US Senator fights for the right to use the iPad from takeoff to landing

Discussion in 'Apple iPad News' started by RaduTyrsina, Mar 10, 2013.

  1. miket5au

    miket5au
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    There is zero chance of emissions from mobile devices affecting an aircraft. However it is obvious from the responses here that a lot of people still believe it is. We all watch too many Movies. There are lots of shows that show what really happens. Mythbusters does a fairly good job most of the time - big exception is the Lie Detector episode (the Lie detector machine is bogus - the operator is the one deciding if you are lying).

    One reason that you are not supposed to use an iPod (and it was walkmen before that) before takeoff is that they want you to pay attention to the warning / instructional videos and air safety announcements. Originally the emissions from mobile devices were feared to interfere with communications but that has been proven long ago to be a baseless fear.

    Do you think 300 mobile phones in an aircraft which is on the ground, then taxi-ing for takeoff, then taking off and so on are emitting as much interference as the signals from the mobile towers and all the other sources of radiation and radio waves that are outside the aircraft? How about all the TV screen and entertainment systems in modern aircraft? Your mobile / tablet / MP3 player will not even register a blip. I bet less than half the people on a plane even put their phones into aircraft mode (or even know how to).
     
  2. AQ_OC

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    Boy....Mythbusters is the best you can do? :)

    Mobile phones on aircraft - Wikipedia, the free encyclopedia

    Not all electronics emit energy at the same frequencies, so you cannot compare TV and entertainment systems (which are off during take off anyway) to phones or other devices that use wifi, cellular and bluetooth radios.

    The field of unintentional upset of electronic devices and systems is an area of active research. It's a hard thing to get a grasp on because the conditions will may result in upset may not always exist at any given time. And just because people don't know how to use airplane mode is no reason to set policy. Nor it is a reason to ignore it. You are not asked to put your phone in airplane mode, you are asked to turn if off during takeoff and landing.
     
  3. fb si

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    Romney was cracking a joke. The media just ran with it and made it look like he was being serious.
     
  4. cwinter

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    Boy, stop watching Mythbusters. They're not professionals, you know?

    The FCC mandated maximum transmission power of mobiles phones is restricted to 200 mW. This corresponds to 23 dBm. Every doubling of the user-base will raise the dBm maximum emissions by 3 dB. Hence, for 1 user it is 23 dBm, 2 users 26, 4 users 29 and so on. 256 users corresponds a maximum possible emission of 47 dBM which is equal to 50 Watts! That is very well one target to the maximum output power a cellular tower can provide. However, cell phones are certainly not always transmitting at full power, it depends on the radio characteristics of the environment they are in and what they are doing.

    As AQ_OC points out, the shared frequency is really the issue here, not so much the transmit power. In addition to that, passive intermodulation would have to be taken into account. That is, many mobiles on a different frequency can cause harmonics in another frequency that might cause interference. Turn your dang phone off when they tell you to, because they do have good reasons. Not all are based on possible interference but some are.
     
  5. Mesqueunclub

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    My own view is that there are far more important issues to address than the use of iPads and other electronic devices during take off and landing. Surely it is not much to ask that passengers obey the rules (big ask). Soon we will be asking to light up during take off and landing! I know this is probably an unpopular view with 'the freedom for use of electronic devices on aircraft and the like' but what is the big deal, seriously? AQ is spot on with his comments.
     
  6. Sonicrobby

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    Two words, Tenerife disaster. While it may not have been caused by passengers electronics, it happened because of interference with the tower and a planes communication. Because airlines don't take a list of electronics you have and research what kind of frequency or waves it emits, it's just safer to say disable all electronics for 5 minutes when communication is crucial for takeoff and landings.
     
  7. seneca18

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    I have never flown the "big boys", but as a pilot of smaller aircraft ranging from a Cessna 172 to a larger twin engine Piper Seneca (thus my handle tag) the only thing I have ever noticed with cell phones interfering with anything is when I received a call while in flight, there would be an obnoxious buzzing over the headset. Nothing major and there are very different regulations for general aviation versus commercial carrier operations. My 2 pennies worth. :)
     
  8. KevinJS

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    I can't believe the fuss over five minutes without electronics when you damned near have to submit to a body cavity search before boarding. There are bigger fish to fry here. The senator might have her heart in the right place, but working on relaxing the near prison camp mentality surrounding airports would be a better use of time, IMO.

    Sent from my stock iPad 2
     
  9. fb si

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    Actually, the main cause of the Tenerife crash was dense fog.
     
  10. Sonicrobby

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    It was a factor, but communication disruption between the tower and the plane ready to take off resulted in the plane taking off before it should've
     

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