Why did mobile phones work on airplanes in the US on 11Sept01? - mobile
Why do cell phones work in New York and Pennsylvania on 11Sept01, the anniversary of the end of the last Arab crusade in Europe, and not before or after? The technology for the use of mobile phones on board aircraft is new and even tested the signal must be transferred pushed to have a ground station. So why not in this day and not on other days?
Saturday, February 13, 2010
Mobile Why Did Mobile Phones Work On Airplanes In The US On 11Sept01?
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8 comments:
I can not believe some of the answers here. Someone left his phone during a flight? They do not work easily. If I do fly my own plane to fly thousands of feet above the ground and get close to a city or a road to any signals. While the cell towers have a wide reach, which are intended to achieve, to horizontal and not vertical.
The next time a card, leave your cell phone. See the signal loses signal in 10 minutes and saw no signs until they return to land. The FCC requires that all telephones be carried out because the phones do not tso'd (Service Order), or authorized for use on an airplane. It is very expensive for a TSO, and every cell phone would receiveThus, the FAA, so that cell phones are used in aircraft. Too much work to be activated each phone can be for each transport, the handling of passengers and the other not. In fact, cell phones do not cause interference with navigation, so you leave your phone number and see the next time that happens.
Calls from airplanes on 9 made / 11 was not from mobile phones, made by airphones on the back of the seats on larger planes.
Mobile phones work in the aircraft before and after SEP11. The reason is prompted to turn off the phone is actually in the air, because they work very well.
It is true that there is a small risk of interference with delicate instruments of control and navigation of aircraft, what is even more important in the takeoff and landing. Therefore, we ask that all electronics for takeoff and landing. But if you say in the air: "It is now safe to use the electronic" ... Why is that you can turn around, but the phone?
In the field of mobile phones for communication with mobile phone antennas. At one point, the phone can be used for several rounds. The towers communicate with each otherFor the transmission tower of the call. Now take the phone at 30-40 thousand feet, suddenly the phone even hundreds of towers available. To examine this issue and then remembered that his plane is not with 90 people aboard the single flight. with the potential logistical nightmare extends the powers of the FCC for the skies, and a ban on the use of cell phones on commercial flights.
Note that approximately 40,000 feet of 7 1 / 2 miles, cell towers are often further away, therefore, that to do, and think, not so, this indicates a cell signal does not reach the ground, however.
"While the cell towers have a wide reach, which are intended to achieve horizontal and not vertical.
It is very logical ... Why not just thinner in your barn?
Not that the phone will not work in airplanes, airlines ban the use of these devices during the flight. Mobile phones work in the airplane during the flight, provided that the aircraft is close enough to the ground. However, the phone signals can interfere with electronics in the plane and what is not allowed. Of course 9 / 11, the rules are of secondary importance.
still working the phones in airplanes. The airlines do not use just because of possible interference with navigational and communications equipment for aircraft.
9 / 11 caution, but everyone pays the kidnappings and that no attention to rules and regulations at the time.
It does not work the phones on airplanes are not in May, depending on the height, I can not interfere with navigation. What test it now is a way as not to interfere with aircraft avionics.
My understanding is that satilite phones in the A / C and are working on a plane flight. Mobile phones in general, so that after 10k feet or more.
1) planes were near land, they were 25,000 feet high.
2) I think people figure it was better to ask forgiveness instead of permission at the time.
Which is not really interference with navigation.
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