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Dave, try these:
Boeing has investigated alleged interference from portable electronic devices (PEDs) and concluded: "As a result of these and other investigations, Boeing has not been able to find a definite correlation between PEDs and the associated reported airplane anomalies." You can look this up at: http://www.boeing.com/commercial/aer..._textonly.html Aero 10 - Interference from Electronic Devices Here's another one: http://www.rvs.uni-bielefeld.de/publ...ticle/EMI.html Electromagnetic interference with aircraft systems Dave Bushong wrote: Lots of data, not much information. No cites given. Angry crap. Some Guy wrote: Dave Bushong wrote: [Dramatic generalization mode on] Nearly all aircraft accidents are caused by a series of unlikely events all happening together, none of which by itself would be a problem. [Dramatic generalization mode off] Nice sweeping piece of dis-information there buddy. How about this: Nearly all aircraft accidents are caused by a single failure in a single component or a single failure to do something. Pitot tubes that are taped over. Fuel tanks that explode. Structural failure that causes entire pieces of fuselage to peel off while in flight. Fuel leaks that turn large jets into gliders. Cabin fires caused by the overload of a single wire powering the entertainment system. Air pressure equalization valves that bleed cabin air rendering the occupants unconscious and results in a ghost plane flying thousands of miles before crashing. Failure to de-ice. Overloading resulting in stalling upon take-off. Failure to secure cargo upon takeoff. Being struck in the fuel tank by a piece of debris on the runway kicked up by the tires. An engine ingesting a flock of birds. A shipment of improperly-disarmed oxygen generators placed in the cargo hold. Lack of proper lubrication of tail jack-screws. Tail fins that are not as strongly connected to the fuselage as they should be. Need I continue? A series of events will surely happen AFTER any of those incidents, none of which are either unlikely or unexpected, and by and large would have no effect on the outcome. Will the in-flight use of an FM radio EVER cause a plane to run out of fuel? Or cause a sudden ice build-up on the wings? Or blow out a tire upon landing? Or an overload of the electrical system leading to a fire? Will the feeble RF emitted by the LO even be detectable OUTSIDE the plane, where the plane's antennas are located? If you read the various documents on the web relating to issues of in-flight use of PED's (personal electronic devices) it's clear that 1) The FAA and NTSB are either negligent or a bunch of cowards for not forcing the AIRCRAFT MANUFACTURERS to determine the level of susceptibility of their planes to PED's. Instead the issue is pawned off to the aircraft operators when logically it should be the airplane makers! 2) The use of cell phones (analog and perhaps more frequently GSM) seems to have the most influence of any PED. The next most frequent culprit seems to be laptop computers. 3) No incidence of communication failure or disruption seems to have ever been documented by a passenger's FM radio receiver. 4) MANY MANY incidences of navigation equipment errors caused by improper installation / connection of the equipment, or interference caused by one of the plane's other systems where these were first attributed to a PED. 5) Planes have to fly near high-power commercial radio and TV transmission towers. They fly through the beams of powerful radar signals. They get struck by lightning. There are those that say that for a (commercial jet) to be certified there is no way that a certified plane could be susceptible to the stray RF given off by PED's (at least PED's that are non-intentional radiators). 6) The authorities would probably not admit it, but the ban or restrictions on PED use in planes probably has more to do with insurance/liability reasons, or passenger distraction reasons, than it does for technical (interference) reasons. PED's are here to stay. There will be more of them, and people will use them wherever they are. It makes just as much sense to ban them or perform half-ass on-board supervision on a plane for these devices as it is to ban them from cars. PED's used cars cause injury and death each year (due to driver in-attention). Instead of banning radios, phones, and entertainment systems in cars, they instead come from the factory with them installed! Where's your crusade against that situation? Where are your dire warnings here? Would you want to add one more "unlikely event" to your next flight? Nothing caused by or brought on board by a passenger (short of alcohol, a gun, a bomb, or otherwise a strong intent to do harm) will or has ever caused anything bad to happen on a plane or to a plane. No gun ever brought on board (and there have been MANY!) has ever discharged. No can of hairspray has ever exploded in the cargo hold. There is relatively little variety in the types, makes or models of commercial airplanes flying today. There is a high degree of uniformity in construction of these vehicles. There have been millions of flights over the past, say 20 years. There have been many hundred million passengers carried by these planes. There surely has been ample opportunity for all sorts of PED's to be used on these planes (surreptitiously or with consent). If any particular plane model (or even specific plane) had a systemic or inherent susceptibility to a PED, it would have been recognized by now. |
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"chuck" wrote in message nk.net... Dave, try these: Boeing has investigated alleged interference from portable electronic devices (PEDs) and concluded: "As a result of these and other investigations, Boeing has not been able to find a definite correlation between PEDs and the associated reported airplane anomalies." You can look this up at: http://www.boeing.com/commercial/aer..._textonly.html Aero 10 - Interference from Electronic Devices Here's another one: http://www.rvs.uni-bielefeld.de/publ...ticle/EMI.html Electromagnetic interference with aircraft systems Not to cast aspersions on Boeing research, as they are quite reputable, but if they had found correlatable evidence of PED's interfering with avionics, who gets sued? The passenger, a Hong Kong radio manufacturer, or the aircraft builder? In any case, the reports of interference keep coming in, despite the difficulty of replicating the problem. Obviously, the problem is rare and elusive, but, as in most Electromagnetic Compatibility issues, the easiest, surest, and cheapest cure is to control the source of the problem. Just turn off ALL passenger electronics for the duration of the flight. Read a book for 2 hours, and let your kid kick the seat in front of him. Ed wb6wsn Ed wb6wsn |
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