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One of two sensors that measures the angle of attack is pictured at bottom on a Boeing 737 MAX 8 airplane outside the company's factory: Boeing appears to have ignored the vital rule of redundancy.
Stephen Brashear / Getty Images / AFP

One of two sensors that measures the angle of attack is pictured at bottom on a Boeing 737 MAX 8 airplane outside the company's factory: Boeing appears to have ignored the vital rule of redundancy.