Southwest Airlines is beginning to run up against reliability, parts obsolescence and supply challenges with the attitude display indicator (ADI) on the 737 Classic fleet, says Kent Horton, Southwest’s director of engineering. “Right now, the situation is manageable, but we are monitoring it closely as unit availability on the open market shrinks and repair capacity also diminishes,” he says. “At this juncture, we are looking at whether we will need to change suppliers, or purchase ...


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