On whether rules against Kindle-reading, or using your digital camera or wearing your noise-cancelling headphones, on takeoff and landing make sense, a few recent additions from reader mail:
Maybe we need to be more worried:
I agree with you. Maybe phones need to be off but certainly not Kindles, ipads, or other non-transmitting devices.
I rather hope, though, that phones don't make a difference. Otherwise what's to prevent a few terrorist-wannabes from just turning on their phones while sitting in first class? Seriously, if all it takes to crash a plane is turning on a phone then why does anyone fly?
It's fascinating to me that the pilot who is also an electrical engineer offered no electrical engineering rationale for the rules. In example one the issue apparently is distraction of the pilot, not electrical interference; in example two we are asked to just trust him because he "can't prove the AM radio caused it, but I know it did." An AM radio receiving radio waves that flood the plane whether or not the radio is on caused the interference? Give me a break!
Three excerpts from your readers' comments about RF and aviation take me back 41 years, conceivably relevantly:
* "I can't prove the AM radio caused it, but I know it did."
* "[T]he impact of PED's - primarily mobile phones - on the RF environment is decidedly non-trivial."
* "Is there any real science behind this ban?"
In 1970, en route to a weapons department assignment on the carrier America off Vietnam, I attended a three-week course at the Norfolk Naval Air Station called "HERO" -- Hazards of Electromagnetic Radiation to Ordnance. Even after four decades, it's easy to recite the take-home (the take-to-sea?) that the Navy taught: "No one really understands the practical complexities of electromagnetic radiation, so when it comes to a flight deck full of electronics and live ordnance, for heaven's sake be as careful as you can be." Question: Even now, in 2011, do physicists and engineers know for certain that stray transmissions can't cause problems in a complex electronic environment?
It can't hurt to be 'situationally aware':
1. The "if it has an on/off" switch distinction makes clear how ridiculous this all is. With the wi-fi turned off, a digital watch or a hearing aid will emit as much as a Kindle, and they don't insist you take the batteries out of those. Why is "on/off switch" the relevant criterion? For that matter, I could fill my entire checked suitcase with bluetooth, wi-fi, and 3G devices transmitting away and no one would care. Shouldn't we have RF detectors in the cargo holds if this is a real issue?
2. I'm a GPS geek, and some airlines are ridiculously touchy about them. Most US carriers are fine with GPS use (other than takeoff/landing). Some prohibit them if you check the fine print in the PED list. Alaska/Horizon actually announces the ban on GPS in their cabin demo, to the point of saying GPS use is prohibited _while at the gate / door open_. I've had AS flight attendants make a big deal about it when "caught", even worried they would confisicate my Garmin once. I'm guessing some security genius at AS concluded the only reason a pax would want to know where they are would be so they could hijack the flight. I'd feel better if they at least admitted that paranoia instead of couching it as "interference with navigational systems".
3. I'm not sure the "shut them off and pay attention" reason is all that bad (though honest would be better!). I do that voluntarily. I like to think I'm not a nervous flyer, I love flying in fact, but I do try to keep situational awareness during takeoff and landing on airliners: put reading in the seat pocket, and be aware of what's going on and anything out of the ordinary. Then once thru V2/wheels up or turned onto a taxiway, go back to whatever I was doing. I guess I imagine that if someday my flight were to land long at MDW and blow past the 1000 feet marker at high speed, knowing to brace myself wouldn't be a bad thing. I'm surprised actually that so many FAs don't do that and just chat or read with 0% of their attention outside the airplane during those short but critical phases.
And after the jump, when will the air travel industry as a whole stop treating us like idiots?