In “Green Machine” (AW&ST Oct. 8, p. 40), it seems Boeing is late to the adaptive trailing edges (ATE) party, as is Airbus. ATEs were introduced in the early 1970s by German high-performance glider manufacturers Alexander Schleicher and Schempp-Hirth. Negative flap setting allowed the pilot—at high penetration speeds—to lose less altitude because negative settings raised the nose of the airplane, thus also losing less altitude. Sandpoint, Idaho


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