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Old 27th Jul 2018, 14:41
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extricate
 
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MACH or IAS?
Hi there,

Let's say you requested for a 2000ft descent from FL370 to FL350 due turbulence, you want to do a controlled rate of descent and so you elected to use V/S. Usually with V/S, speed window will be opened, do you keep it at Mach or IAS?

My thought process is, going by the Mach = TAS/speed of sound formula, I'll elect to target IAS so as not to exceed MMO. What's your thoughts?

Thanks in advance.
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