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Turbulence Triggers Roll Upset, Stall

Challenger 604

The following information provides an awareness of problems that might be avoided in the future. The information is based on final reports by official investigative authorities on aircraft accidents and incidents.


Jets

Thrust Increase Caused Pitch-Up

Boeing 737-300. No damage. No injuries.

A rapid and slightly asymmetric increase in thrust during an encounter with turbulence while the 737 was in a low-speed turn led to a roll upset and a stall on approach to Antalya, Turkey, the morning of May 2, 2009, according to the French Bureau d’Enquêtes et d’Analyses (BEA).

The incident occurred during a flight with 110 passengers and five crewmembers from Marseille, France. The copilot was the pilot flying.

After nearly three hours en route, the flight crew began the descent from cruise altitude at 0655 coordinated universal time (0955 Antalya time). The 737 was over a “broken layer of cumul…

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