First Cellphone Use On Airplane Given OK

s31523 writes "With over 1 billion cell phone users worldwide, and with so many business travelers, using the cell phone on the airplane has been a recent hot topic. Emirate airlines is announcing they will give the OK for cell phone use on their planes, making them the first airline to do so. The FCC and FAA still ban the use, but are working to determine safety implications, if any."

Comments

Issues are technical, not just regulatory

[bugnuts]

Let's ignore the issues of cellphones interfering with the flight controls. We'll ignore that search for a random cellphone on some oriental airline long ago, purported to be messing up the landing.

From what I understand, cellphones work by associating themselves with "cells" of coverage. The closer they are, the less power they use, and so on. When the user moves cells, the network switches them over to the new cell.

From the air, a cellphone will see many, many different cells as being equally good. It will also have to switch across cells much faster than normal. Without the plane itself acting as a roving cell tower for the occupants, it seems to me that this would cause a lot of problems. Not only will all the cellphones be transmitting at full power, but the network will potentially have to handle many many more switches cell to cell, and faster than normal. There's evidence of this from TFA when it said some upscale, long-haul airlines are installing equipment onboard that will allow for cell phone use.

I'd love to hear from anyone in the business that could shed more light on these technical issues, and whether they are as big of a problem as I suspect if airlines were to just say "Sure! Use your phone!"

Re:Issues are technical, not just regulatory

[TheRaven64]

With a cell site in the plane, your phone will go into low power mode and just talk to it, not any of the towers on the ground (in theory, at least). It may see other towers, but won't try to switch to them, because they will be weaker signals than the one a few metres away.

The cell in the plane will communicate with a base station somewhere, probably via LEO satellites, without interacting with the rest of the phone network. Once the call reaches the ground, it will be routed accordingly. Equipment for the second part (getting the calls to the ground) is already in many planes for the phones you will find built into seats. The only difference is that now you can pay a lot to use your own handset, instead of theirs.

Re:Good news for Bose

[devilspgd]

Actually, they don't do a fantastic job of blocking voices. In my experience it's actually easier to hear conversations using noise canceling headphones then without, since the headphones cancel out the other background noise.

Not exactly news, but CNN thinks so

[eggboard]

Emirates said months ago that they were going to add this service, which uses an on-board picocell and relays calls very expensively very satellite. Should run at least US$2.50 per minute for calls. I wrote about this in The Economist back in September (not Emirates news): RyanAir will launch in-flight calling by the second half of 2007 on hundreds of its planes. That will be the first major deployment.

Re:Cellphones don't endanger planes.

[bananaendian]

Your prior post is interesting, detailed, and well-informed reading, but you fail to address an existing, published study stating that cellphone use on aircraft may be dangerous.

I'll address this again then.

The study says there is an 'increased risk', 'higher than was previously thought'. What they did, was find that more often than thought before people's cellphones were on during critical parts of flights. They also found that laptop wifi and bluetooth were emitting RF. All they actually did was log the spectrum from these emissions on some flights. That is all their research found.

Now, what they imply is that this is somehow more significantly dangerous then we previouly thought. My essay I think covered most of the things why this is not so dangerous.

However I want to stress here the fact that any potential emissions from consumer RF-devices in the cabin will have a hard time competing with all the structures and shielding between the device and the antenna outside the aircraft or inside in the avionics bay. And no such device can dream of competing the awesome power of the spectrum from a fairly common natural sources, such as static build-up and lightning, under which such avionics have to perform on a daily basis.

And if people are already leaving their cellphones and laptops on during flights by accident, where's the harm in allowing them to use them during flights in a controlled and tested environment. This might actually help people remember to turn them off more often during takeoffs and landings.