Flight crews encountering a jet stream will experience large wind gradients that can cause aircraft control difficulties. A 13-year-old report by France’s Bureau d’Enquêtes et d’Analyses pour la Sécurité de l’Aviation Civile (BEA) analyzed an incident that aptly illustrates this problem.  The investigation focused on a Boeing 737-500 that was flying from Lyon to Paris. The planned route entered an area of predicted moderate turbulence that ...


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