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- <text id=93TT1006>
- <title>
- Feb. 22, 1993: Hazards Aloft
- </title>
- <history>
- TIME--The Weekly Newsmagazine--1993
- Feb. 22, 1993 Uncle Bill Wants You
- </history>
- <article>
- <source>Time Magazine</source>
- <hdr>
- TECHNOLOGY, Page 61
- Hazards Aloft
- </hdr>
- <body>
- <p>Could a CD player, a laptop computer or a hand-held video game
- send an airliner off course?
- </p>
- <p>By PHILIP ELMER-DEWITT--With reporting by Jerry Hannifin/Washington
- </p>
- <p> Unless you are born with feathers, flying requires a leap of
- faith. Passengers have to assume, when they strap themselves
- in, that a 500,000-lb. machine hurtling through the air is firmly
- in the pilot's control. That faith was shaken last week by a
- report that a DC-10 coming into New York's Kennedy airport recently
- almost crashed when a passenger in first class turned on his
- portable compact disc player.
- </p>
- <p> The story, first published in TIME, set off what one airline
- called "a tidal wave" of concern. Can jets really be diverted
- from their flight paths by something as small as a battery-powered
- CD player? Or a video-game machine? Or any of a dozen electronic
- gadgets and computers that passengers regularly carry on board?
- </p>
- <p> Farfetched as it may sound, it can't be ruled out. Every electrical
- device creates a certain amount of radiation. Portable phones,
- remote-control toys and other radio transmitters emit signals
- that can carry for miles, and their use on planes has long been
- banned. But most airlines still let passengers use cassette
- players, tape recorders and laptop computers, which make far
- less electromagnetic noise.
- </p>
- <p> Now there is mounting evidence that even these gadgets may be
- putting aircraft at risk. A Walkman-type radio tuned to an FM
- station generates oscillations that can extend 5 ft. to 12 ft.--far enough, in some planes, to reach the navigation equipment
- stowed in and around the cockpit. "With their thick wires and
- vacuum tubes, the old planes probably wouldn't feel a thing,"
- says Bruce Nordwall, avionics editor of Aviation Week & Space
- Technology. "But the low-power circuits in modern aircraft are
- much more susceptible to interference."
- </p>
- <p> Pilots are particularly concerned about interference with the
- circuitry that picks up radio signals from the so-called VOR
- (visual omni-range) network--hundreds of cone-shaped navigation
- beacons scattered across the U.S. Automatic flight-control systems
- depend on clear VOR signals to land planes safely when visibility
- is poor. But some of that VOR equipment has been behaving strangely
- of late, occasionally causing aircraft on autopilot to veer
- sickeningly out of control.
- </p>
- <p> No planes have crashed and no lives have been lost--so far.
- But TIME has obtained a stack of pilot reports linking a series
- of "anomalies" to a wide variety of electronic gadgets, from
- laptop computers to Nintendo Game Boys. In one striking example,
- a plane flying out of Chicago started veering off course while
- its VOR dials dimmed and danced around. When the passenger in
- seat 9-D turned off his laptop, the report states, the "panel
- lights immediately brightened dramatically and all navigation
- aids returned to normal."
- </p>
- <p> The Federal Aviation Administration, pressed by pilots to crack
- down on the gadgets, issued an advisory late last week that
- left it up to the airlines to set their own rules. Delta has
- already expanded its list of forbidden devices to include video
- playback machines and CD players. With the arrival of new "fly-by-wire"
- aircraft, which are heavily computerized and even more vulnerable
- to interference, passengers may have to go back to reading paperbacks
- and watching the in-flight movie.
- </p>
-
- </body>
- </article>
- </text>
-
-