Old 03-06-2021, 04:27 PM
  #6  
Twin Wasp
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Joined APC: Oct 2007
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I don't think this is necessarily a descend via clearance. They just want you to maintain current Mach till that Mach number exceeds 280 while you are descending. ATC figures you will transition from Mach to airspeed around FL 240. In the OP's example 300 knots is some Mach number so I would maintain current speed at KOZAR. The bottom altitude at EEEZI is FL 240 so there's no descent involved but there is a hard 280 knots at EEEZI so start slowing a few miles prior.
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