Aviation: Instrument Misguidance?

Of ten airplane mishaps presently under investigation by the National Transportation Safety Board, no fewer than six involve liners that crashed on approach to an airport. That is a considerably higher figure than the world wide incidence rate of 47%, and it has caused fresh alarm on the part of air safety experts about the adequacy of instrument-landing equipment at U.S. airports. Bad weather—or weather that required instrument landings—was a factor in at least four of the six approach crashes, and safety experts point out that less than a third of the nation's 623 commercial airports have full instrument-landing...