
Our culture sleeps better knowing that Big Brother is babysitting. Satisfy
the public's emotions, and you have a happy population. I guarantee you that
Osama bin Laden is not rending his garments in despair over all his plans
being ruined, now that Americans aren't allowed to bring a bottle of water
on board a plane. It's a useless and inconvenient law, but it shows that government
cares, and our culture is willing to be walked all over and curtailed in any
way necessary to feel protected.
I think the cell phone ban on airplanes is just another example of this. Big
Brother has cultivated and nourished a supposed danger, and leveraged it into
another opportunity to babysit. Now I promise you that I'm not a conspiracy
theorist, and I'm not some paranoid anti-government guy who thinks
the government is out to get us. But I can't think of a better explanation
for the absurd inflight cell phone ban, than the one I've just given. If you
can, I welcome your comments on the web site.
By Brian Dunning
Please contact us with any corrections or feedback.
Cite this article:
Dunning, B. "Cell Phones on Airplanes." Skeptoid Podcast. Skeptoid Media,
15 Dec 2006. Web.
26 Nov 2015. <http://skeptoid.com/episodes/4014>
References & Further Reading
Elgan, Mike. "Why cell phones are still grounded." Computerworld.com. Computer World, 6 Apr. 2007. Web. 14 Dec. 2009. <http://www.computerworld.com/s/article/9015839/Why_cell_phones_are_still_grounded?taxonomyId=15&pageNumber=1>
Ely, J.J., Nguyen, T.X., Koppen, S.V., Salud, M.T. "Electromagnetic interference assessment of CDMA and GSM wireless phones to aircraft navigation radios." Proceedings of the 21st Digital Avionics Systems Conference. 10 Dec. 2002, Volume 2: 13E4-1- 13E4-13.
Heussner, K. "Why Can't We Use Cell Phones On Planes?" abcnews.go. ABC News Internet Ventures, 9 Feb. 2009. Web. 15 Nov. 2010. <http://abcnews.go.com/Technology/AheadoftheCurve/story?id=6833039&page=1>
Koski, O. "Why Can't You Use Cell Phones on Airplanes?" Scienceline. NYU Journalism, 8 Feb. 2010. Web. 15 Nov. 2010. <http://www.scienceline.org/2010/02/why-cant-you-use-cell-phones-on-airplanes/>
RTCA Committee SC-159. Assessment of Radio Frequency Interference Relevant to the GNSS L1 Frequency Band (DO-235B). Washington: RTCA, Inc., 2008.
RTCA Committee SC-177. Portable Electronic Devices Carried on Board Aircraft (DO-233). Washington: RTCA, Inc., 1996.
Thomas, Cyndi. "FCC TERMINATES PROCEEDING ON THE USE OF CELLULAR PHONES ONBOARD AIRCRAFT." FCC News. FCC.gov, 3 Apr. 2007. Web. 14 Dec. 2009. <http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-272051A1.pdf>
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