Boeing has agreed to redesign the rudder system of its 737. The jet's rudder has been studied as the possible cause of two fatal crashes in 1991 and 1994. The Federal Aviation Administration had mandated three changes in the 737 rudder controls earlier, and officials report no rudder problems since they were implemented. The FAA says the latest changes are meant to take what an agency spokeswoman calls an "extremely safe" plane to the "next level of safety." NPR's Mary Ann Akers reports.
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