snip....A San Francisco airport spokesman said a component of the airport's instrument landing system that tracks an incoming aeroplane's glide path has been out of service in recent weeks and was not operational on Saturday. Pilots and air safety experts said the glide path technology was far from essential for a safe landing in good weather. But Chesley "Sully" Sullenberger, a retired pilot and safety consultant who gained fame for landing a plane safely in the Hudson river in 2009, said investigators would certainly be looking into the issue. "The pilots would have had to rely solely on visual cues to fly the proper glide path to the runway, and not have had available to them the electronic information that they typically have even in good weather at most major airports," he told a local TV news channel....snip
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