Originally posted by Broncojohnny
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In a swept wing jet at high altitude we have buffet boundary charts. The rougher the ride(chop) the wing will be closer to stall because of degrade of lift.(boundary layer separation) Your low/high speed convergence(coffin corner) is dependant on several factors, temp(ISA), weight, turbulence, for each specific aircraft.
At high altitude you will notice we request lower just about all the time when it gets rough, this is done because we do not want to increase our stall speed at altitude. Passenger comfort is also a consideration.
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